The adhesion of gases, liquids, or dissolved solids onto a surface. It includes adsorptive phenomena of bacteria and viruses onto surfaces as well. ABSORPTION into the substance may follow but not necessarily.
Characteristics or attributes of the outer boundaries of objects, including molecules.
A colloidal, hydrated aluminum silicate that swells 12 times its dry size when added to water.
Transparent, tasteless crystals found in nature as agate, amethyst, chalcedony, cristobalite, flint, sand, QUARTZ, and tridymite. The compound is insoluble in water or acids except hydrofluoric acid.
The force acting on the surface of a liquid, tending to minimize the area of the surface. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
Any of the numerous types of clay which contain varying proportions of Al2O3 and SiO2. They are made synthetically by heating aluminum fluoride at 1000-2000 degrees C with silica and water vapor. (From Hawley's Condensed Chemical Dictionary, 11th ed)
Polymerized forms of styrene used as a biocompatible material, especially in dentistry. They are thermoplastic and are used as insulators, for injection molding and casting, as sheets, plates, rods, rigid forms and beads.
An amorphous form of carbon prepared from the incomplete combustion of animal or vegetable matter, e.g., wood. The activated form of charcoal is used in the treatment of poisoning. (Grant & Hackh's Chemical Dictionary, 5th ed)
Agents that modify interfacial tension of water; usually substances that have one lipophilic and one hydrophilic group in the molecule; includes soaps, detergents, emulsifiers, dispersing and wetting agents, and several groups of antiseptics.
A group of compounds with the general formula M10(PO4)6(OH)2, where M is barium, strontium, or calcium. The compounds are the principal mineral in phosphorite deposits, biological tissue, human bones, and teeth. They are also used as an anticaking agent and polymer catalysts. (Grant & Hackh's Chemical Dictionary, 5th ed)
Hard, amorphous, brittle, inorganic, usually transparent, polymerous silicate of basic oxides, usually potassium or sodium. It is used in the form of hard sheets, vessels, tubing, fibers, ceramics, beads, etc.
Artificially produced membranes, such as semipermeable membranes used in artificial kidney dialysis (RENAL DIALYSIS), monomolecular and bimolecular membranes used as models to simulate biological CELL MEMBRANES. These membranes are also used in the process of GUIDED TISSUE REGENERATION.
Viruses whose hosts are bacterial cells.
Process by which unwanted microbial, plant or animal materials or organisms accumulate on man-made surfaces.
The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH = log 1/2[1/(H+)], where (H+) is the hydrogen ion concentration in gram equivalents per liter of solution. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
The mixture of gases present in the earth's atmosphere consisting of oxygen, nitrogen, carbon dioxide, and small amounts of other gases.
A clear, odorless, tasteless liquid that is essential for most animal and plant life and is an excellent solvent for many substances. The chemical formula is hydrogen oxide (H2O). (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
The homogeneous mixtures formed by the mixing of a solid, liquid, or gaseous substance (solute) with a liquid (the solvent), from which the dissolved substances can be recovered by physical processes. (From Grant & Hackh's Chemical Dictionary, 5th ed)
Serum albumin from cows, commonly used in in vitro biological studies. (From Stedman, 25th ed)
The thermodynamic interaction between a substance and WATER.
The rate dynamics in chemical or physical systems.
Condition of having pores or open spaces. This often refers to bones, bone implants, or bone cements, but can refer to the porous state of any solid substance.
Two-phase systems in which one is uniformly dispersed in another as particles small enough so they cannot be filtered or will not settle out. The dispersing or continuous phase or medium envelops the particles of the discontinuous phase. All three states of matter can form colloids among each other.
Compounds formed by the joining of smaller, usually repeating, units linked by covalent bonds. These compounds often form large macromolecules (e.g., BIOPOLYMERS; PLASTICS).
Any of several processes in which undesirable impurities in water are removed or neutralized; for example, chlorination, filtration, primary treatment, ion exchange, and distillation. It includes treatment of WASTE WATER to provide potable and hygienic water in a controlled or closed environment as well as provision of public drinking water supplies.
The property of objects that determines the direction of heat flow when they are placed in direct thermal contact. The temperature is the energy of microscopic motions (vibrational and translational) of the particles of atoms.
Zeolites. A group of crystalline, hydrated alkali-aluminum silicates. They occur naturally in sedimentary and volcanic rocks, altered basalts, ores, and clay deposits. Some 40 known zeolite minerals and a great number of synthetic zeolites are available commercially. (From Merck Index, 11th ed)
A yellow metallic element with the atomic symbol Au, atomic number 79, and atomic weight 197. It is used in jewelry, goldplating of other metals, as currency, and in dental restoration. Many of its clinical applications, such as ANTIRHEUMATIC AGENTS, are in the form of its salts.
A rigorously mathematical analysis of energy relationships (heat, work, temperature, and equilibrium). It describes systems whose states are determined by thermal parameters, such as temperature, in addition to mechanical and electromagnetic parameters. (From Hawley's Condensed Chemical Dictionary, 12th ed)
The most common mineral of a group of hydrated aluminum silicates, approximately H2Al2Si2O8-H2O. It is prepared for pharmaceutical and medicinal purposes by levigating with water to remove sand, etc. (From Merck Index, 11th ed) The name is derived from Kao-ling (Chinese: "high ridge"), the original site. (From Grant & Hackh's Chemical Dictionary, 5th ed)
Biocompatible materials usually used in dental and bone implants that enhance biologic fixation, thereby increasing the bond strength between the coated material and bone, and minimize possible biological effects that may result from the implant itself.
A polysaccharide with glucose units linked as in CELLOBIOSE. It is the chief constituent of plant fibers, cotton being the purest natural form of the substance. As a raw material, it forms the basis for many derivatives used in chromatography, ion exchange materials, explosives manufacturing, and pharmaceutical preparations.
Theoretical representations that simulate the behavior or activity of chemical processes or phenomena; includes the use of mathematical equations, computers, and other electronic equipment.
A type of scanning probe microscopy in which a probe systematically rides across the surface of a sample being scanned in a raster pattern. The vertical position is recorded as a spring attached to the probe rises and falls in response to peaks and valleys on the surface. These deflections produce a topographic map of the sample.
The use of a quartz crystal microbalance for measuring weights and forces in the micro- to nanogram range. It is used to study the chemical and mechanical properties of thin layers, such as polymer coatings and lipid membranes; and interactions between molecues.
A non-crystalline form of silicon oxide that has absorptive properties. It is commonly used as a desiccating agent and as a stationary phase for CHROMATOGRAPHY. The fully hydrated form of silica gel has distinct properties and is referred to as SILICIC ACID.
Deacetylated CHITIN, a linear polysaccharide of deacetylated beta-1,4-D-glucosamine. It is used in HYDROGEL and to treat WOUNDS.
Cetyltrimethylammonium compounds that have cationic detergent, antiseptic, and disinfectant activities. They are used in pharmaceuticals, foods, and cosmetics as preservatives; on skin, mucous membranes, etc., as antiseptics or cleansers, and also as emulsifiers. These compounds are toxic when used orally due to neuromuscular blockade.
The study of the energy of electrons ejected from matter by the photoelectric effect, i.e., as a direct result of absorption of energy from electromagnetic radiation. As the energies of the electrons are characteristic of a specific element, the measurement of the energy of these electrons is a technique used to determine the chemical composition of surfaces.
Enzymes which are immobilized on or in a variety of water-soluble or water-insoluble matrices with little or no loss of their catalytic activity. Since they can be reused continuously, immobilized enzymes have found wide application in the industrial, medical and research fields.
The mineral component of bones and teeth; it has been used therapeutically as a prosthetic aid and in the prevention and treatment of osteoporosis.
Quartz (SiO2). A glassy or crystalline form of silicon dioxide. Many colored varieties are semiprecious stones. (From Grant & Hackh's Chemical Dictionary, 5th ed)
Specific molecular components of the cell capable of recognizing and interacting with a virus, and which, after binding it, are capable of generating some signal that initiates the chain of events leading to the biological response.
A genus of gram-positive, rod-shaped bacteria whose organisms are nonmotile. Filaments that may be present in certain species are either straight or wavy and may have swollen or clubbed heads.
Substances and drugs that lower the SURFACE TENSION of the mucoid layer lining the PULMONARY ALVEOLI.
Polymers of ETHYLENE OXIDE and water, and their ethers. They vary in consistency from liquid to solid depending on the molecular weight indicated by a number following the name. They are used as SURFACTANTS, dispersing agents, solvents, ointment and suppository bases, vehicles, and tablet excipients. Some specific groups are NONOXYNOLS, OCTOXYNOLS, and POLOXAMERS.
A compound with many biomedical applications: as a gastric antacid, an antiperspirant, in dentifrices, as an emulsifier, as an adjuvant in bacterins and vaccines, in water purification, etc.
The study of chemical changes resulting from electrical action and electrical activity resulting from chemical changes.
A membrane or barrier with micrometer sized pores used for separation purification processes.
The accumulation of an electric charge on a object
An anionic compound that is used as a reagent for determination of potassium, ammonium, rubidium, and cesium ions. It also uncouples oxidative phosphorylation and forms complexes with biological materials, and is used in biological assays.
Compounds similar to hydrocarbons in which a tetravalent silicon atom replaces the carbon atom. They are very reactive, ignite in air, and form useful derivatives.
An allotropic form of carbon that is used in pencils, as a lubricant, and in matches and explosives. It is obtained by mining and its dust can cause lung irritation.
Synthetic or natural materials, other than DRUGS, that are used to replace or repair any body TISSUES or bodily function.
Method for measuring viral infectivity and multiplication in CULTURED CELLS. Clear lysed areas or plaques develop as the VIRAL PARTICLES are released from the infected cells during incubation. With some VIRUSES, the cells are killed by a cytopathic effect; with others, the infected cells are not killed but can be detected by their hemadsorptive ability. Sometimes the plaque cells contain VIRAL ANTIGENS which can be measured by IMMUNOFLUORESCENCE.
A basic enzyme that is present in saliva, tears, egg white, and many animal fluids. It functions as an antibacterial agent. The enzyme catalyzes the hydrolysis of 1,4-beta-linkages between N-acetylmuramic acid and N-acetyl-D-glucosamine residues in peptidoglycan and between N-acetyl-D-glucosamine residues in chitodextrin. EC
A spectroscopic technique in which a range of wavelengths is presented simultaneously with an interferometer and the spectrum is mathematically derived from the pattern thus obtained.
Layers of lipid molecules which are two molecules thick. Bilayer systems are frequently studied as models of biological membranes.
A chemical system that functions to control the levels of specific ions in solution. When the level of hydrogen ion in solution is controlled the system is called a pH buffer.
Chemical compounds which pollute the water of rivers, streams, lakes, the sea, reservoirs, or other bodies of water.
Refuse liquid or waste matter carried off by sewers.
Polymers of high molecular weight which at some stage are capable of being molded and then harden to form useful components.
Extracorporeal ULTRAFILTRATION technique without HEMODIALYSIS for treatment of fluid overload and electrolyte disturbances affecting renal, cardiac, or pulmonary function.
An atom or group of atoms that have a positive or negative electric charge due to a gain (negative charge) or loss (positive charge) of one or more electrons. Atoms with a positive charge are known as CATIONS; those with a negative charge are ANIONS.
Derivatives of phosphatidic acids in which the phosphoric acid is bound in ester linkage to a choline moiety. Complete hydrolysis yields 1 mole of glycerol, phosphoric acid and choline and 2 moles of fatty acids.
A form of SILICON DIOXIDE composed of skeletons of prehistoric aquatic plants which is used for its ABSORPTION quality, taking up 1.5-4 times its weight in water. The microscopic sharp edges are useful for insect control but can also be an inhalation hazard. It has been used in baked goods and animal feed. Kieselguhr is German for flint + earthy sediment.

Characterization of human bactericidal antibodies to Bordetella pertussis. (1/3424)

The Bordetella pertussis BrkA protein protects against the bactericidal activity of complement and antibody; however, some individuals mount an immune response that overcomes this bacterial defense. To further characterize this process, the bactericidal activities of sera from 13 adults with different modes of exposure to B. pertussis (infected as adults, occupational exposure, immunized with an acellular vaccine, or no identified exposure) against a wild-type strain and a BrkA complement-sensitive mutant were evaluated. All of the sera killed the BrkA mutant, suggesting past exposure to B. pertussis or cross-reactive organisms. Several samples had no or minimal activity against the wild type. All of the sera collected from the infected and occupationally exposed individuals but not all of the sera from vaccinated individuals had bactericidal activity against the wild-type strain, suggesting that some types of exposure can induce an immune response that can overcome the BrkA resistance mechanism. Adsorbing serum with the wild-type strain removed the bactericidal antibodies; however, adsorbing the serum with a lipopolysaccharide (LPS) mutant or an avirulent (bvg mutant) strain did not always result in loss of bactericidal activity, suggesting that antibodies to either LPS or bvg-regulated proteins could be bactericidal. All the samples, including those that lacked bactericidal activity, contained antibodies that recognized the LPS of B. pertussis. Bactericidal activity correlated best with the presence of the immunoglobulin G3 (IgG3) antibodies to LPS, the IgG subtype that is most effective at fixing complement.  (+info)

Surface-induced polymerization of actin. (2/3424)

Living cells contain a very large amount of membrane surface area, which potentially influences the direction, the kinetics, and the localization of biochemical reactions. This paper quantitatively evaluates the possibility that a lipid monolayer can adsorb actin from a nonpolymerizing solution, induce its polymerization, and form a 2D network of individual actin filaments, in conditions that forbid bulk polymerization. G- and F-actin solutions were studied beneath saturated Langmuir monolayers containing phosphatidylcholine (PC, neutral) and stearylamine (SA, a positively charged surfactant) at PC:SA = 3:1 molar ratio. Ellipsometry, tensiometry, shear elastic measurements, electron microscopy, and dark-field light microscopy were used to characterize the adsorption kinetics and the interfacial polymerization of actin. In all cases studied, actin follows a monoexponential reaction-limited adsorption with similar time constants (approximately 10(3) s). At a longer time scale the shear elasticity of the monomeric actin adsorbate increases only in the presence of lipids, to a 2D shear elastic modulus of mu approximately 30 mN/m, indicating the formation of a structure coupled to the monolayer. Electron microscopy shows the formation of a 2D network of actin filaments at the PC:SA surface, and several arguments strongly suggest that this network is indeed causing the observed elasticity. Adsorption of F-actin to PC:SA leads more quickly to a slightly more rigid interface with a modulus of mu approximately 50 mN/m.  (+info)

