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Sorption isotherms collected from tables in the seminal dissertation, "The Thermodynamics and Hysteresis of Adsorption" by A. J. Brown, have been digitized and made publicly available, along with supporting software scripts that facilitates usage of the data. (nist.gov)
The isotherms include laboratory measurements of xenon, krypton, and carbon dioxide adsorption (and, when possible, desorption) isotherms on a single sample of Vycor glass, at various temperatures including subcritical conditions for xenon and krypton. (nist.gov)
The highlight of this dataset is the collection of "scanning" isotherms for xenon on Vycor at 131 K. The scanning isotherms examine numerous trajectories through the adsorption-desorption hysteresis region, such as primary adsorption and desorption scanning isotherms that terminate at the hysteresis boundary, secondary scanning isotherms made by selective reversals that return to the boundary, and closed scanning loops. (nist.gov)
Despite the very small value of the conical angle α , estimated to be ∼0.06°, just barely above α = 0° corresponding to a cylindrical pore, the adsorption isotherms look strikingly different from those measured on cylindrical pores of similar size. (rsc.org)
Physical adsorption isotherms were experimentally determined for these engineered proteins, allowing for direct calculation of the available ligand density present on coated surfaces. (frontiersin.org)
The aim of this research is to measure the adsorption/desorption isotherms of single-component gases on activated carbon in a series of pressure steps up to 1500 psi. (onepetro.org)
As the density of the matrix layer increases, the adsorption isotherms pass from wetting to a prewetting transition, and, if the layer is dense enough, to partial wetting. (byu.edu)
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. (wikipedia.org)
The experimental isotherms and the computed enthalpies of adsorption are compared with those of various researchers and found to be consistent with a chiller manufacturer's data. (nus.edu.sg)

ABSTRACT: Methane adsorption by different forms of activated carbon obtained from coffee husks, including monolith honeycomb and disc types, was studied by activation with zinc salts and potassium hydroxide at 298.15 K and 303.15 K and pressures up to 30.00 atm in a volumetric adsorption apparatus. (scirp.org)
ENGLISH ABSTRACT: Adsorption tests were conducted with four different ion-exchange resins to determine the equilibrium adsorption of a range of precious and base metals. (sun.ac.za)

The variables that determine the adsorption quantities were identified. (sun.ac.za)

To date, most adsorption/desorption experimental work has been conducted on methane, carbon dioxide, and nitrogen. (onepetro.org)
We observed increased methane adsorption capacity on a mass basis in the different activated carbon monoliths with increasing surface area, total pore volume and micropore volume, with the honeycomb type displaying the highest methane absorption capacity. (scirp.org)
Results indicate that a number of the primary carbon/resin materials demonstrate efficient adsorption of the cytokines studied here (TNF, IL-6 and IL-8), comparable to other adsorbents under clinical investigation. (strath.ac.uk)
This capability will enable the engineering of the carbon matrix porosity allowing a blend of carbonised particle combinations to be tailored for maximum adsorption of inflammatory cytokines. (strath.ac.uk)
These carbon materials present CO 2 adsorption capacities, at 25°C and 101.3 kPa, comparable to those obtained by other complex carbon or inorganic materials. (frontiersin.org)
Moreover, the adsorption capacity of this carbon fiber was totally recovered in a very fast desorption cycle at the same operation temperature and total pressure and, therefore, without any additional energy requirement. (frontiersin.org)
Carbon materials have been extensively employed for adsorption applications in many areas due to their high specific surface areas, remarkable mechanical, thermal, and chemical stabilities, and relatively easy to tailor porous structure and chemical surface. (frontiersin.org)
On the other hand, activated carbon materials are usually adversely compared in terms of CO 2 adsorption capacity and/or selectivity. (frontiersin.org)
An adsorbent used by the adsorption tower in the invention is one of coconut casing active carbon zeolite molecular sieve and MOF, which can enrich coal mine ventilation air methane by low energy consumption, realize utilization of methane in the ventilation air methane and reduce discharge of greenhouse gas. (google.com)
The invention can be used for enriching and concentrating of other gas enriched with strong adsorption ingredient, such as methane, carbon dioxide and carbon monoxide, etc. (google.com)
The invention belongs to transformation adsorbed gas separation field, relate to a kind of coal mine wind-lack gas and put forward dense method, the multitower vacuum pressure swing adsorption process that can be used for the enrichment of strong absorbed component gas such as methane, carbon dioxide is carried the method and the device of dense coal mine wind-lack gas. (google.com)
Carbon-based adsorbents possess exceptional adsorption capability, making them an ideal platform for the remediation of environmental contaminants. (springeropen.com)