Bacteriophage inactivation at the air-water-solid interface in dynamic batch systems. (3/3424)

Bacteriophages have been widely used as surrogates for human enteric viruses in many studies on virus transport and fate. In this investigation, the fates of three bacteriophages, MS2, R17, and phiX174, were studied in a series of dynamic batch experiments. Both MS2 and R17 readily underwent inactivation in batch experiments where solutions of each phage were percolated through tubes packed with varying ratios of glass and Teflon beads. MS2 and R17 inactivation was the result of exposure to destructive forces at the dynamic air-water-solid interface. phiX174, however, did not undergo inactivation in similar studies, suggesting that this phage does not accumulate at air-water interfaces or is not affected by interfacial forces in the same manner. Other batch experiments showed that MS2 and R17 were increasingly inactivated during mixing in polypropylene tubes as the ionic strength of the solution was raised (phiX174 was not affected). By the addition of Tween 80 to suspensions of MS2 and R17, phage inactivation was prevented. Our data suggest that viral inactivation in simple dynamic batch experiments is dependent upon (i) the presence of a dynamic air-water-solid interface (where the solid is a hydrophobic surface), (ii) the ionic strength of the solution, (iii) the concentration of surface active compounds in the solution, and (iv) the type of virus used.  (+info)

Evidence that the neck appendages are adsorption organelles in Bacillus subtilis bacteriophage phi29. (4/3424)

A mutant of Bacillus subtilis unable to adsorb phage phi29 efficiently has been isolated. This mutant can be infected by host range mutants of the phage. Since the host range mutations map in cistron 12, which codes for neck appendage protein, this would tend to confirm that these organelles are involved in viral adsorption.  (+info)

Modulation of cell proliferation and differentiation through substrate-dependent changes in fibronectin conformation. (5/3424)

Integrin-mediated cell adhesion to extracellular matrices provides signals essential for cell cycle progression and differentiation. We demonstrate that substrate-dependent changes in the conformation of adsorbed fibronectin (Fn) modulated integrin binding and controlled switching between proliferation and differentiation. Adsorption of Fn onto bacterial polystyrene (B), tissue culture polystyrene (T), and collagen (C) resulted in differences in Fn conformation as indicated by antibody binding. Using a biochemical method to quantify bound integrins in cultured cells, we found that differences in Fn conformation altered the quantity of bound alpha5 and beta1 integrin subunits but not alphav or beta3. C2C12 myoblasts grown on these Fn-coated substrates proliferated to different levels (B > T > C). Immunostaining for muscle-specific myosin revealed minimal differentiation on B, significant levels on T, and extensive differentiation on C. Differentiation required binding to the RGD cell binding site in Fn and was blocked by antibodies specific for this site. Switching between proliferation and differentiation was controlled by the levels of alpha5beta1 integrin bound to Fn, and differentiation was inhibited by anti-alpha5, but not anti-alphav, antibodies, suggesting distinct integrin-mediated signaling pathways. Control of cell proliferation and differentiation through conformational changes in extracellular matrix proteins represents a versatile mechanism to elicit specific cellular responses for biological and biotechnological applications.  (+info)

Amino acid substitutions in a conserved region in the stalk of the Newcastle disease virus HN glycoprotein spike impair its neuraminidase activity in the globular domain. (6/3424)

The ectodomain of the paramyxovirus haemagglutinin-neuraminidase (HN) glycoprotein spike can be divided into two regions: a membrane-proximal, stalk-like structure and a terminal globular domain. The latter contains all the antibody recognition sites of the protein, as well as its receptor recognition and neuraminidase (NA) active sites. These two activities of the protein can be separated by monoclonal antibody functional inhibition studies and mutations in the globular domain. Herein, we show that mutation of several conserved residues in the stalk of the Newcastle disease virus HN protein markedly decrease its NA activity without a significant effect on receptor recognition. Thus, mutations in the stalk, distant from the NA active site in the globular domain, can also separate attachment and NA. These results add to an increasing body of evidence that the NA activity of this protein is dependent on an intact stalk structure.  (+info)

Differential mechanisms of retinoid transfer from cellular retinol binding proteins types I and II to phospholipid membranes. (7/3424)

Cellular retinol-binding proteins types I and II (CRBP-I and CRBP-II) are known to differentially facilitate retinoid metabolism by several membrane-associated enzymes. The mechanism of ligand transfer to phospholipid small unilamellar vesicles was compared in order to determine whether differences in ligand trafficking properties could underlie these functional differences. Unidirectional transfer of retinol from the CRBPs to membranes was monitored by following the increase in intrinsic protein fluorescence that occurs upon ligand dissociation. The results showed that ligand transfer of retinol from CRBP-I was >5-fold faster than transfer from CRBP-II. For both proteins, transfer of the other naturally occurring retinoid, retinaldehyde, was 4-5-fold faster than transfer of retinol. Rates of ligand transfer from CRBP-I to small unilamellar vesicles increased with increasing concentration of acceptor membrane and with the incorporation of the anionic lipids cardiolipin or phosphatidylserine into membranes. In contrast, transfer from CRBP-II was unaffected by either membrane concentration or composition. Preincubation of anionic vesicles with CRBP-I was able to prevent cytochrome c, a peripheral membrane protein, from binding, whereas CRBP-II was ineffective. In addition, monolayer exclusion experiments demonstrated differences in the rate and magnitude of the CRBP interactions with phospholipid membranes. These results suggest that the mechanisms of ligand transfer from CRBP-I and CRBP-II to membranes are markedly different as follows: transfer from CRBP-I may involve and require effective collisional interactions with membranes, whereas a diffusional process primarily mediates transfer from CRBP-II. These differences may help account for their distinct functional roles in the modulation of intracellular retinoid metabolism.  (+info)

Lysozyme sorption in hydrogel contact lenses. (8/3424)

PURPOSE: To examine the processes involved in formation of protein deposits on hydrogel contact lenses. METHODS: The adsorption and/or penetration of lysozyme on or into three types of contact lenses, etafilcon A, vifilcon A, and tefilcon, were investigated in vitro using a radiolabel-tracer technique, x-ray photoelectron spectroscopy, and laser scanning confocal microscopy. RESULTS: Binding of lysozyme to high-water-content, ionic contact lenses (etafilcon A and vifilcon A) was dominated by a penetration process. The extent of this penetration was a function of charge density of the lenses, so that there was a higher degree of penetration of lysozyme in etafilcon A than in vifilcon A lenses. In contrast, the binding of lysozyme to tefilcon lenses was a surface adsorption process. The adsorption and desorption kinetics showed similar trends to those found in human serum albumin (HSA) adsorption on lens surfaces. However, the extent of lysozyme adsorption on tefilcon is much higher than HSA adsorption, probably because of the self-association of lysozyme on the tefilcon lens surface. Furthermore, either penetration or adsorption of lysozyme involved reversible and irreversible processes and were both time dependent. CONCLUSIONS: Binding of lysozyme to hydrogel lenses involves surface adsorption or matrix penetration. These processes may be reversible or irreversible. The properties of the lens materials, such as charge density (ionicity) and porosity (water content) of the lenses, determine the type and rates of these processes.  (+info)

Langmuir Adsorption Isotherm calculators give you a List of Langmuir Adsorption Isotherm Calculators. A tool perform calculations on the concepts and applications into Langmuir Adsorption Isotherm.
This paper presents the adsorption properties of the o-Al13Co4(100) surface toward molecules involved in the semihydrogenation of acetylene. The energetically favored adsorption sites of H, C2H2, C2H3, and C2H4 are determined thanks to ab initio density functional calculations. The surface model used for this study has been determined previously [Phys. Rev. B 2011, 84, 085411], using an approach combining both experimental observations and density functional theory calculations. We show that although the surface termination layer of o-Al13Co4(100) is a dense Al-rich layer, its adsorption properties are quite different from pure elemental Al surfaces, especially for atomic hydrogen adsorption (exothermic on o-Al13Co4(100) and endothermic on low index Al surfaces). The role of surface and subsurface cobalt atoms is investigated carefully. The electronic donor/acceptor character of subsurface cobalt atoms is shown to influence the adsorption properties. In particular, the subsurface cobalt atoms have a
TY - JOUR. T1 - Protein Adsorption on Grafted Zwitterionic Polymers Depends on Chain Density and Molecular Weight. AU - Ahmed, Syeda Tajin. AU - Leckband, Deborah E.. PY - 2020/7/1. Y1 - 2020/7/1. N2 - This study demonstrates that protein adsorption on end-grafted, zwitterionic poly(sulfobetaine) (pSBMA) thin films depends on the grafting density, molecular weight, and ionic strength. Zwitterionic polymers exhibit ultralow nonspecific fouling (protein adsorption) and excellent biocompatibility. This picture contrasts with a recent report that soluble pSBMA chains bind proteins and alter the protein folding stability. To address this apparent contradiction, the dependence of protein adsorption on the chain grafting parameters is investigated: namely, the grafting density, molecular weight, and ionic strength. Studies compared the adsorption of phosphoglycerate kinase and positively charged lysozyme versus the scaled grafting parameter s/2RF, where s is the distance between grafting sites and RF ...
TY - JOUR. T1 - Adsorption properties and behavior of the platinum group metals onto a silica-based (Crea + TOA)/SiO2-P adsorbent from simulated high level liquid waste of PUREX reprocessing. AU - Xu, Yuanlai. AU - Kim, Seong Yun. AU - Ito, Tatsuya. AU - Tada, Tsutomu. AU - Hitomi, Keitaro. AU - Ishii, Keizo. PY - 2013/7/1. Y1 - 2013/7/1. N2 - To separate platinum group metals (PGMs) from high level liquid waste (HLLW), a novel silica-based (Crea + TOA)/SiO2-P adsorbent was synthesized by impregnating Crea (N′,N′-di-n-hexyl- thiodiglycolamide) and TOA (trioctylamine) two extractants into the macroporous SiO2-P support with a mean diameter of 60 μm. Adsorption properties and behavior of PGMs from simulated HLLW onto the novel silica-based (Crea + TOA)/SiO2-P adsorbent were investigated by batch method. It was found that (Crea + TOA)/SiO2-P adsorbent exhibited good adsorption selectivity for PGMs over the other tested fission product element in a wide HNO3 concentration. This adsorbent showed ...
Adsorption capacity is defined as the volume of gas that can be adsorbed per unit mass of coal at standard pressure. Learn about adsorption isotherms calculations, its concept, Freundlich isotherm & its properties along with freundlich adsorption isotherm calculation.
TY - JOUR. T1 - Protein adsorption mechanisms determine the efficiency of thermally controlled cell adhesion on poly(N -isopropyl acrylamide) brushes. AU - Choi, Sangwook. AU - Choi, Byung Chan. AU - Xue, Changying. AU - Leckband, Deborah E. PY - 2013/1/14. Y1 - 2013/1/14. N2 - This study investigated the impact of the protein adsorption mechanism(s) on the efficiency of thermally controlled cell adhesion and release from poly(N-isopropyl acrylamide) brushes. Large format polymer gradients were used to screen for grafting densities and substrate chemistries that alter both cell adhesion at 37 °C and rapid cell release at 25 °C. In particular, the grafting conditions investigated allowed protein adsorption to the underlying substrate, penetration of the brush only, or adsorption to the outer edge of the film. At an average molecular weight of 30 kDa (degree of polymerization N ∼ 270), the results show that robust protein adsorption to polymer brushes impairs rapid cell release below the lower ...
Based upon the adsorbate-adsorbent interactions due to pore size distribution and surface heterogeneity, as characterized by the adsorption isotherms, the adsorption phenomenon has many industrial and environmental applications. These adsorption isotherms are very important to define the information related to the equilibrium uptake of adsorbate-adsorbent pair. Due to the presence of different energy distribution of adsorption sites, pore size distribution, surface area availability and surface heterogeneity, of each of the adsorbent-adsorbate pair, these isotherms are categorized into six types by the International Union of Pure and Applied Chemistry and so far, in the literature, there is no generalized adsorption isotherm model available that can define and predict the behavior of all adsorption isotherm types. In this study, a universal adsorption isotherm model is developed based upon the energy distribution function of the available adsorption sites and the pore size. The proposed model is ...
A new kind of Fe-Si adsorbent was synthesized by iron oxide and diatomite after calcining and hydrothermal process. The influences of the initial Cu2+ concentration, pH and adsorption time on the Cu2+ removal efficiency were discussed. Three adsorption empirical kinetics equations and two thermodynamics equations were used to simulate the adsorption process. The microstructures of newly developed copper removal materials and properties of copper removal are characterized in details by SEM and EDS. Adsorption mechanism of the adsorbent was discussed. The suitable pH value for Cu2+ removal is 5.0 to 6.0 and the adsorption capacity increases with increasing the initial Cu2+ concentration. The adsorption kinetics of the adsorbent could be better described by pseudo second order kinetic model, whereas the adsorption isotherms highly conform to the Freundlich equation. The main crystalline phase of the adsorbent is Fe(SiO3) which can build porous structures conducive to the Cu2+ adsorption ...
TY - JOUR. T1 - Chemistry. T2 - Gas adsorption sites in a large-pore metal-organic framework. AU - Rowsell, Jesse L.C.. AU - Spencer, Elinor C.. AU - Eckert, Juergen. AU - Howard, Judith A.K.. AU - Yaghi, Omar M.. PY - 2005/8/26. Y1 - 2005/8/26. N2 - The primary adsorption sites for Ar and N2 within metal-organic framework-5, a cubic structure composed of Zn4O(CO2) 6 units and phenylene links defining large pores 12 and 15 angstroms in diameter, have been identified by single-crystal x-ray diffraction. Refinement of data collected between 293 and 30 kelvin revealed a total of eight symmetry-independent adsorption sites. Five of these are sites on the zinc oxide unit and the organic link; the remaining three sites form a second layer in the pores. The structural integrity and high symmetry of the framework are retained throughout, with negligible changes resulting from gas adsorption.. AB - The primary adsorption sites for Ar and N2 within metal-organic framework-5, a cubic structure composed of ...
Adsorption characteristics of light gases on basalt rock-based zeolite 4A: The adsorption characteristics of light gases on basalt rock-based zeolite 4A (BR zeo
In the mixing process of concrete, the addition of auxiliary cementitious building materials can improve the performance of concrete while saving resources, but due to the compatibility problem of raw materials, there shall occur poor fluidity and abnormal setting etc. for the early-period concrete. For this, based on the adsorption mechanism of water reducer on auxiliary cementitious building materials, this paper carries out the study on the adsorption characteristics of three kinds of polycarboxylate superplasticizer (PCS) on the surface of fly ash, and solves the problem of relationship between the PC dosage/adsorption capacity and particle size of fly ash. The results show that the PC structure has a significant influence on the adsorption capacity, and its adsorption capacity on the surface of fly ash gradually increases and becomes saturated with the increase of its dosage. This study is of great significance for the selection of water reducer and the dosage application ...
Isotherms, Kinetics and Thermodynamic Parameters Studies of New Fuchsin Dye Adsorption on Granular Activated Carbon dye adsorption;adsorption isotherm;adsorption thermodynamics;adsorption kinetics;adsorption equilibrium; Batch adsorption studies including equilibrium, kinetics and thermodynamic parameters for the adsorption of new fuchsin dye using granular activated carbon were investigated with varying the operating variables such as initial concentration, contact time and temperature. Equilibrium adsorption data were fitted into Langmuir, Freundlich, Dubinin-Radushkevich and Temkin isotherms. Adsorption equilibrium was mostly well described by Langmuir Isotherm. From the estimated separation factor of Langmuir ($R_L$ = 0.023), and Freundlich (1/n = 0.198), this process could be employed as an effective treatment for the adsorption of new fuchsin dye. Also based on the adsorption energy (E = 0.002 kJ/mol) from Dubinin-Radushkevich isotherm and the adsorption heat constant (B = 1.920 J/mol) from
TY - JOUR. T1 - Surface characterization of the TiClx/MgCl2 model Ziegler-Natta polymerization catalysts. T2 - Adsorption site studies using mesitylene thermal desorption. AU - Kim, Seong. AU - Tewell, Craig R.. AU - Somorjai, Gabor A.. PY - 2000/11/28. Y1 - 2000/11/28. N2 - Temperature-programmed desorption (TPD) of physisorbed mesitylene molecules has been used as a nondestructive surface probe to distinguish the surface adsorption sites of model Ziegler-Natta polymerization catalysts. A MgCl2-supported titanium chloride film (TiClx/MgCl2) was fabricated on an inert gold substrate by codeposition of Mg metal and TiCl4 from the gas phase. The mesitylene TPD probe revealed two types of surface adsorption sites. The dominant site was attributed to the basal plane of these halide crystallites. The minor site could be tentatively attributed to a defective structure at the basal plane boundaries or other crystal planes. Due to the chlorine termination nature of the catalyst surface, the metal ions ...
The purpose of this study was to elucidate the characteristics and mechanisms of adsorption and desorption for heavy metals by micro and nano-sized biogenic CaCO3 induced by Bacillus subtilis, and the pH effect on adsorption was investigated. The results showed that the adsorption characteristics of Cd2+ and Pb2+ are well described by the Langmuir adsorption isothermal equation, and the maximum adsorption amounts for Cd2+ and Pb2+ were 94.340 and 416.667 mg/g, respectively. The maximum removal efficiencies were 97% for Cd2+, 100% for Pb2+, and the desorption rate was less than 3%. Further experiments indicated that the biogenic CaCO3 could maintain its high adsorption capability for heavy metals within wide pH ranges (3-8). The FTIR and XRD results showed that, after the biogenic CaCO3 adsorbed Cd2+ or Pb2+, it did not produce a new phase, which indicated that biogenic CaCO3 and heavy metal ions are governed by a physical adsorption process, and the high adsorptive capacity of biogenic CaCO3 for Cd2+
This book provides researchers and graduate students with an overview of the latest developments in and applications of adsorption processes for water treatment and purification. In particular, it covers current topics in connection with the modeling and design of adsorption processes, and the synthesis and application of cost-effective adsorbents for the removal of relevant aquatic pollutants. The book describes recent advances and alternatives to improve the performance and efficacy of this water purification technique. In addition, selected chapters are devoted to discussing the reliable modeling and analysis of adsorption data, which are relevant for real-life applications to industrial effluents and groundwater. Overall, the book equips readers with a general perspective of the potential that adsorption processes hold for the removal of emerging water pollutants. It can readily be adopted as part of special courses on environmental engineering, adsorption and water treatment for upper ...
Discharge of untreated industrial wastewater containing heavy metals such as Pb2+ is hazardous to the environment due to their high toxicity. This study reports on the adsorption, desorption, and kinetic study on Pb2+ removal from aqueous solutions using wood/Nano-manganese oxide composite (WB-NMO). The optimum pH, contact time and temperature for adsorption were found to be 5.0, 4 h and 333 K, respectively. Pseudo-second-order kinetics best described the adsorption process with an initial sorption rate of 4.0 mg g min-1, and a half-adsorption time t1/2 of 31.6 min. Best fit for adsorption isotherm was obtained with the Brunauer-Emmett-Teller (BET) model with a maximum adsorption capacity of 213 mg/g for an initial metal concentration of 60 mg/L. Both intra-particle diffusion and film diffusion contribute to the rate-determining step. Desorption experiments with 0.5 mol/L HCl, inferred the reusability of the composite. Adsorption experiment of Pb2+ from industrial wastewater confirmed that the prepared
The competitive adsorption of toluene and n-alkanes at binary solution/silica interfaces was studied at room temperature using IR-visible sum frequency generation vibrational spectroscopy. The Surface coverage of toluene for toluene-pentane, toluene-heptane, and toluene-tetradecane mixtures was measured over the complete mole fraction range from 0 to 1. The competitive adsorption process was reversible, and the toluene coverage only depended oil the bulk mole fraction, not on the history of the system. The estimated molar adsorption free energy of toluene is 3.4 +/- 0.3, 1.8 +/- 0.3, and 0.84 +/- 0.3 kJ/mol higher than pentane, heptane, and tetradecane, respectively. Overall, toluene competes favorably on silica, and the molar adsorption free energy of alkanes increases as the chain length increases. It is consistent with the observed SFG spectra, indicating that the alkanes lie flat on the silica surface.. ...
J Mater Sci. DOI 10.1007/s10853-014-8333-x. Adsorption characteristics of noble metals on the strongly basic anion exchanger Purolite A-400TL. A. Wolowicz • Z. Hubicki. Received: 14 March 2014/Accepted: 16 May 2014. © The Author(s) 2014. This article is published with open access at Abstract Ion exchange is an alternative process for uptake of noble metals from aqueous solutions. In the present study, the sorption ofPd(II), Pt(IV), and Au(III) ions from aqueous solution was investigated by using Purolite A-400TL (strongly basic anion exchanger, gel, type I) in a batch adsorption system as a function of time (1 min-4 h). Initial Pd(II) concentration (100-1000 mg/L), beads size (0.425-0.85 mm), rate of phases mixing (0-180 rpm), and temperatures (ambient, 313 K) were taken into account during the Pd(II) sorption process. Moreover, the column flow adsorption study was carried out, and the breakthrough curves were obtained for Pd(II) ions. The equilibrium, kinetic, desorption, ...
TY - JOUR. T1 - Effect of transport mechanisms on the irreversible adsorption of large molecules. AU - Bafaluy, F. J.. AU - Choi, H. S.. AU - Senger, B.. AU - Talbot, J.. PY - 1995/1/1. Y1 - 1995/1/1. N2 - We consider one-dimensional models for the irreversible adsorption of large molecules on a solid surface. The study is motivated by recent simulations of the diffusion random sequential adsorption process in which hard spheres diffuse above an adsorbing surface. We first consider a generalized parking process in which the rate of deposition of a particle within a gap formed by two preadsorbed spheres depends on the width of the gap, but is uniform within a gap. We demonstrate simply that all generalized parking processes, including simple random sequential adsorption (RSA), have the same jamming limit coverage. As a by-product of this analysis, we obtain a recursion formula for the saturation coverage in gaps of finite length. In the second part of the paper, we consider a parking process in ...
The adsorption of paracetamol and non-steroidal anti-inflammatory drugs (ibuprofen and naproxen) on ordered mesoporous carbons (OMC) and, for comparison, on commercial activated carbon, were investigated in this work. OMC adsorbents were obtained by the soft-templating method and were characterized by low-temperature nitrogen adsorption and scanning electron microscopy (SEM). The effects of contact time and initial concentration of organic adsorbates on the adsorption were studied. The contact time to reach equilibrium for maximum adsorption was 360 min for all the studied adsorbates. The adsorption mechanism was found to fit pseudo-second-order and intra particle-diffusion models. Freundlich, Langmuir and Langmuir-Freundlich isotherm models were used to analyze equilibrium adsorption data. Based on the obtained experimental data, the adsorption isotherm in the applied concentration range for all the studied adsorbates was well represented by the Freundlich-Langmuir model. The adsorption ability of