Therefore, this engineered protein adsorption approach allows for the facile preparation of tunable, quantifiable, and reproducible surfaces for in vitro studies of cell-ligand interactions and for potential application as coatings on neural implants. (frontiersin.org)
Among biomolecules , protein adsorption to surfaces poses a unique challenge, apparent through the plethora of attention in the literature [ 13 - 18 ]. (omicsonline.org)

Two primary adsorption sites are experimentally identified from N 2 dissociation on Fe 3 O 4 (001). (mtu.edu)

They consist of a selective medium for the preferred adsorption of methane and ethane over hydrogen. (wikipedia.org)

Adsorption and desorption characteristics of cadmium and arsenic in six kinds of parent material-developed paddy soils in Hunan. (cabi.org)
The adsorption and desorption characteristics and influencing factors of cadmium and arsenic were investigated in paddy soils derived from six typical parent materials from Hunan, using single element equilibrium method. (cabi.org)

The WTR nanoparticles demonstrated high removal efficiency for Cd from aqueous solution as the adsorption capacities of nWTR were 17 and 10 times higher than those of bulk WTR in single- and multielement systems, respectively. (hindawi.com)
In contrast, CO 2 adsorption capacities at 25°C and 15 kPa are more related to only pores of sizes lower than 0.7 nm. (frontiersin.org)

Pressure swing adsorption (PSA) is a technique used to separate some gas species from a mixture of gases (typically air) under pressure according to the species' molecular characteristics and affinity for an adsorbent material. (wikipedia.org)
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. (nus.edu.sg)
The adsorption characteristics were determined for synthetic single metal, as well as for multicomponent and base metal solutions. (sun.ac.za)
From the ion-exchange characteristics determined, a selective adsorption sequence is proposed for the separation of precious and base metals. (sun.ac.za)

The adsorption of lysozyme to hydrophilic silicon oxide surfaces: comparison between experimental data and models for adsorption kinetics. (lu.se)

Adsorption on porous solids depends on the morphology of the pores, the cylindrical one being the most studied in the literature. (rsc.org)
In the mid-term, post-combustion CCS and, especially post-combustion using adsorption over porous solids seems to be called to play an important role. (frontiersin.org)

Little Goose Creek, Goose Creek, and the Tongue River in the Tongue River drainage basin, and Clear Creek in the Powder River drainage basin, which have headwaters in the Bighorn Mountains, consistently had the smallest median dissolved-sodium concentrations, sodium-adsorption ratios, dissolved-sulfate concentrations, and dissolved-solids concentrations. (usgs.gov)

The objectives of this study were therefore (i) to determine cadmium adsorption capacity of water treatment residual nanoparticles and to investigate the pertinent adsorption mechanism and (ii) to study the effects of operational parameters including adsorbent dosages, solution pH, and competing cations on the removal of Cd by nWTRs. (hindawi.com)
The adsorption of Fe (III) ions on CTPP beads was found to be dependent on operating conditions, such as the flow rate, adsorbent bed length, and feed concentration. (iwaponline.com)
Adsorption calorimetry results were used to describe the interaction between guest molecules and the adsorbent at low surface coverage and the energetic heterogeneous surface nature of the adsorbent. (scirp.org)
[3] While adsorption does often precede absorption, which involves the transfer of the absorbate into the volume of the absorbent material, alternatively, adsorption is distinctly a surface phenomenon, wherein the adsorbate does not penetrate through the material surface and into the bulk of the adsorbent. (wikipedia.org)

In order to determine if phosphate ion adsorption is affected by the type of cation adsorbed on the clay, samples or hydrogen saturated, phosphated montmorillonite were titrated to the equivalence point with sodium hydroxide, potassium hydroxide, and lithium hydroxide. (byu.edu)
It was concluded that phosphate ion adsorption is not a function of the type of cation (hydrogen ion, sodium ion, potassium ion, lithium ion) adsorbed by montmorillonite. (byu.edu)
Density functional theory calculations explain our observations on the identity and concentration of alkali cations on the non-Nernstian pH shift, and provide definite proof that cation-hydroxyl co-adsorption causes the apparent pH dependence of "hydrogen" adsorption in the step sites of platinum electrodes. (nist.gov)

In this work, we present the first experimental investigation of adsorption and evaporation on conical nanopores produced by anodization of aluminium oxide. (rsc.org)
The Adams-Bohart model presented a good fit to the experimental data, showing that external mass transfer was controlling the adsorption process in the initial part of the breakthrough curves. (iwaponline.com)

Though the gas adsorbed on these surfaces may consist of a layer only one or at most a few molecules thickness, surface areas of several hundred square meters per gram enable the adsorption of a large portion of the adsorbent's weight in gas. (wikipedia.org)
Hydrophobic interactions can cause biomolecules to aggregate, and also play a major role in biomolecular adsorption from water onto hydrophobic surfaces [ 11 , 12 ]. (omicsonline.org)
However, little is known about N 2 adsorption on other iron-based materials, such as iron oxide surfaces that are ubiquitous in soils, steel pipelines, and other industrial materials. (mtu.edu)