The ability of commercial activated carbon to adsorb Pb2+ from aqueous solution has been investigated through batch experiments. The adsorption of lead onto commercial activated carbon has been found to depend on adsorbent dose, initial concentration and contact time. The experiments were carried out at natural solution pH. Equilibrium data fitted well with the Langmuir model and Freundlich model with a maximum adsorption capacity of 23.81 mg of Pb/g of commercial activated carbon. The experiments showed that the highest removal rate was 92.42% for Pb2+ under optimal conditions. The sorption of Pb2+ on commercial activated carbon was rapid during the first 30 min and the equilibrium attained within 60 min. The kinetic processes of Pb2+ adsorption on commercial activated carbon were described by applying pseudo-first-order and pseudo-second-order kinetic models. The kinetic data for the adsorption process obeyed a pseudo-second-order kinetic model, suggesting that the adsorption process is ...
During the last years, the authors have synthesized, characterized, and studied the adsorption properties of nitroprussides, Prussian blue analogues, akaganeites, MeAPOs, metal-organic frameworks, and extremely high specific surface amorphous silica, which allowed the storage of about 11 wt.% of hydrogen in the form of ammonia. In this sense, using the solid-state reaction method, sol-gel methodologies, together with aluminosilicate, high silica and non-aluminosilicate zeolite synthesis methods, were described, moreover was explained how to prepare active carbons along with the synthesis of Prussian blue analogues (PBAs) and nitroprussides (NPs). In addition, the characterization of the materials of interest applying X-ray diffraction, thermogravimetric analysis, DRIFTS, and room-temperature Mossbauer spectrometry was discussed. Besides, the concepts that define physical adsorption and examples of adsorption data, which were tested with the help of the Dubinin, osmotic adsorption and Langmuir-type
Our understanding on how ash particles in volcanic plumes react with coexisting gases and aerosols is still rudimentary, despite the importance of these reactions in influencing the chemistry and dynamics of a plume. In this study, six samples of fine ash (,100 mgrm) from different volcanoes were measured for their specific surface area, as, porosity and water adsorption properties with the aim to provide insights into the capacity of silicate ash particles to react with gases, including water vapour. To do so, we performed high-resolution nitrogen and water vapour adsorption/desorption experiments at 77 K and 303 K, respectively. The nitrogen data indicated as values in the range 1.1-2.1 m2/g, except in one case where a as of 10 m2/g was measured. This high value is attributed to incorporation of hydrothermal phases, such as clay minerals, in the ash surface composition. The data also revealed that the ash samples are essentially non-porous, or have a porosity dominated by macropores with ...
Adsorption properties of layered anionic clay-composites for the removal of anionic dyes from water were studied. The dye adsorption capacities of the composites were higher than the pristine clay. The clay-alginate composite with 5.9% alginate showed highest adsorption for both the dyes. The maximum adsorption capacity of the composite was enhanced by 51% for Acid Green 25 and 160% for Acid Green 27, compared to the pristine layered clay sample. The adsorption isotherm data were fitted to the Langmuir, Freundlich and Temkin isotherm models. The isotherm data could be explained well using the Freundlich isotherm model. Adsorption kinetics was analyzed using normal first order and Lagergren first order kinetic models.
The adsorption characteristics of pure water vapor onto two different types of silica gel at temperatures from (298 to 338) K and at different equilibrium pressures between (500 and 7000) Pa were experimentally studied by a volumetric technique. The thermophysical properties such as the skeletal density, Brunauer-Emmett-Teller surface area, pore size, pore volume, and total porosity of silica gel were determined. The Tóth isotherm model is found to fit all of the experimental data within the experimental errors. The experimental isotherms and the computed enthalpies of adsorption are compared with those of various researchers and found to be consistent with a chiller manufacturers data ...
Adsorption behaviour of Ni(II), Cd(II) and Pb(II) from aqueous solutions by shells of hazelnut and almond were investigated. The structural properties and surface chemistry of the shells were characterized using sorption of nitrogen and Boehm titration. The equilibrium time was found to be 120 min. The equilibrium adsorption capacity of shells were obtained by using linear Langmuir and Freundlich adsorption isotherms. The equilibrium adsorption level was determined to be a function of the solution contact time, concentration and temperature. The thermodynamic parameters have been determined. The negative values of free change (Delta G) indicated the spontaneous nature of the adsorption of Ni(II), Cd(II) and Pb(II) onto shells of hazelnut and almond and the positive values of enthalpy change (Delta H) suggested the endothermic nature of the adsorption process, The best correlation coefficients were obtained for the pseudo second-order kinetic model. Ion exchange is probably one of the major ...
TY - CONF AU - Vidović, Milka AU - Marinković, Dalibor AU - Mladenović, Nikola AU - Krstić, Jelena PY - 2007 UR - AB - The adsorption process are more and more frequently applied in water treatments. The choice of the adsorption medium depends on the adsorption capacity. The adsorption capacity in statical conditions should always preceeds the determination of the adsorption capacity in dynamic conditions, because it represents one of the main indicators of the proper determination of technological parameters in the process of water purification. The aim of this paper is to present a method for determination of specific adsorption capacity according to linear form of Freundlich`s equation and adsorption capacity in accordance with Lengmuir`s equation and its linear form. AB - Adsorpcioni procesi se sve češće primenjuju u tretmanima prečišćavanja vode. Izbor adsorpcionog medijuma zavisi od adsorpcionog kapaciteta. Adsorpcioni kapacitet u ...
In this paper, wool carpet dye adsorption properties of nanoporous activated carbon materials (NCMs) prepared from bamboo agro-product is reported. Bamboo cane powder was chemically activated with phosphoric acid at different temperatures (400, 500, and 600 °C) at an impregnation ratio of 1:1. We found that the specific surface area and the total pore volume of NCM increases with temperature giving the highest surface area and pore volume ca. 2130 m2·g−1 and 2.69 cc·g−1 at 600 °C. Owing to superior surface textural properties, bamboo-derived NCM showed excellent adsorption capacity for wool carpet dyes Lanasyn orange (LO) and Lanasyn gray (LG). The adsorption phenomena could be described by Langmuir/Freundlich adsorption isotherm models. The maximum adsorption capacity was ca. 2.60 × 103 and 3.04 × 103 mg·g−1 for LO and LG, respectively. The adsorption followed pseudo second order kinetics with the second order rate constant of 1.24 × 10−3 g·mg−1·min−1 (LO) and 7.69 × 10−4 g·mg
Aikpokpodion, P.E., Osobamiro, T., Atewolara-Odule, O.C., Oduwole, O.O., Ademola, S.M. Studies on adsorption mechanism and kinetics of magnesium in selected cocoa growing soils in Nigeria. Journal of Chemical and Pharmaceutical Research, vol. 5, p. 128-139, 2013 ...
Background: Effective bimolecular adsorption of proteins onto solid matrices is characterized by in-depth understanding of the biophysical features essential to optimize the adsorption performance, Results: The adsorption of bovine serum albumin (BSA) onto anion-exchange Q-sepharose solid particulate support was investigated in batch adsorption experiments, Adsorption kinetics and isotherms were developed as a function of key industrially relevant parameters such as polymer loading, stirring speed, buffer pH, protein concentration and the state of protein dispersion (solid/aqueous) in order to optimize binding performance and adsorption capacity, Experimental results showed that the first order rate constant is higher at higher stirring speed, higher polymer loading, and under alkaline conditions, with a corresponding increase in equilibrium adsorption capacity, Increasing the stirring speed and using aqueous dispersion protein system increased the adsorption rate, but the maximum protein ...
Due to high biocompatibility and tailorable properties, DNA-based nanostructures are widely studied in biosensor and nanomedicine applications. The restriction for using DNA-based nanostructures lie in the purification processes which have low product yield and tedious steps involved. MoS2 nanosheets are chosen to test for its purification efficiency as MoS2 is shown to have discriminating properties between single stranded DNA and double stranded DNA. Adsorption studies of different DNA nanostructures are tested to see the adsorption capacity of MoS2. From the adsorption studies, it has been observed that MoS2 has high affinity to plasmid DNA, so the use of MoS2 as a gene carrier is tested for its delivery performance ...
Batch adsorption experiments were conducted to investigate equilibrium, kinetic and thermodynamics of the sorption of Methylene Blue onto Fly Ash modified with various concentrations of hydrochloric acid (FAHC-4, FAHC-3, FAHC-2 and FAHC-1). Equilibrium data was best described by the Freundlich isotherm model which suggests adsorbents had heterogeneous surfaces therefore multilayer adsorption occurred in all cases. Fly Ash modified with 1M HCl exhibited the highest adsorption capacity (9.8 mg/L) and Fly Ash modified with 4M HCl had the least adsorption capacity (4.4mg/L). Kinetic data was best described by the pseudo-second-order kinetic model which means adsorption processes were controlled by chemisorption. Boyd kinetic model plots revealed that the rate determining step of each sorption process followed the film diffusion mechanism in which adsorbate ions travelled towards the external surfaces of adsorbents due to electrostatic interactions between chemically modified Fly Ash and adsorbate ...
In this study, a new cellulose-based nano-adsorbent was synthesized using a simple method. The synthesized adsorbent was characterized using FT-IR, FESEM and EDX analyses. Adsorption characteristics of epoxy-triazine-modified cellulose nan-adsorbent were compared with cellulose for the removal of malachite green dye from aqueous media. The effects of surface improvement on the adsorption of organic adsorptive were studied by considering various parameters such as contact time, adsorbent dosage, pH, and temperature. The obtained results indicated that the pseudo-second-order model and Freundlich isotherm model well describe the dye adsorption process on the nano-adsorbent. The maximum adsorption capacity of MG on the nano-adsorbent at 45 ˚C was found to be 49.26 mg/g. Furthermore, the calculated thermodynamic parameters showed that the adsorption process of the MG dye was endothermic and associated with an increase in entropy.
Abstract The adsorption of four substances and their binary mixture is investigated via the terahertz time domain spectroscopy (THz-TDS). The selected unary compound (ethanol, acetone, ethyl acetate, and n-propyl acetate) and binary mixture (solution 1 is composed of ethanol and acetone, and solution 2 is composed of ethyl acetate and n-propyl acetate) exhibit different adsorption behaviors with varied polarities. In comparison with single component, solution 1 shows shorter adsorption equilibrium time, faster adsorption rate, and stronger adsorption capacity, which conform to a synergistic adsorption mechanism, while the competitive behavior is attributed to the slower adsorption in solution 2. In addition, the pseudo-second-order equation with terahertz parameter is used to assess the rate of binary component organics. The present results indicate a further understanding of multicomponent adsorption mechanisms ...
For the first time, we have used a metal oxide-coated quartz crystal microbalance (QCM) to measure Cs+ adsorption onto illuminated and un-illuminated mesoporous TiO2 (m-TiO2) films by microgravimetric means in-situ. In the simplest case, such experiments yield two parameters of interest: K, the Langmuir adsorption coefficient and mmax the maximum mass of adsorbate to form a complete monolayer at the m-TiO2-coated quartz crystal piezoelectric surface. Importantly, we have found that illumination of the m-TiO2 film with ultra bandgap light results in an increase in mmax i.e. illumination allows for greater adsorption of substrate to occur than in the dark. Our studies also show that under illumination, K also increases indicating a higher affinity for surface adsorption. The photoinduced change in mmax and K are thought to be due to an increase in surface bound titanol groups, thus increasing the number of available adsorption sites - and so providing evidence to support the notion of photoinduced ...
TY - JOUR. T1 - Sol-gel synthesis and gas adsorption properties of CuCl modified mesoporous alumina. AU - Wang, Y.. AU - Lin, Y. S.. PY - 1998. Y1 - 1998. M3 - Article. VL - 1. SP - 185. EP - 195. JO - J. Sol-Gel Sci. Tech.. JF - J. Sol-Gel Sci. Tech.. ER - ...
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This thesis presents experimental studies of polyelectrolyte adsorption on oppositely charged surfaces, where substrates of both silica and bleached softwood kraft pulp were used. A major aim of this research was to characterise the conformation of adsorbed layers of cationic polyacrylamide (CPAM), in comparison to cationic dextran (Cdextran), and relate this information to the binding capacity of colloidal silica. A second aim in this thesis was to study the kinetics of the sequential adsorption of polyamide epichlorohydrine (PAE) and carboxymethyl cellulose (CMC) on pulp fibres, and to determine the adsorption isotherms for the layer-by-layer deposition of polyelectrolytes on pulp fibres.. The adsorption of CPAM on silica surfaces was studied using stagnation point adsorption reflectometry and quartz crystal microgravimetry to determine its adsorption kinetics as well as the dependencies of polyelectrolyte charge densities, pH, and NaCl concentration on saturation adsorption. The conformation ...
Read Synthesis, Characterization, and Adsorption Properties of a Graphene Composite Sand (GCS) and Its Application in Remediation of Hg(II) Ions, Water, Air, Soil Pollution on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
Fingerprint Dive into the research topics of Control of interpenetration: Via in situ lithium incorporation in MOFs and their gas adsorption properties and selectivity. Together they form a unique fingerprint. ...
TY - JOUR. T1 - Nanoscale control of layer thickness for EL devices by mass-controlled layer-by-layer sequential adsorption process. AU - Shiratori, Seimei. AU - Yamada, Masayoshi. AU - Ito, Takahiro. AU - Wang, Tom C.. AU - Rubner, Michael F.. PY - 2000/12/1. Y1 - 2000/12/1. N2 - A mass controlled layer-by-layer sequential adsorption process for polyelectrolytes was newly developed for the fabrication of functional devices using ultra-thin organic film formed by various polymers of different polarity of charge. In this study hydrophobic Ruthenium complex monomer (tris(bipyridyl) ruthenium(II) hexafluorophosphate) was micelle-wrapped with an anionic surfactant, sodium dodecylbenzenesulfonate, and was assembled with PAH (poly (allylamine hydrochloride)), which has the opposite charge, on ITO substrates. With this method, we succeeded in fabricating ultra-thin organic films even when the adsorption material is not polymer but monomer. Moreover it was found that the film thickness of the ...
This thesis presents experimental studies of polyelectrolyte adsorption on oppositely charged surfaces, where substrates of both silica and bleached softwood kraft pulp were used. A major aim of this research was to characterise the conformation of adsorbed layers of cationic polyacrylamide (CPAM), in comparison to cationic dextran (Cdextran), and relate this information to the binding capacity of colloidal silica. A second aim in this thesis was to study the kinetics of the sequential adsorption of polyamide epichlorohydrine (PAE) and carboxymethyl cellulose (CMC) on pulp fibres, and to determine the adsorption isotherms for the layer-by-layer deposition of polyelectrolytes on pulp fibres.. The adsorption of CPAM on silica surfaces was studied using stagnation point adsorption reflectometry and quartz crystal microgravimetry to determine its adsorption kinetics as well as the dependencies of polyelectrolyte charge densities, pH, and NaCl concentration on saturation adsorption. The conformation ...
The Adsorption Characteristics of NI (II) Onto Bubble Surface. The removal of Ni(II) by foam fractionation is brought about by the electrostatic mechanism. From removal and zeta potential measurements, it clearly demonstrates that Ni**2** plus and NiOH** plus ions become associated with the dodecylsulfonate coated (negative charge) N//2 gas bubbles. The optimal Ni(II) to NaDS (molar ratio) is 0. 2. The Ni**2** plus species forms moderately strong complexes with dodecylsulfonate ions.
We use Ca doping during growth of one- and two-monolayer-thick MgO films on Ag(100) to identify the adsorption sites of individual adatoms with scanning tunnelingmicroscopy. For thiswe combine atomic resolution images of the bare MgO layer with images of the adsorbates and the substitutional Ca atoms taken at larger tip-sample distance. For Ho atoms, the adsorption sites depend on MgO thickness. On the monolayer, they are distributed on the O and bridge sites according to the abundance of those sites, 1/3 and 2/3, respectively. On the MgO bilayer, Ho atoms populate almost exclusively the O site. A third species adsorbed on Mg is predicted by density functional theory and can be created by atomic manipulation. Au atoms adsorb on the bridge sites for both MgO thicknesses, while Co and Fe atoms prefer the O sites, again for both thicknesses.. ...
It was found that slow desorption kinetics determine the cyclic working capacity for CO2 and H2O. Furthermore, four different adsorption sites are required to describe the observed complex adsorption behaviour of CO2 and H2O and their cyclic working capacity was determined based on many different carefully designed TGA and PBR breakthrough experiments. The sorption model includes two independent adsorption sites for H2O and CO2 (sites A and B resp.) and another site which can be occupied by both CO2 and H2O, where one component replaces the other (site C). A fourth site (site D) describes the general higher adsorption capacity of the sorbent if H2O and CO2 are fed together to the sorbent ...
Molecularly imprinting (MI) hydrogels for selective adsorption of trypsin are reported. The trypsin imprinted hydrogels were prepared using a polyethylene glycol (PEG)-based dimethacrylate as a crosslinker and anionic functional monomers. The hydrogel prepared without any functional monomers showed significantly low ability to adsorb a variety of proteins. We optimized the concentration and the length of PEG units of the crosslinkers to achieve the complete removal of the template molecule and suitable selective adsorption. Additionally, the functional monomers chosen were anionic since the template, trypsin, is a basic protein. The adsorption tests for proteins, done on the prepared MI gels, indicated that the MI gel prepared with sodium allyl sulfonate (AS) as a functional monomer showed much higher selective adsorption for trypsin, even though a mixture of trypsin and cytochrome c was used as the protein solution. The selective adsorption was more effective in a NaCl solution in which the ...
Atomic oxygen adsorption on a pure aluminum terminated Al 9Co2(001) surface is studied by first-principle calculations coupled with STM measurements. Relative adsorption energies of oxygen atoms have been calculated on different surface sites along with the associated STM images. The local electronic structure of the most favourable adsorption site is described. The preferential adsorption site is identified as a bridge type site between the cluster entities exposed at the (001) surface termination. The Al-O bonding between the adsorbate and the substrate presents a covalent character, with s-p hybridization occurring between the states of the adsorbed oxygen atom and the aluminum atoms of the surface. The simulated STM image of the preferential adsorption site is in agreement with experimental observations. This work shows that oxygen adsorption generates important atomic relaxations of the topmost surface layer and that sub-surface cobalt atoms strongly influence the values of the adsorption ...
TY - JOUR. T1 - Adsorption and desorption kinetics for hydrophilic and hydrophobic vapors on activated carbon. AU - Fletcher, A.J.. AU - Yuzak, Y.. AU - Thomas, K.M.. PY - 2006/4. Y1 - 2006/4. N2 - Adsorption dynamics are of fundamental importance in applications of adsorbents in real situations. The adsorption/desorption characteristics of a series of adsorbates, with varying hydrophilic/hydrophobic and structural characteristics, for activated carbon BAX950, were investigated for temperatures in the range 288-323 K. These data provide a comprehensive kinetic study of adsorption/desorption for an activated carbon. The results are discussed in relation to the adsorbent pore structure and functional group concentration, adsorptive structure and adsorption mechanism. The study provides evidence for a compensation effect where activation energy and ln(pre-exponential factor) parameters obtained from the Arrhenius equation exhibit a linear correlation.. AB - Adsorption dynamics are of fundamental ...
In order to shed some light on DNA preservation over time in skeletal remains from a physicochemicalviewpoint, adsorption and desorption of DNA on a well characterized synthetic apatite mimicking boneand dentin biominerals were studied. Batch adsorption experiments have been carried out to determinethe effect of contact time (kinetics), DNA concentration (isotherms) and environmentally relevant factorssuch as temperature, ionic strength and pH on the adsorption behavior. The analogy of the nanocrystallinecarbonated apatite used in this work with biological apatite was first demonstrated by XRD, FTIR, andchemical analyses. Then, DNA adsorption kinetics was fitted with the pseudo-first order, pseudo-secondorder, Elovich, Ritchie and double exponential models. The best results were achieved with the Elovichkinetic model. The adsorption isotherms of partially sheared calf thymus DNA conformed satisfacto-rily to Temkins equation which is often used to describe heterogeneous adsorption behavior ...
A quartz crystal microbalance with dissipation (QCM-D) and an optical reflectometer (OR) have been used to investigate the adsorption behavior of Laponite and Ludox silica nanoparticles at the solid-liquid interface. The adsorption of both Laponite and Ludox silica onto poly(diallyldimethylammonium chloride) (PDADMAC)-coated surfaces over the first few seconds were studied by OR. Both types of nanoparticles adsorbed rapidly and obtained a stable adsorbed amount after only a few minutes. The rate of adsorption for both nanoparticle types was concentration dependent. The maximum adsorption rate of Ludox nanoparticles was found to be approximately five times faster than that for Laponite nanoparticles. The QCM data for the Laponite remained stable after the initial adsorption period at each concentration tested. The observed plateau values for the frequency shifts increased with increasing Laponite particle concentration. The QCM data for the Ludox nanoparticles had a more complex long-time ...
Enzyme adsorption onto carriers functions based on chemical and physical phenomena such as van der Waals forces, ionic ... Many immobilization techniques exist, such as adsorption, covalent binding, affinity, and entrapment. Ideal immobilization ... Jesionowski, Teofil; Zdarta, Jakub; Krajewska, Barbara (2014-08-01). "Enzyme immobilization by adsorption: a review". ... and high adsorption capacity. Enzymes typically constitute a significant operational cost for industrial processes, and in many ...
He used liquid-adsorption column chromatography with calcium carbonate as adsorbent and petrol ether/ethanol mixtures as eluent ... Adsorption]. Berichte der Deutschen Botanischen Gesellschaft. 24: 316-323. doi:10.1111/j.1438-8677.1906.tb06524.x.. On page 322 ... It's still not known whether in the case of Tsvet's adsorption analysis ([which functions] on a small scale), this change of ... doi:10.1111/j.1438-8677.1906.tb06534.x. Livengood, Jonathan (2009). "Why was M. S. Tswett's chromatographic adsorption analysis ...
Adsorption. 22 (4): 366-375. doi:10.1007/s10450-015-9740-2. (CS1 maint: uses authors parameter, Articles without KEGG source, ...
Adsorption. 16 (4-5): 183-184. doi:10.1007/s10450-010-9222-5. (Articles with ISNI identifiers, Articles with VIAF identifiers, ...
Adsorption, 2016. 22 (8): 1147-1155. DOI:10.1007/s10450-016-9838-1. v t e Salts and covalent derivatives of the nitrate ion ( ...
Molecularly imprinted materials of insulin and other drugs at the nanoscale were shown to exhibit high adsorption capacity for ... Nishide, H.; Tsuchida, E. (1976). "Selective adsorption of metal ions on poly (4‐vinylpyridine) resins in which the ligand ... Dickey, Frank (1955). "Specific Adsorption". The Journal of Physical Chemistry. 59 (8): 695-707. doi:10.1021/j150530a006. ...
Jeong J, Jeon H, Ko K, Chung B, Choi G (2012). "Production of anhydrous ethanol using various PSA (Pressure Swing Adsorption) ... Pressure swing adsorption. Pure ethanol and alcoholic beverages are heavily taxed as psychoactive drugs, but ethanol has many ...
Plasma change the adsorption/desorption equilibrium on the catalyst surface leading to higher adsorption capabilities. An ... Higher adsorption probability. Change in the catalyst oxidation state. Some metallic catalyst (e.g. Ni, Fe) are more active in ...
Two methods in common use are pressure swing adsorption and membrane gas separation. Pressure swing adsorption (PSA) ... This type of adsorption system is therefore functionally a nitrogen scrubber leaving the other atmospheric gases to pass ... To meet that need, another process, called vacuum swing adsorption (VSA), has been developed by Air Products. This process uses ... Ruthven, Douglas M.; Shamsuzzman Farooq, Kent S. Knaebel (1993). Pressure Swing Adsorption. Wiley-VCH. p. 6,304. ISBN 978-0-471 ...
Better surface adsorption. Atomically thin boron nitride has been found to have better surface adsorption capabilities than ... The synergic effect of the atomic thickness, high flexibility, stronger surface adsorption capability, electrical insulation, ... atomically thin boron nitride as an adsorbent experiences conformational changes upon surface adsorption of molecules, ... "Molecule-Induced Conformational Change in Boron Nitride Nanosheets with Enhanced Surface Adsorption". Advanced Functional ...
This filter is made up of silicate granules called zeolite which attract (via adsorption) nitrogen molecules onto their ... United States Grant US4477264A, Wilbur C. Kratz & Shivaji Sircar, "Pressure swing adsorption process for a medical oxygen ... Sircar, Shivaji (2002). "Pressure Swing Adsorption". Ind. Eng. Chem. Res. 41 (6): 1389-92. doi:10.1021/ie0109758. ... pressure swing adsorption. The basic set up of a POC is a miniaturized air compressor, a cylinder filled containing the sieve, ...
Fehime Cakicioglu-Ozkan; Semra Ulku (January 2005). "The effect of HCl treatment on water vapor adsorption characteristics of ... Semra Ülkü (1993). Novel Application of Adsorption: Energy Recovery. Studies in Surface Science and Catalysis. Vol. 80. pp. 685 ... Semra Ülkü (1986). "Adsorption heat pumps". Journal of Heat Recovery Systems. 6 (4): 277-284. doi:10.1016/0198-7593(86)90113-X ... by adsorption on silk fibroin". Separation and Purification Technology. 62 (2): 342-348. doi:10.1016/j.seppur.2008.01.022. hdl: ...
In pressure swing adsorption the raffinate refers to the gas which is not adsorbed during the high pressure stage. The species ... Ruthven, Douglas M.; Shamsuzzman Farooq, Kent S. Knaebel (1993). Pressure Swing Adsorption. Wiley-VCH. p. 1. ISBN 9780471188186 ...
... adsorption and surface chemistry; chemistry of water purification; transport of metals and other substances in water; and water ...
Adsorption 4:3-4. (1998) A. Kundu, K. Barnthouse, and S. M. Cramer. Biotech. and Bioeng., 56:119-129. (1997) KA. Kundu, A. A. ... Displacement development in adsorption analysis. Ark. Kemi. Mineral Geol. 16A: 1-18 (1943). G. T. Seaborg. The Transuranium ... the salt-dependent adsorption behavior of these low MW displacers greatly facilitates column regeneration. These displacers ...
Diffusion and adsorption processes. Characterization of compounds. Study of biological interest substances. Study of optical ...
In this approach, a liquid extractant is contained within the pores of (adsorption) particles. Usually, the extractant is an ... The basic principle combines adsorption, chromatography and liquid-liquid extraction. The principle of Solvent Impregnated ... Adsorption 14: 357-366. Babic, K.; van der Ham, L.; de Haan, A. (2006). "Recovery of benzaldehyde from aqueous streams using ... "Expansion of adsorption isotherms into equilibrium surface Case 1: solvent impregnated resins (SIR)." React. Funct. Polym. 48 ...
"Measurement of Adsorption Isotherms". Physics and Chemistry of Interfaces. Weinheim: Wiley-VCH, 2006. 206-09. Tompkins, Harland ... Ellipsometric porosimetry measures the change of the optical properties and thickness of the materials during adsorption and ...
... adsorption, catalysis and electrochemistry; interfacial processes, capillarity and wetting; biomaterials and nanomedicine; and ...
Protein adsorption Langmuir adsorption model Noh, Hyeran; Vogler, Erwin A. (January 2007). "Volumetric Interpretation of ... The Vroman effect, named after Leo Vroman, describes the process of competitive protein adsorption to a surface by blood serum ... The order of protein adsorption also depends on the molecular weight of the species adsorbing. Typically, low molecular weight ... Protein mobility plays a factor in adsorption kinetics. The simplest molecular explanation for the exchange of proteins on a ...
Defay, R. & Prigogine, I. (1966). Surface tension and adsorption. Longmans, Green & Co. LTD. Glansdorff, Paul; Prigogine, I. ( ...
Distribution of adsorption energies and odd adsorption sites. Bonds formed between the adsorbates. Compared to physisorption ... As an instance of adsorption, chemisorption follows the adsorption process. The first stage is for the adsorbate particle to ... Adsorption Physisorption Oura, K.; Lifshits, V.G.; Saranin, A.A.; Zotov, A.V.; Katayama, M. (2003). Surface Science, An ... Chemisorption is a kind of adsorption which involves a chemical reaction between the surface and the adsorbate. New chemical ...
... adsorption and ion exchange; gas-solid, liquid-solid and solid-solid operations; biochemical engineering; waste management, ...
Bartell, F. E.; Miller, E. J. (September 1922). "ADSORPTION BY ACTIVATED SUGAR CHARCOAL. I 1". Journal of the American Chemical ...
Its soil adsorption coefficient (Koc; normalized to soil organic matter content) is 25 cm3/g. Chloropicrin was manufactured for ...
Sahin, H (2012). "Chlorine Adsorption on Graphene: Chlorographene". The Journal of Physical Chemistry C. 116 (45): 24075-24083 ...
Lapidus, Leon; Amundson, Neal R. (1952). "Mathematics of Adsorption in Beds. VI. The Effect of Longitudinal Diffusion in Ion ... "Mathematics of adsorption in beds - VI: The effect of longitudinal diffusion in ion exchange and chromatographic columns", ...
Wu, D.-W.; Aranovich, G.L.; Donohue, M.D. (1999). "Adsorption of Dimers at Surfaces". Journal of Colloid and Interface Science ... Aranovich, G. L.; Donohue, M. D. (1999-11-01). "Phase loops in density-functional-theory calculations of adsorption in ... Hocker, Thomas; Aranovich, Grigoriy L.; Donohue, Marc D. (1999). "Monolayer Adsorption for the Subcritical Lattice Gas and ... surface-adsorption, self-assembly, crystallization, as well as steady state diffusion. Hill TL. Statistical Mechanics, ...
Lagergrens's 1898 article "Zur Theorie der Sogenannten Adsorption Gelöster Stoffe" (To the theory of the so-called adsorption ... In his perennial 1898 paper, Lagergren formulated a so-called pseudo-first-order model for adsorption kinetics based on an ... Ho, Yuh-Shan (2004). "Citation review of Lagergren kinetic rate equation on adsorption reactions". Scientometrics. 59 (1): 171- ... Freundlich, Herbert (1907). "Über die Adsorption in Lösungen". Zeitschrift für Physikalische Chemie. 57U(1): 385-470. ...
Comparisons of adsorption rates for zinc ions of CNTs vs. other materials such as commercially available PAC were very ... Li, Y.H.; Wang, S.; Wei, J.; Zhang, X.; Xu, C.; Luan, Z.; Wu, D.; Wei, B. (2002). "Lead adsorption on carbon nanotubes". Chem. ... CNT Membranes show a particular affinity for adsorption by heavy metals ions such as Zn2+, which is toxic to aquatic organisms ... and reusable for 10 cycles of adsorption and deadsorption. CNT filtration has also been shown to adsorb other heavy metals such ...
The plant is based on a novel design using pressure swing adsorption technology and is sized to fit on a standard shield car or ... Mining Publication: Use of Pressure Swing Adsorption Technology to Inert Sealed Mine Areas with Nitrogen. Keywords: Nitrogen ...
1958)‎. Adsorption of tuberculin to glass. Bulletin of the World Health Organization, 19 (‎5)‎, 783 - 798. https://extranet.who ...
At the maximum adsorption, only a monolayer is formed. Adsorption only occurs on localized sites on the surface, not with other ... As an adsorption chiller requires no compressor, it is relatively quiet. Portal site mediated adsorption is a model for site- ... The adsorption of ensemble molecules on a surface or interface can be divided into two processes: adsorption and desorption. If ... The typical overall adsorption rate is thus often a combined result of the adsorption and desorption. Since 1980 two theories ...
... ADSORPTION: *General: Talbot et al. 99/06; *Type: RANDOM SEQUENTIAL: Privman 93/12; ...
The data is instead consistent with a model that includes physical adsorption of polymer chains at the solid/liquid interface. ... In the dilute-adsorption regime, adding the adsorption-induced frictional stress of Eq. (10b) from ref.56 to the previous ideal ... it assumes adsorption of chains in the low-shear-rate leveling experiments and no chain adsorption in the high-shear-rate ... Ilton, M., Salez, T., Fowler, P.D. et al. Adsorption-induced slip inhibition for polymer melts on ideal substrates. Nat Commun ...
The process by which a thin film of gas or liquid forms on a solid surface. The film does not react chemically with the material on which it is deposited. Compare absorption (1).