Irving Langmuir was the first to derive a scientifically based adsorption isotherm in 1918. (wikipedia.org)
It is the most common isotherm equation to use due to its simplicity and its ability to fit a variety of adsorption data. (wikipedia.org)

Brunauer, Emmett and Teller's model of multilayer adsorption is a random distribution of molecules on the material surface. (wikipedia.org)

The study reported in this thesis was carried out to gain an understanding of the mechanism of phosphate ion adsorption by the clays montmorillonite and kaolinite. (byu.edu)
To test the theory of phosphate ion adsorption by kaolinite that was proposed by Stout^2 and Kelley and Midgley^3, in which the surface layer of hydroxyl ions in the kaolinite lattice are considered to be exchangeable with phosphate ions, phosphated kaolinite was treated with varying amounts of sodium hydroxide and the solution in equilibrium with the clay was analysed for phosphate ions. (byu.edu)
Failure of adsorbed phosphate ions to exchange with any of these anions was interpreted as meaning that phosphate ion adsorption by montmorillonite and kaolinite is not a physical adsorption, but rather a specific chemical reaction. (byu.edu)
The hypothesis that phosphate ion adsorption by clays is a chemical precipitation of aluminum phosphate both by aluminum ions in solution (from dissolution of the clay) and aluminum ions exposed on the broken edges of montmorillonite and kaolinite crystals was proposed. (byu.edu)
Phosphate adsorption was significantly less in seawater, and more phosphorus was desorbed in the seawater compared to the DIW. (usda.gov)

Moreover, conclusive evidences have demonstrated that the smaller size fraction of WTRs greatly increases their active surface area and adsorption performance [ 13 ]. (hindawi.com)
It has been established that a higher platinum concentration increases the adsorption quantity of gold on XAD7 resin. (sun.ac.za)

Therefore, appropriate adsorbents must present sufficient adsorption capacity, high CO 2 selectivity, adequate density and hardness, low abrasion index, and good stability in moisture conditions. (frontiersin.org)

Due to the aforementioned irreversibilities, by using adsorption metrics to quantify the amount of gas desorbed within the reservoir, gas production may be overestimated. (onepetro.org)

The greater adsorption capacity of water treatment residuals nanoparticles (nWTRs) in comparison with larger particles suggests their use as a very promising candidate for contaminated water and wastewater remediation. (hindawi.com)
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. (wikipedia.org)

The efficiency of adsorption of the target molecules from human plasma was assessed and compared to that of Adsorba® 300C, a commercially available cellulose-coated activated charcoal. (strath.ac.uk)
Adsorption is the adhesion [1] of atoms , ions or molecules from a gas, liquid or dissolved solid to a surface . (wikipedia.org)

By having accurate adsorption/desorption data of injected and reservoir gases, one can acquire a better understanding of the true original gas in place, as well as how to maximize production through optimal enhanced gas recovery (EGR) techniques. (onepetro.org)
A semi‒pilot-scale adsorption reactor was fabricated to remove a volatile organic compound (VOC) gases mixture (BTEX). (aaqr.org)

Data points for adsorption curves were established by varying the amount of resin added to the test solution of a specific concentration. (sun.ac.za)
All adsorption data, obtained for a resin (typically 250 equilibrium data points), was used in the development of the model. (sun.ac.za)
In batch adsorption tests the counter ion is not removed from the resin. (sun.ac.za)

Adsorption is present in many natural, physical, biological and chemical systems and is widely used in industrial applications such as heterogeneous catalysts , [8] [9] 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 . (wikipedia.org)
For all of the anion resins, XAD7, IRA900, and A22, the chloride concentration of the solution did not have a big effect on the adsorption capacity. (sun.ac.za)

The parameters obtained from the continuous adsorption assays may be used as a basis for designing columns packed with CTPP beads for the removal of Fe (III) ions. (iwaponline.com)

The results demonstrated that the EC/PS adsorption coupling method achieved a reduction of 94% UED and UEMD compared with EC process. (iwaponline.com)
However, the adsorption of base metals on IR200 is sensitive to chloride concentration, with a rapid reduction in adsorption at higher chloride concentrations. (sun.ac.za)

This research aims to expand on previous literature by performing adsorption/desorption experiments on higher chain hydrocarbons, such as ethane and propane. (onepetro.org)
The capacity values obtained in column adsorption experiments were really promising. (frontiersin.org)

Nickel and cobalt are then leached in ammoniacal solution but some losses occur due to adsorption and co-precipitation with iron oxide or hydroxide precipitates. (ubc.ca)