BibMe lets you easily and automatically create website citations and build your bibliography in Adsorption. Its accurate and ...
Nokia sites use cookies to improve and personalize your experience and to display advertisements. The sites may also include cookies from third parties. By using this site, you consent to the use of cookies. Learn more ...
... and adsorption of n-hexane on the attrition-ground material was compared with adsorption on two commercial silica adsorbents. ... and adsorption of n-hexane on the attrition-ground material was compared with adsorption on two commercial silica adsorbents. ...
BibMe quickly generates Adsorption citations and bibliographies. Its accurate and free! ...
US-6605136-B1 chemical patent summary.
Buy Two Little Fishies PhosBan Phosphate Adsorption Media - 150g at the lowest prices, free shipping deal every day and expert ...
... governs the transition from diffusion controlled adsorption to kinetically controlled adsorption for spherical interfaces. If ... In pendant drop studies one is restricted to diffusion or mixed controlled adsorption at small concentrations, but in reality ... Using this method we measure kinetic adsorption constants directly. We also describe a new timescale for diffusion, which ... Abstract: L14.00008 : Kinetically Controlled Adsorption to Freshly Formed Interfaces. 3:54 PM-4:06 PM ...
Xebec Adsorption Inc T.XBC. Primary Symbol: XEBEQ. Industrials Diversified Industrials. Xebec Adsorption Inc designs, engineers ...
Le but global du mandat, soit de permettre la diffusion de la technique de la réfrigération solaire à adsorption dans les pays ... Mhiri F. and El Golli S., Etude dun réfrigérateur solaire à adsorption solide avec le couple charbon actif-méthanol, Rev. Gén ... Pons M. and Grenier Ph., Experimental data on a solar-powered ice maker using activated carbon and methanol adsorption pair, J ... Marmottant B., Mhimid A., El Golli S. and Grenier Ph., Installation de réfrigération solaire à adsorption : expérimentation et ...
Water vapor adsorption/desorption isotherm is a powerful tool to characterize such surfaces. The aim of this paper is to ... Methods: Simplest tools of theoretical analysis of adsorption/desorption isotherms are applied. Results: Parameters ... present theoretical approach for calculating roots surface parameters as adsorption energy, distribution of surface adsorption ... J. Oscik, "Adsorption," Ellis Horwood, Chichester, 1982. [9] B. B. Mandelbrot "The Fractal Geometry of Nature," Freeman, San ...
disibledevent= 20.8 mg/g). Analysis indicated that pseudo-second-order kinetics controlled the adsorption rate and it has been ... "Adsorption Kinetics of Cupric Ions on Mixture of Modified Corn Stalk and Modified Tomato Waste" written by Sareh Vafakhah, ... Adsorption of nickel and cadmium by corn cob biomass chemically modified with alumina nanoparticles. Indian Journal of Science ... Adsorption of nickel and cadmium by corn cob biomass chemically modified with alumina nanoparticles. Indian Journal of Science ...
A method for delivering a radiotherapeutic agent to a target, comprises administering a composition comprising water-soluble nanotubes having an average length less than 50 nm and a radionuclide so as
In the present work the adsorption capacity of CTMA on attapulgite was found that was high and was mostly due to ion exchange ... The adsorption of the cationic surfactant, cetyltrimethylammonium chloride (CTMA) from aqueous solutions on attapulgite was ... adsorption compared to cation exchange. Kaolinite there had a CEC of 30 - 37 meq/kg and an almost twice sorption capacity of 58 ... Adsorption has been recognized as an effective and promising technique and has been used in tertiary water and wastewater ...
This Demonstration considers the adsorption and diffusion of a substance that undergoes an irreversible chemical reaction while ... Adsorption, Diffusion and Chemical Reaction in a Slab. Clay Gruesbeck. * Diffusion and Reaction in a Falling Liquid Film. Clay ... This Demonstration considers the adsorption and diffusion of a substance that undergoes an irreversible chemical reaction while ... Clay Gruesbeck Adsorption, Diffusion and Chemical Reaction in a Slab. ...
... the effective surface charge was modified by carboxylate anion adsorption through the incremental addition of oxalic and citric ... in aqueous environments at ambient temperature and the ability to modify analysis scales by variation of the adsorption cross ... reagent additive was found to exhibit inverse hyperbolic sine-type behavior predicted to arise from monolayer adsorption ... Chromate and oxalate adsorption on goethite. 2. Surface complexation modeling of competitive adsorption. *Karel Mesuere, W. ...
Protein adsorption to hydrocephalus shunt catheters: CSF protein adsorption Message subject: (Your Name) has forwarded a page ...
In this section we will consider both the energetics of adsorption and factors which influence the kinetics of adsorption by ... The heat of adsorption, Q, is taken to be a positive quantity equal in magnitude to the enthalpy of adsorption ; i.e. Q = -ΔH ... The energy of adsorption is negative, and since it corresponds to the energy change upon adsorption it is better represented as ... In this section, we will consider both the energetics of adsorption and factors which influence the kinetics of adsorption by ...
BARNABA, C.; GARCIA-ALVARADO, M.A.; MEDINA-MEZA, I.G. e TEJERO-ANDRADE, J.M.. Langmuir adsorption isotherms for different ...
Research findings supported that adsorption process is spontaneous in nature. Adsorption data confirmed Langmuir model, ... Adsorption is the most common method because of cheap, simple and effective method. In this work, activated carbon was used for ... dye adsorption purpose. This adsorbent has high surface area and high porosity to remove dye. This review highlighted some ... Adsorption process is exothermic and spontaneous in nature. The adsorption of direct blue 106 dye increased, when the adsorbent ...
Factors controlling enantiomer-selective amino acid adsorption on mineral and metal surfaces ...
  • The adsorption of gases and solutes is usually described through isotherms, that is, the amount of adsorbate on the adsorbent as a function of its pressure (if gas) or concentration (for liquid phase solutes) at constant temperature. (
  • The aim of this paper is to present theo retical approach for calculating roots surface parameters as adsorption energy, distribution of surface adsorption centers, as well as roots geometric and structure parameters as surface fractal dimension, nanopore sizes and size distributions on example of experimental isotherms of roots of barley taken from the literature. (
  • Simplest tools of theoretical analysis of adsorption/desorption isotherms are applied. (
  • MEDINA-MEZA, I.G. e TEJERO-ANDRADE, J.M. . Langmuir adsorption isotherms for different organic solutions of cholesterol . (
  • The N 2 adsorption-desorption isotherms at 77 K were measured using a Quantachrome NOVA 2000E analyzer. (
  • Chitin, before and after the treatments, was characterized by N2 adsorption isotherms (BET), infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). (
  • The adsorption study was performed by equilibrium isotherms and kinetic curves. (
  • This will be conducted in presence and absence of an electrical field in order to investigate the influence of the charging state on the electrolyte ions, and (iii) the analysis of the pore filling mechanism (adsorption isotherms) via quantitative liquid phase NMR spectroscopy. (
  • Adsorption isotherms of CH4, CO2 and SO2 were measured by using the volumetric method apparatus. (
  • Correlations Among the Parameters of Dubinin-Radushkevich and Langmuir-Freundlich Isotherms for Adsorption from Binary Liquid Mixtures", A.Derylo-Marczewska, M.Jaroniec, J.Oscik and A.W.Marczewski, J.Colloid Interface Sci. (
  • Pure component isotherms by push-button apparatus are a first step to characterize adsorption, but process development also requires mixture data since models are not dependable. (
  • Adsorption isotherms of Azure B on wheat straw (WS), sugarcane bagasse (SGB), oat husk, and isolated lignin materials were determined. (
  • The maximum adsorption capacities predicted by the Langmuir isotherms were used to calculate the amounts of surface-accessible acidic hydroxyl groups. (
  • Experimental isotherms of CO2 adsorption on (Na,TEA)-ZSM-25 always present an inflection at a constant adsorbed amount. (
  • Centineo A. and Brandani S. Measurement of Water Vapor Adsorption Isotherms in Mesoporous Materials Using the Zero Length Column Technique. (
  • In this section, we will consider both the energetics of adsorption and factors which influence the kinetics of adsorption by looking at the 'potential energy diagram/curve' for the adsorption process. (
  • By using fast AFM scanning, the authors evaluated the adsorption kinetics of recombinant SARS-CoV-2 S1 proteins from a time-dependent surface coverage on the AFM images. (
  • The kinetics of protein adsorption on surfaces grafted with poly(ethylene oxide) (PEO) chains were studied. (
  • The quantitative analysis of the elongation kinetics suggests that the DNA adsorption to the vesicle surface (as ternary DNA/Ca/lipid complexes) renders the membrane more flexible and prone for potential electroporation. (
  • The kinetics of uptake of each xylene by MIL-53(Fe)[H2O], in which the water is replaced by the organic guest, have been studied using time-resolved energy-dispersive X-ray diffraction: this shows differences in kinetics of the adsorption of the three isomers. (
  • Adsorption kinetics of laterally and polarly flagellated Vibrio. (
  • Brandani S. and Mangano E. The Zero Length Column Technique to Measure Adsorption Equilibrium and Kinetics: Lessons Learnt from 30 Years of Experience. (
  • The adsorption equilibrium was achieved within 1 h and the adsorption kinetics was found to obey the first-order Lagergren equation. (
  • The data is instead consistent with a model that includes physical adsorption of polymer chains at the solid/liquid interface. (
  • Physical adsorption of the recombinamers and covalent-grafting through organosilane chemistry were investigated. (
  • being the covalent bonding favourable over physical adsorption. (
  • The test method specifies general procedures that are applicable to many commercial physical adsorption instruments. (
  • For this blog, we will limit our discussion to physical adsorption. (
  • Unified Theoretical Description of Physical Adsorption from Gaseous and Liquid Phases on Heterogeneous Solid Surfaces and Its Application for Predicting Multicomponent Adsorption Equilibria", A.W.Marczewski, A.Derylo-Marczewska and M.Jaroniec, Chemica Scripta, 28 , 173-184 (1988) ( pdf , hi-res pdf available upon e-mail request). (
  • Depending upon the nature of forces between molecules of adsorbate and adsorbent, adsorption is of two types Physical Adsorption and Chemical Adsorption. (
  • 11. Which of the following isotherm is applicable to physical adsorption? (
  • 13. Which of the following statements regarding the physical adsorption of a gas on surface of solid is not correct? (
  • Irving Langmuir was the first to derive a scientifically based adsorption isotherm in 1918. (
  • It is the most common isotherm equation to use due to its simplicity and its ability to fit a variety of adsorption data. (
  • Lastly, adsorption kinetic and isotherm were highlighted. (
  • In addition to batch adsorption tests, isotherm, kinetic and thermodynamic studies, experimental optimization was carried out with experimental parameters determined by the surface response methodology. (
  • Poplar biochars from pyrolysis at temperatures of 300, 500 and 700 °C were modified with KOH and characterized by elemental analysis, Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), and nitrogen adsorption-desorption isotherm studies. (
  • The exact capacity is based on many factors and is referred to as the adsorption isotherm. (
  • Quite often, some adsorption data may be well described by more than one isotherm equation. (
  • lactoglobulin were determined at various conditions of the protein solution by an adsorption isotherm. (
  • Let us practise or solve them to understand how much we really know about Adsorption Isotherm. (
  • The plant is based on a novel design using pressure swing adsorption technology and is sized to fit on a standard shield car or mine dolly for easy transport in and around an underground coal mine. (
  • Pressure Swing Adsorption (PSA) inlet valves feed hydrogen and light hydrocarbon gas into the PSA unit. (
  • Pressure Swing Adsorption technologies offer a solution for every application in the PSA. (
  • Novel gas separation processes, coupling pressure swing adsorption (PSA) and membrane technologies, are presented for both cooperative and opposing regions of selectivity for the two units. (
  • Hence, the purpose-built dual piston pressure swing adsorption apparatus is used for the experiments. (
  • The hydrogen (H 2 ) plant in a refinery produces high-purity (99.9+ vol%) H 2 products using a licensed pressure swing adsorption (PSA) purification process to fulfill the H 2 makeup needs of refinery hydroprocessing facilities. (
  • Pressure swing adsorption in a H 2 plant. (
  • Adsorption data confirmed Langmuir model, indicating the chemisorption occurred. (
  • Adsorption study of Alizarin yellow revealed that all data fitted into Langmuir model and pseudo-second kinetic. (
  • Langmuir and Freundlich models were adequate to represent the adsorption equilibrium. (
  • Relationships Defining Dependence Between Adsorption Parameters of Dubinin-Astakhov and Generalized Langmuir Equations", M.Jaroniec and A.W.Marczewski, J.Colloid Interface Sci. (
  • The adsorption behavior fits the Langmuir model, and the adsorption enthalpy change H is positive, indicating endothermic chemisorption. (
  • Adsorption is the adhesion of atoms, ions or molecules from a gas, liquid or dissolved solid to a surface. (
  • Note 2: Adsorbed molecules are those that are resistant to washing with the same solvent medium in the case of adsorption from solutions. (
  • The coefficients of diffusion, adsorption, and desorption are fundamental properties of surfactant molecules and should be independent of the nature in which they are applied. (
  • The interaction between water molecules and surfaces in porous systems is of huge importance in various fields including but not limited to catalysis, adsorption, and the storage or conversion of electrochemical energy. (
  • In order to illuminate the interactions between nitrogen-containing carbon surfaces and water molecules, water adsorption is studied in this work on a series of model materials with different pore structures and atomic construction. (
  • All materials tested exhibit microporous character, enhancing adsorption of small molecules, however, it is the inclusion of a nitrogen-rich material into the gel matrix that results in enhanced selectivities for these systems. (
  • The interaction among adsorbed CO molecules appears to have a significant effect on the adsorption energies at full coverage. (
  • Accurate calculations of adsorption energies of cyclic molecules are of key importance in investigations of, e.g., hydrodesulfurization (HDS) catalysis. (
  • Values are calculated for the adsorption energies of butadiene, thiophene, benzothiophene, pyridine, quinoline, benzene, and naphthalene on the basal plane of MoS2, showing good agreement with available experimental data, and the equilibrium geometry is found as flat at a separation of about 3.5 A for all studied molecules. (
  • In the past, scanning tunneling microscopy and scanning tunneling spectroscopy studies of PTCDA adsorbed on Ag(111) have revealed differences in the electronic structure of the molecules depending on their adsorption geometry. (
  • Based on scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) experiments as well as theoretical simulations, it was found that the differences between the two possible adsorption geometries of PTCDA on the Ag(111) substrate affect the electronic structure of the molecules [2-5] . (
  • Therefore, the work will include experimental measurements using primarily zero-length-column systems followed by process modelling of temperature swing adsorption units to concentrate the molecules of interest from ppm level to at least 1-5% by volume. (
  • The molecular modeling of the adsorption at the liquid-solid interface is challenging because the pathway of how molecules approach and stick to the catalytic surface with the presence of the solvent is less studied. (
  • For extracorporeal blood purification by adsorption of a wide spectrum of endogenous and exogenous toxic substances (small and medium molecules). (
  • In particular, volumetric adsorption measurements and 1 H solid-state NMR spectroscopic investigations in combination with theoretical calculations on water in nitrogen-rich C 2 N materials show a remarkably strong heat of adsorption significantly above 60 kJ mol −1 , that is, far beyond what is typically considered physisorption. (
  • G. Jozefaciuk, M. Lukowska and J. Szerement, "Determination of Energetic and Geometric Properties of Plant Roots Specific Surface from Adsorption/Desorption Ishoterm," American Journal of Plant Sciences , Vol. 4 No. 8, 2013, pp. 1554-1561. (
  • The products were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), N 2 adsorption-desorption, and Fourier transform infrared (FT-IR) spectrum. (
  • By comparing the measured interfacial tension to the one that we expect in the case of a constant number of adsorbed monomers, we are able to deduce whether desorption or adsorption occurs during area variations. (
  • The result is a media that requires no pre-conditioning, exhibits fast adsorption and extraction and offers complete desorption using only small solvent volumes. (
  • Each vessel goes through four stages in a cycle: adsorption, depressurization, desorption (regeneration) and repressurization. (
  • Abstract The co-adsorption of hydrogen and carbon monoxide on Pd 3 Ag(111) alloy surfaces has been studied as a model system for Pd-Ag alloys in membrane and catalysis applications using periodic density functional theory calculations (PW91-GGA). (
  • Silica was selected as the test material, and adsorption of n-hexane on the attrition-ground material was compared with adsorption on two commercial silica adsorbents. (
  • This study investigated the preparation method and adsorption efficiency of porous adsorbents prepared from banana peels (BP) waste. (
  • Selectivity of adsorption of Azure B on lignin was demonstrated using lignin and cellulose materials as adsorbents. (
  • The second part of this work presents the multisite rigid adsorbent lattice fluid (multi-RALF) model, a novel thermodynamic theory to model multicomponent adsorption on heterogeneous adsorbents. (
  • Both MIL adsorbents are found promising which can be considered for various adsorption applications. (
  • A measurement procedure for gas adsorption is employed which, after establishing methane adsorption equilibrium of the coal samples, injects pure CO2 or the synthesized flue gas into an adsorption cell in order to investigate CH4 replacement properties. (
  • Results show that protein adsorption on PEO-grafted glass reaches its equilibrium state rapidly. (
  • All relevant definitions and relations are explained in this paper and illustrated with a set of pure and binary mixture adsorption equilibrium data. (
  • Given the relevance of reliable equilibrium and kinetic parameters for the simulation of monoliths, this thesis further investigates how to model multicomponent adsorption on heterogeneous solids, and how to extract kinetic parameters from experiments. (
  • The main bottleneck in the lower COP level is the low adsorption equilibrium amount. (
  • This study is aimed to provide comprehensive detail of water-vapor adsorption equilibrium and physicochemical properties of hydrophilic MOFs. (
  • Adsorption processes are clear candidates for the initial stage of recovery from very dilute conditions, but there are limited datasets in the literature that include equilibrium and kinetic information needed to design such processes. (
  • We found that CO pre-adsorbed on the surface weakens the adsorption of H on Pd 3 Ag(111) alloy surfaces irrespective of whether the surface termination corresponds to the bulk Pd 3 Ag composition, or is purely Pd-terminated. (
  • A bioactive elastin-like recombinamer reduces unspecific protein adsorption and enhances cell response on titanium surfaces. (
  • The coated metal surfaces exhibited excellent reduction of serum protein adsorption (9 ng/cm2) compared to the bare metal surface (310 ng/cm2). (
  • Three-dimensional (3D) structures in the form of inverse opals and opals-like structures were constructed on a scale of millimeters for their use in the adsorption of heavy metals adsorption on manganese oxide-covered surfaces. (
  • In this publication, researchers used atomic force microscopy (AFM) to study the adsorption of the SARS-CoV-2 spike protein subunit (S1) at fomite surfaces, modelled using Al2O3 (0001), and TiO2 (100) interfaces in situ. (
  • The results point towards a stronger adsorption at TiO2 (100) surfaces than Al2O3 (0001). (
  • We have calculated adsorption energies for CO on all low index ZnF2 surfaces using DFT with the B3LYP functional and subsequent dispersion correction. (
  • In most of the cases, the adsorption of CO on different surfaces is described well using B3LYP. (
  • The understanding of the adsorption phenomena of polymers on surfaces is a prerequisite, e.g., for designing micro- or nanostructures. (
  • However, a part of the injected polymer is lost in porous media by adsorption on surfaces, mechanical entrapment in pores, and hydrodynamic retention in stagnant zones. (
  • The increase of temperature had a positive effect on the adsorption process. (
  • It was seen that pH effect on the adsorption of carbamazepine is not very significant. (
  • Adsorption is a surface phenomenon, while absorption involves the whole volume of the material, although adsorption does often precede absorption. (
  • Like surface tension, adsorption is a consequence of surface energy. (
  • Adsorption, ion exchange and chromatography are sorption processes in which certain adsorbates are selectively transferred from the fluid phase to the surface of insoluble, rigid particles suspended in a vessel or packed in a column. (
  • M. Jaroniec and P. Brauer, "Recent Progress in Determination of Energetic Heterogeneity of Solids from Adsorption Data," Surface Science Reports, Vol. 6, No. 2, 1986, pp. 65-117. (
  • This absorbent has high BET surface area (Ho, 2019) and highly developed microporosity which enhanced adsorption process (Ho, 2017) . (
  • PDF] Scalable surface area characterization by electrokinetic analysis of complex anion adsorption. (
  • For alumina powders of differing morphology in mildly acidic aqueous suspensions, the effective surface charge was modified by carboxylate anion adsorption through the incremental addition of oxalic and citric acids. (
  • Ultrasound-assisted (UA) and supercritical CO2 technologies (SCO2) were used to modify the chitin surface and, improve its adsorption characteristics regarding to cobalt. (
  • The maximum adsorption capacities were 50.03, 83.94 and 63.08 mg g−1 for unmodified chitin, UA surface modified chitin and SCO2 surface modified chitin. (
  • UA and SCO2 technologies are alternatives to modify the chitin surface and improve its adsorption characteristics. (
  • Values of BET surface area determined from nitrogen adsorption data follow the sequence Co (20% w/v) - Al_2O_3 (
  • the presence of large amounts of alkali metals can further improve the hydrogen adsorption properties, but surface chemistry still has a major influence, especially through the acidic surface functions. (
  • A detection limit of 0.4 ng/ml (ppb) for TNT was achieved using a sensor surface with the lowest affinity without non-specific adsorption. (
  • This SPR sensor has high sensitivity to changes in the refractive index upon the adsorption of substances on a thin gold surface. (
  • This thesis presents results on the adsorption and dissociation of CO2 and the initial oxidation of both the low-index Cu(100) and the vicinal Cu(911) surface. (
  • The results on the dsorption of CO2 on Cu(911) show that although the stepped surface facilitates the adsorption, the rate of the increase of atomic oxygen is not faster compared to on Cu(100). (
  • Saleh, T.A. Nanocomposite of carbon nanotubes/silica nanoparticles and their use for adsorption of Pb(II): from surface properties to sorption mechanism. (
  • In response to these intrinsic drawbacks, the surface imprinting technique has been proposed by creating the imprinted cavities with high affinity on the surface of a suitable matrix, which not only possesses high adsorption capacity but also avoids problems of limited mass transfer and template removal. (
  • Some common industrial operations in which organic emissions and odors can be effectively controlled by adsorption include dry-cleaning, degreasing, surface coating, rubber processing, gravure printing, and others. (
  • It is found that the excess adsorption amount in the nanopore in the simulations and between the simulations and the experiments are comparable by expressing it in per unit surface area of the adsorbent. (
  • Grand canonical Monte Carlo (GCMC) simulation was used for the systematic investigation of the supercritical methane adsorption at 273 K on an open graphite surface and in slitlike micropores of different sizes. (
  • The microscopic mechanism of the CO2 adsorption process is presented at the atomic level, and the detailed potential energy surface and reaction path information are provided. (
  • Yet, important fresh perspectives on surface interactions and molecular conformations are gained from adsorption heights that remain largely inaccessible to SPM, but can be precisely measured with both elemental and chemical sensitivity by Normal-Incidence X-ray Standing Wave (NIXSW) analysis. (
  • Here, we study the evolution of adsorption heights in the on-surface synthesis and post-synthetic decoupling of porous covalent triazine-phenylene networks obtained from 2,4,6-tris(4-bromophenyl)-1,3,5-triazine (TBPT) precursors on Ag(111). (
  • The interpretation of experimental results is informed by Density Functional Theory (DFT) calculations, providing a consistent picture of adsorption heights and molecular deformations in the networks that result from the interplay between steric hindrance and surface interactions. (
  • Quantitative adsorption heights, i.e. vertical distances between adsorbates and surface, provide detailed insight into surface interactions, but are underexplored in on-surface synthesis. (
  • The adsorption structure of aqueous triblock copolymer polypropylene oxide-polyethylene oxide-polypropylene oxide, PPO-PEO-PPO, on the Si surface was studied using neutron reflectometer. (
  • To determine the enthalpy of different types of adsorbed water, we performed water adsorption calorimetry on goethite and hematite with surface areas of 60-270 and 2-150 m 2 /g, respectively, using a new calorimetric technique combining a microcalorimeter and an automated gas dosing system. (
  • Mazeina, L & Navrotsky, A 2007, ' Enthalpy of water adsorption and surface enthalpy of goethite (α-FeOOH) and hematite (α-Fe 2 O 3 ) ', Chemistry of Materials , vol. 19, no. 4, pp. 825-833. (
  • This provides evidence that soluble O 16 -antigen likely affects T4 bacteriophage infectivity through reversible interactions and delays its rate of adsorption to the cell surface. (
  • Description The protein adsorption on polymeric membrane surface is the major factor to cause the membrane fouling in ultrafiltration (UF) processing to concentrate, fractionate, and separate whey proteins from liquid whey which is byproduct of cheese manufacturing process. (
  • In order to better understand fouling mechanism, to optimize the process condition to minimize fouling, and to develop the novel membranes to reduce fouling, the protein adsorption on the polymeric membrane surface was studied by static adsorption and dynamic adsorption experiments. (
  • To develop the novel membranes to reduce the protein adsorption and fouling, two surface modification methods were developed by hydrophilic polymers grafting using UV/Ozone treatment and thin film composite (TFC) through interfacial polymerization. (
  • ZnO hollow microspheres with exposed porous nanosheets surface: Structurally enhanced adsorption towards heavy metal ions. (
  • The phenomenon of increase in concentration at the surface due to molecular surface force is known as adsorption. (
  • The solid or liquid substance on the surface of which adsorption takes place is called adsorbent. (
  • Adsorption is due to the fact that the surface particles of the adsorbent are in different state than the particles inside the bulk. (
  • The characteristics of the nano-porous supporting material providing a high contact surface area for CO2 to react with K2CO3 essentially enhance the chemical adsorption capacity. (
  • In addition it yields an estimate of the density of states, which possesses a convex regime at the adsorption transition in the case of short chains and strong surface attraction. (
  • However, the molecular modeling of the solid-liquid interfaces, especially the adsorption and the surface intermediate reaction, which are important steps in aqueous phase heterogeneous catalysis, are still under development. (
  • In order to better understand these systems, in this work, we developed novel mathematical and molecular methods to study the catalytic adsorption and the surface adsorbate solvation free energies at the liquid-Pt(111) interface. (
  • Objective: Manganese oxides both, as commercial powders and as synthesized coatings by the chemical bath method, have a high capacity of lead ions adsorption. (
  • Here it is shown that the adsorption of larger oligonucleotides such as fragments (ca. 300 bp) of sonicated calf-thymus DNA, to anionic lipids of unilamellar vesicles (diameter [Phi] = 300 ± 90 nm) is greatly enhanced by divalent cations such as Ca2+ ions. (
  • The chelating adsorption performance and mechanism of HQ-PHEMA/SiO2 towards Cu2+ and Ni2+ ions was studied, and the adsorption thermodynamics was investigated. (
  • Ni2+ ions, the adsorption capacities were up to 63.4 mg g(-1) and 51.1 mg g(-1), respectively. (
  • Li, Z. Hydrogel-supported nanosized hydrous manganese dioxide: Synthesis, characterization, and adsorption behavior study for Pb2+, Cu2+, Cd2+ and Ni2+ removal from water. (
  • Key activities include UV photoreactions, chromatography and spectroscopy characterization of PFAS and products, adsorption material preparation and characterization, and operation of bench-scale reactor chain. (
  • The present study aims at advancing PAC and GAC laboratory tests for a more profound characterization of competitive adsorption in different waters, and its prediction using different mathematical and analytical tools. (
  • The Micromeritics ASAP 2020 is a flexible gas adsorption analyzer capable of measuring the hydrogen adsorption capacity of powders and porous materials. (
  • Adsorption is a mass transfer process in which a porous solid comes in contact with a liquid or gaseous stream to selectively remove pollutants or contaminates by depositing (adsorbing) them onto the solid. (
  • Most applications of adsorption involve fluid mixtures and porous solids. (
  • My research project about CO2 capture over the solid sorbents is to measure the adsorption capacity and regeneration property, over a range of low temperatures, of the alkali metal-based sorbent K2 CO3, which is supported on the nano-structured porous material AlOOH. (
  • Maximum adsorption capacities ( q e,m ) of TC in modified biochar from a low pyrolysis temperature of 300 °C increased up to 21.17 mg g −1 relative to 4.30 mg g −1 in unmodified biochar of 300 °C (final TC concentrations were 8.83 and 25.70 mg L −1 , respectively). (
  • The CO2 adsorption capacities of coals were investigated by Huy et al. (
  • The last value corresponds to water adsorption on very fine grained hematite and is very close to the water adsorption enthalpy for goethite, ΔH ads = -19.4 ± 4.2 kJ/mol. (
  • Magnetic strong adsorption mobile phone shell (a total of 16 magnetic points) automatic closing, easy to assemble. (
  • Strong Adsorption Alumina Ceramic Foam Filter PlateDescription :Alumina ceramic foam filter is a kind of effective molten metal filter. (
  • Through the strong magnetic adsorption technology, the upper and lower covers of the case can be tightly fitted. (
  • The effect of heteroatoms on hydrogen adsorption properties of activated and hybrid carbon materials is critically described. (
  • Hydrogen adsorption over iron and titanium based catalyst doped with Pt, Pd, Rt. (
  • Xebec Adsorption Inc designs, engineers, and manufactures products that are used for purification, separation, dehydration, and filtration equipment for gases and compressed air. (
  • In all cases, selected xerogels exhibited industrially relevant adsorption timescales for CO2 over competitor gases, demonstrating the potential of these materials for the selective adsorption of CO2 from process streams. (
  • The concentration of gases was taken from the adsorption cell and analyzed by using a gas chromatograph. (
  • Adsorption can also be used to purify intake or circulating air streams and in fractionization of certain gases. (
  • Adsorption at high pressure pulls all the heavier gases/impurities from the feed gas, producing 99.9% pure H 2 . (
  • iii) Separation of inert gases : Due to the difference in degree of adsorption of gases by charcoal, a mixture of noble gases can be separated by adsorption on coconut charcoal at different temperatures. (
  • Thermodynamic parameters, i.e. standard free energy changes (ΔGº), standard enthalpy change (ΔHº) and standard entropy change (ΔSº), revealed that Cu2+ adsorption by humin and humic acid were a feasible, spontaneous and endothermic process with an increase in disorder. (
  • In pendant drop studies one is restricted to diffusion or mixed controlled adsorption at small concentrations, but in reality to get at the kinetic coefficients it would be more advantageous to probe the kinetic controlled regime. (
  • This paper uses a micro-tensiometer to probe the adsorption dynamics to micron diameter spherical interfaces to test the transition from diffusion limited to kinetic limited adsorption. (
  • Using this method we measure kinetic adsorption constants directly. (
  • The adsorption kinetic curves were well represented by the pseudo-second order model. (
  • The exact nature of the bonding depends on the details of the species involved, but the adsorption process is generally classified as physisorption (characteristic of weak van der Waals forces) or chemisorption (characteristic of covalent bonding). (