The main form of Cd in contaminated water is Cd(II) and the remediation technologies available to reduce Cd concentrations in contaminated water systems include ion-exchange, solvent extraction, chemical precipitation, phytoextraction, ultrafiltration, reverse osmosis, electrodialysis, and adsorption [ 3 - 6 ]. (hindawi.com)

Fourier transmission infrared (FTIR) analyses suggested the participation of OH − , O-Al-O, FeOH, and FeOOH entities in the adsorption process. (hindawi.com)
The adsorption-desorption process was performed for five successive cycles. (aaqr.org)
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). (wikipedia.org)
after raw material gas is adsorbed by an adsorption tower, high pressure gas flowing out of an exhaust end of the adsorption tower enters to a next adsorption tower for adsorption, so as to completely move mass a transfer zone out of the adsorption tower during the adsorption process and increase product gas volume fraction. (google.com)
As such, the adsorption models are only valid for the initial part of the ion-exchange process. (sun.ac.za)

It is important to quantify both adsorption and desorption processes because in EGR techniques such as cyclic solvent injection (CSI) injected gas is competitively adsorbing onto the rock, causing the adsorbed reservoir gas to be displaced, desorb, and subsequently be produced. (onepetro.org)

Investigation of N2 adsorption on Fe3O4(001) using ambient pressure X-" by Gemechis Degaga, Mikhail Trought et al. (mtu.edu)

Para la elaboración de este artículo de revisión narrativa se consultaron las publicaciones disponibles a neutrófilos en el través de una búsqueda automatizada en las bases de datos de PubMed, Scopus y Embase. (bvsalud.org)

A straightforward way to control protein surface adsorption is to use buffers at pH extremes, to either operate above the isoelectric point of proteins, or suppress ionization of silanol groups at the channel walls [ 10 , 21 ]. (omicsonline.org)

Occupational exposure may occur through both inhalation and dermal adsorption during the manufacture of atrazine, its formulation, and its application. (who.int)

In the case of oxygen generation a zeolite-based sieve forces preferential adsorption for nitrogen. (wikipedia.org)

Virus was concentrated by using an adsorption-elution-ultrafiltration filtration protocol ( 4 ). (cdc.gov)

The effect of the el- concentration on the equilibrium adsorption was established for three different Hel concentrations in the above solutions. (sun.ac.za)
For each precious metal the equilibrium adsorption was determined for a couple of solution concentrations. (sun.ac.za)
High solution concentrations of the target adsorption component increase the adsorption quantity. (sun.ac.za)
However, the adsorption quantity is reduced at higher ruthenium concentrations. (sun.ac.za)
The adsorption quantity of palladium on A22 is increased by the presence of rhodium and decreased by larger concentrations of iridium and platinum. (sun.ac.za)
The adsorption of base metals on IR200 is decreased at higher acid concentrations. (sun.ac.za)
Higher concentrations of gold in the base metal solution also decrease the adsorption quantity of base metals. (sun.ac.za)

We study the adsorption, including wetting, of a Lennard-Jones gas on a rough surface consisting of rough layer on a smooth substrate with which the gas interacts via a 9-3 potential. (byu.edu)

The highest adsorption of cobalt (99%) was obtained with an initial concentration of 0.2 M ferrous sulfate at pH 7 after 2 hours of contact time. (ubc.ca)
The adsorption quantity of iridium on IRA900 is reduced with increased rhodium concentration. (sun.ac.za)
This concentration is 2 ppm, collected by charcoal adsorption from a 45 liter air sample over a period not to exceed 1 hour, followed by gas chromatographic analysis. (cdc.gov)

Furthermore, by plotting pressure divided by adsorption capacity as a function of pressure, Langmuir parameters are determined. (onepetro.org)

Through digital preservation and release of the tables from Brown's dissertation, these data are now more easily accessible and can continue to find use in developing models of adsorption for fundamental and practical applications. (nist.gov)
Data for general hydrology, field measurements, major-ion chemistry, and selected trace elements were summarized, and specific conductance and sodium-adsorption ratios were evaluated for relations with streamflow and seasonal variability. (usgs.gov)

The HBPI-CR networks exhibited a BET surface area (385-497 m 2 g −1 ) as well as a comparable CO 2 uptake (1.65-2.04 mmol g −1 at 273 K and 1 bar) and enthalpy of adsorption (28.6-30.0 kJ mol −1 ) to that of other microporous polyimides derived from rigid tri-dimensional monomers. (rsc.org)
As more research focuses on medical and diagnostic applications involving micro- and nanofluidic devices, the issue of non-specific adsorption of biomolecules at the channel surface is gaining increasing attention [ 5 - 7 ]. (omicsonline.org)
Like surface tension , adsorption is a consequence of surface energy . (wikipedia.org)

Pressure swing adsorption (PSA) incorporates a material called molecular sieve for gas separation. (wikipedia.org)

Organisms2

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