  • Adsorption is present in many natural, physical, biological and chemical systems and is widely used in industrial applications such as heterogeneous catalysts, activated charcoal, capturing and using waste heat to provide cold water for air conditioning and other process requirements (adsorption chillers), synthetic resins, increasing storage capacity of carbide-derived carbons and water purification. (
  • If the spherical interface has a radius smaller than R$_{D-K}$ the adsorption process is kinetically limited. (
  • Research findings supported that adsorption process is spontaneous in nature. (
  • A two-step detoxification process consisting of electrodialysis and adsorption was performed to improve the fermentability of oxalic acid hydrolysates. (
  • However, absorbent materials have been reported are still suffering drawbacks of slow adsorption rate, non-specific adsorption and complicated preparation process etc. (
  • The adsorption process can be both a physical and chemical process. (
  • Dynamic adsorption process was studied by QCM-D, which allows monitoring of the protein adsorption process in real time by simultaneously measuring of frequency shift (?f) and dissipation shift (?D). (
  • Unlike in a conventional PSA process, the adsorption beds for the integrated system are fed with a varying-composition gas stream, initially rich in the less adsorbed component, which is progressively enriched in the other component with the opposite behavior. (
  • The effect of various operating parameters, such as permeation throughput, total feed amount per cycle, purge-to-feed ratio, and adsorption and blowdown pressures, is assessed through detailed process simulation. (
  • Straight-channel monoliths are a promising means to achieve process intensification of adsorption processes compared to conventional packed beds. (
  • It may be defined as the process in which both adsorption and absorption take place simultaneously. (
  • Although no commercially available adsorption process for CO2 capture still exists, intensive scientific research along with a sharp increase in patent numbers has been reported recently for this emerging technology. (
  • The aim of this research project is to simulate a gas adsorption process for CO2 capture and to evaluate how different operating conditions and/or parameters would affect the separation step. (
  • suggests that the adsorption process is entropically driven. (
  • General design of an ozone reactor and adsorption unit, as well as estimates of capital and operating costs for both processes, have also been presented. (
  • This work is based on the study of hydrogen storage through adsorption in nanostructured carbon materials, and was divided in three parts: a literature review on hydrogen storage, the set-up of an experimental test bench devoted to the measurements of hydrogen storage, and finally the work presents the experimental results of hydrogen storage on two different families of carbon materials produced in the laboratory thanks to two different processes. (
  • Provided are apparatus and systems having a rotary valve assembly integrated with a reciprocating valve assembly to perform swing adsorption processes. (
  • Gain a practical understanding of evaporators and adsorption columns used in chemical engineering unit operations and processes. (
  • Solid sorbents are usually packed as fixed beds and employed in unsteady cyclic processes composed of adsorption and regeneration steps. (
  • As part of this effort, this PhD opportunity is linked to the objective to develop novel solutions based on adsorption separation processes for the recovery of reactive nitrogen (for example ammonia and, NOX) from dilute streams. (
  • Gibson J.A.A., Mangano E., Shiko E., Greenaway A.G., Gromov A.V., Lozinska M.M., Friedrich D., Campbell E.E.B., Wright P.A. and Brandani S. Adsorption Materials and Processes for Carbon Capture from Gas-Fired Power Plants- AMPGas, Ind. (
  • Vuong, T and Monson, PA, "Monte Carlo simulation studies of heats of adsorption in heterogeneous solids" (1996). (
  • The treatment train contains three core components- (i) oxidative pre- and post-treatment, (ii) PFAS adsorption, and (iii) adsorption material regeneration using reductive PFAS defluorination. (
  • Instead, defluorination of adsorption-enriched PFAS for adsorbent regeneration may significantly reduce the capital cost, and be time-insensitive and unaffected by other components in groundwater. (
  • Effect of preparation method and substitution of Al2O3 by ZrO2 on the adsorption of CO, CO2, H2O and methanol on the Cu/ZnO/Al2O3 - ZrO2 catalysts as well as their activity in the synthesis of methanol from CO2 and H2 were investigated. (
  • A partial substitution of Al2O3 by ZrO2 evidently decreases the reversible adsorption of water and CO. A correlation between adsorptive and catalytic properties has been established.With increasing ratio of reversibleCO2/CO orCH3OH/H2Oadsorption, an increase of the catalysts activity in the synthesis of methanol from CO2 and H2 is observed. (
  • The adsorption of the cationic surfactant, cetyltrimethylammonium chloride (CTMA) from aqueous solutions on attapulgite was studied. (
  • In the present work the adsorption capacity of CTMA on attapulgite was found that was high and was mostly due to ion exchange mechanism. (
  • Pomace wastes from the winery are widely available and a source of cell wall material, and the identification of varieties whose pomace cell walls present high proanthocyanin binding capacity and of processing methods that could enhance their adsorption properties could be of great interest. (
  • the mechanically crushing and grinding can cause the destruction of imprinted sites and cavities, resulting in the irregular shape, inhomogeneous imprinting sites and eventually poor site accessibility and low adsorption capacity to the guest molecule. (
  • One way to think about the adsorption capacity is to consider a common sponge holding onto water. (
  • The adsorption ice maker with 1 m2 solar collector and 20 kg of adsorbent can provide cooling capacity equivalent to 5 to 10 kg of ice per day with respect to climate conditions. (
  • We have previously described a completely non-motile A. brasilense mutant (Sp7 p90D084), and shown that this mutant has a drastically reduced adsorption capacity to wheat roots. (
  • Like Sp7 p90D084, these mutants show a severely reduced adsorption capacity to wheat roots. (
  • The adsorption capacity for toluene of sonicated fibers and bleached eucalyptus pulp was measured by ultraviolet spectroscopy. (
  • The adsorption capacity of bleached eucalyptus pulp was 36 μmol/g, while sonicated fibres at 30 W and 20 hours increased the adsorption by 47% and at 50 W and 20 h increased it by 67% compared with untreated fibres. (
  • The adsorption capacity studies showed that the treatment with ultrasound improved the retention capacity of the fibres, increasing considerably the adsorption capacity when the fiber width approached the nanoscale. (
  • The research team believes the following reasons support the oxidation-adsorption-defluorination treatment train. (
  • PFAS defluorination results show high promise) and systematic knowledge (e.g., adsorption theory and oxidation mechanism guiding the treatment chain design). (
  • Two Little Fishies CDX Carbon Dioxide Adsorption Media helps maintain and elevate aquarium pH by removing CO2 (carbon dioxide) introduced through a protein skimmer. (
  • These results proved that PES membranes were modified successfully with hydrophilic polymers and showed more hydrophilic property and lower protein adsorption. (
  • They are the F (fusion) protein, which is responsible for fusion of virus and host cell membranes, viral penetration, and hemolysis, and the HA (hemagglutinin) protein, which is responsible for adsorption of virus to cells. (
  • We also describe a new timescale for diffusion, which better describes the adsorption of surfactants onto spherical interfaces. (
  • Modeling association and adsorption of surfactants. (
  • The adsorption of dodecyl single chain surfactants with primary, secondary, tertiary, and quaternary ammonium headgroups at the muscovite mica basal plane-water interface has been investigated using a flat plate streaming potential apparatus and atomic force microscopy (AFM). (
  • This paper discusses the characteristics of methane replacement by using pure CO2, the synthesized flue gas and the effect of SO2 on adsorption properties of coal. (
  • The results will consist on different adsorptions properties , characteristics of the studied material as well as possible efficiency on fuel cell. (
  • IMSEAR at SEARO: Adsorption characteristics of bile salts at toluene-water interface. (
  • Alumina powder is impregnated with cobalt in the concentration range 5% to 20% (w/v) and is characterized by nitrogen adsorption at 77 K by continuous flow method using the Quantasorb sorption system. (
  • The dilatation experiments reveal that the number of adsorbed anchors remains constant in the case of chains with low grafting density while chains with the highest degree of grafting seem to show some degree of adsorption during the dilatation. (
  • Note 1: Adsorption of proteins is of great importance when a material is in contact with blood or body fluids. (
  • Experimental data on a solar-powered ice maker using activated carbon and methanol adsorption pair, J. Solar Energy Eng. (
  • It has been found that catalysts obtained by using citric acid as complexing agent show higher adsorption of methanol compared to water than the catalysts obtained by the coprecipitation. (
  • Methanol is the best working fluid for adsorption temperatures below 28 °C and ethanol is the best working fluid for above 28 °C. The thickness of the bed is calculated to a maximum of 7.5 cm to have a required cooling time. (
  • The presence of water solvent affected the diffusion of the methanol that led to a different adsorption phenomenon than in the gas phase due to ever-changing water configurations. (
  • The molecular dynamics simulation was first carried out to track the motions of the methanol molecule, and then a Continuous-Time Random-Walk mathematical model was used to model its trajectory, where different diffusion and adsorption states were extracted from the model. (
  • As a result, the energetic centers of the now partially occupied LUMO levels are located at energies below the Fermi level with a shift of about 160 meV between the two adsorption geometries [4] . (
  • The adsorption energy for an additional helium atom is about 40% less than for atoms in the commensurate layer, similar to our previous findings for fullerene cations and in agreement with theoretical dissociation energies. (
  • Sorptive selectivity of melamine-resorcinol-formaldehyde xerogels, towards CO2, CH4, N2 and H2, is reported, where all systems demonstrate potential for selective adsorption of CO2 from corresponding binary gas mixtures. (
  • Due to the economic and energy consideration, this chemical adsorption method was chosen over the preference of other conventional technologies, such as membrane separation. (
  • The research estimates global Adsorption Equipment market revenues in 2022, considering the Adsorption Equipment market prices, Adsorption Equipment production, supply, demand, and Adsorption Equipment trade and logistics across regions. (
  • Detailed market share statistics, penetration, and shift in demand for different types, applications, and geographies in the Adsorption Equipment market from 2022 to 2030 are included in the thorough research. (
  • The report covers North America, Europe, Asia Pacific, Middle East, Africa, and LATAM/South and Central America Adsorption Equipment market statistics, along with Adsorption Equipment CAGR Market Growth Rates from 2022 to 2030 will provide a deep understanding and projection of the market. (
  • The as-synthesized core-shell nanomaterials (SiO 2 @MIP2) were then evaluated for selective adsorption of 17β-estradiol (E2) with Raman spectra as detection method. (
  • Host-Guest Interaction Dictated Selective Adsorption and Fluorescence " by Dan Liu, Xiaojuan Liu et al. (
  • Desolvated compound 1a can be used as an absorbent for selective adsorption and separation of liquid explosives, including nitroaromatic (nitrobenzene (NB)) and nitroaliphatic (nitromethane (NM) and nitroethane (NE)) compounds, through single crystal-to-single crystal (SC-SC) transformations. (
  • On the basis of single crystal analysis, we provide direct evidence that both the selective adsorption and fluorescence quenching of the desolvated compound 1a are dictated by host-guest interactions between guest liquid explosives and the host framework. (
  • The method is based on selective adsorption of Azure B, a basic dye, onto acidic hydroxyl groups of lignin. (
  • Calculation of adsorption energy dispersion σ E allows to compare heterogeneities of various adsorption systems. (
  • In fact even if the energy distribution functions in question differ in symmetry etc. but available adsorption data cover only a section of coverage range (it also corresponds to a section of energy distribution) parameters assessed in such a way may still be useful. (
  • Adsorption experiments were carried out on the modified biochars to remove tetracycline (TC) from aqueous solution. (
  • To better link the simulations and the experiments, we investigated the expression of the excess adsorption amount and the reasonability of selecting the critical parameters by performing the GCMC simulations of CH4 in the Na-Montmorillonite simulation cell with the pore size of 4 nm at the temperature of 90 °C under varying pressures. (
  • We expect the findings are useful in the further investigation on the shale gas adsorption mechanisms by combing the GCMC simulations and the adsorption experiments. (
  • Column experiments with organic model compounds proved the efficacy of ACC deposits on sediment for contaminant adsorption and retardation under flow-through conditions. (
  • This site provides databases of adsorption experiments and adsorbent materials that were compiled by the National Institute of Standards and Technology (NIST). (
  • TIGG offers a complete line of liquid phase and vapor phase granular activated carbon (GAC) adsorption systems and equipment. (
  • Adsorption using powdered or granular activated carbon (PAC, GAC) is an advanced treatment for the removal of organic micro-pollutants (OMP) from waters like drinking waters (DW) or wastewater treatment plant (WWTP) effluents. (
  • Ancillary equipment used to augment TIGG's adsorption and filtration vessels is often part of the total package required for success. (
  • TIGG's experienced staff understands that ancillary equipment for liquid and vapor phase adsorption and filtration such as piping, pumps, activated carbon bed breakthrough indicators, and multimedia filters are integral to our clients' overall success. (
  • The effect of coupled plasma filtration adsorption (CPFA) for the treatment of sepsis or septic shock is controversial. (
  • Theoretically, extracorporeal therapies can be used to remove septic mediators from the bloodstream of critically ill patients [ 13 ], coupled plasma filtration adsorption (CPFA) is one such technology. (
  • Adsorption has been recognized as an effective and promising technique and has been used in tertiary water and wastewater treatment. (
  • The article discusses the problem of industrial wastewater treatment using adsorption. (
  • In this study, graphene nanoplate/natural zeolite/sodium alginate bio-composite adsorbent was prepared and copper removal from wastewater by adsorption method was investigated. (
  • In chemical adsorption, a chemical bond is created between the adsorbate and adsorbent. (
  • Finally, we determined the mechanism of how radical adsorption improves the thermal stability of the aggregates. (
  • This mechanism can hinder chemical adsorption, with an effect that crucially depends on the actual metal substrate. (
  • The result suggested that KOH modification of biochar from a low pyrolysis temperature can enhance TC adsorption and can be used over a wide range of pH, which may be a good choice for disposal of organic pollutants in aqueous solution. (
  • Third, oxidative pretreatment is highly beneficial because it may (i) remove organic co-occurring chemicals, (ii) eliminate organic co-occurring chemical competition during PFAS adsorption, and (iii) convert recalcitrant PFAS to labile PFAS for enhanced defluorination. (
  • This blog will provide you with a high level description and review of adsorption as an air pollution control technology for organic pollutants. (
  • To cool the desiccant and ensure it is at the optimum temperature for adsorption, the heat source is simply removed, and the desiccant cooled to ambient temperature. (
  • Technical Overview A lab-scaled prototype adsorption desalination (AD) plant, that employs low temperature waste heat to operate the AD Cycle, has been successfully tested in NUS. (
  • The figure above shows the DSC- measurement-part of the adsorption of Hydrogen on a Pt/Al catalyst at a pressure of 15 bar and a temperature of 80°C. The evolved heat is 30,5 J/g. (
  • Using ozonation prior to PAC, the aromaticity and hydrophobicity of BOM were shown to crucially impact OMP adsorption. (
  • The efficiency of the electrotransfer depends crucially on the adsorption of the gene DNA and oligonucleotides to the plasma cell membranes. (
  • In the SPR measurement, non-specific adsorption should be controlled because SPR sensor cannot discriminate between specific and non-specific adsorption. (