• activated carbon
  • Cryo-adsorption is a method used for hydrogen storage where gaseous hydrogen at cryogenic temperatures (150 - 60 K) is physically adsorbed on porous material, mostly activated carbon. (wikipedia.org)
  • This paper proposes a new approach for the performance analysis of a single-stage solar adsorption refrigeration system with activated carbon-R134a as working pair. (hindawi.com)
  • In the present research study, we make an attempt to understand the physical adsorption of mercuric chloride and mixture of mercuric chloride and nitrogen in zeolite-X and activated carbon through detailed Monte-Carlo simulations and computational quantum chemistry techniques. (nsti.org)
  • The adsorption of binary mixture (N2-HgCl2) is simulated in both types of micropores adsorbents at different HgCl2 concentrations ranging from 5000 ppbv to 10 ppbv in the temperature range of 100 to 180 C. Finally, the selectivity of HgCl2 with respect to N2 is discussed in zeolite-X and as a function of pore size, acid sites concentrations and their relative positions within pore in the case of activated carbon. (nsti.org)
  • The adsorptive media addressed include granular activated carbon and other alternative adsorption carbon media, such as powdered activated carbon (PAC) and non-carbon adsorbents. (cpeo.org)
  • gases
  • Pressure swing adsorption (PSA) is a technology used to separate some gas species from a mixture of gases under pressure according to the species' molecular characteristics and affinity for an adsorbent material. (wikipedia.org)
  • In such a context, research in adsorption of gases by carbon nanomaterials has experienced considerable growth in recent years, with increasing interest for practical applications. (worldcat.org)
  • Topics receiving special attention in this book include storage of H, purification of H, storage of rare gases, adsorption of organic vapors, gas trapping and separation, and metrology of gas adsorption. (worldcat.org)
  • The consumption of low grade energy by the adsorption units does not possess any problems of emission of greenhouse gases. (hindawi.com)
  • oxide
  • Iron oxide adsorption is a water treatment process that is used to remove arsenic from drinking water. (wikipedia.org)
  • Iron oxide adsorption treatment for arsenic in groundwater is a commonly practiced removal process which involves the chemical treatment of arsenic species such that they adsorb onto iron oxides and create larger particles that may be filtered out of the water stream. (wikipedia.org)
  • The adsorption of phosphonylated polyphenylene oxide onto hydroxyapatite was investigated as a basis for biomedical applications involving surface modification of teeth and bone. (springer.com)
  • Chemical pretreatment to remove noncrystalline and crystalline oxide contaminants affected the magnitude of CrO 4 2- adsorption, but not the pH range over which CrO 4 2- adsorbed. (clays.org)
  • The adsorption of both chromate and sulfate can be described in terms of a site-binding model of the kaolinite edge, in which the edge is viewed as composite layers of Al and Si oxide. (clays.org)
  • processes
  • 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)
  • displaystyle
  • T c {\displaystyle T_{c}} is the critical temperature) Observations of supercritical adsorption reported before 1930 was covered in studies by McBain and Britton. (wikipedia.org)
  • The volume of the connecting tube between the adsorption cell and valve is divided into two parts: one part with volume V t {\displaystyle V_{t}} with same temperature as the reference cell. (wikipedia.org)
  • The formula for calculating the sodium adsorption ratio (SAR) is: SAR = N a + 1 2 ( C a 2 + + M g 2 + ) {\displaystyle {\text{SAR}}={\frac {Na^{+}}{\sqrt {{\tfrac {1}{2}}({Ca^{2+}+Mg^{2+}})}}}} where sodium, calcium, and magnesium concentrations are expressed in milliequivalents/liter. (wikipedia.org)
  • In the case of pronounced adsorption it is advisable to choose x ′ {\displaystyle x'} close to the right border of the transition region. (wikipedia.org)
  • solvent
  • The primary mechanisms by which the solvent affects the adsorption characteristics of the surface-polymer interface are the dielectric effect of the solvent, the steric attraction or repulsion facilitated by the chemical nature of or species in the solvent, and its temperature. (wikipedia.org)
  • energies
  • The selective adsorption binding energies can supply information on the gas-surface interaction potentials by yielding the vibrational energy spectrum of the gas atom bound to the surface. (wikipedia.org)
  • We find that GLYCAM06 gives a good account of geometries and, in most cases, accurate adsorption energies when compared to dispersion-corrected DFT energies. (warwick.ac.uk)
  • Especially for bigger adsorbates, a neglect of these interactions leads to a dramatic underestimation of adsorption energies. (warwick.ac.uk)
  • adsorbent
  • It basically comprises a gas expansion process from a storage vessel (reference cell) to an adsorption chamber including adsorbent (adsorption cell) through a controlling valve C, as schematically shown in Figure 1. (wikipedia.org)
  • A dry and degassed adsorbent sample of known weight was enclosed in the adsorption cell. (wikipedia.org)
  • The disadvantage of volumetric measurements is the considerable amount of adsorbent sample needed to overcome adsorption effects on the walls of the vessels. (wikipedia.org)
  • Polluted effluent is added into the bottom of the cell and mixed with the adsorbent in the adsorption zone 1.1 where adsorption of the pollutants onto the surface of the adsorbent occurs. (wikipedia.org)
  • HCl lowers pH, assuring arsenic adsorption, and the disassociated chlorine oxidizes iron in solution from Fe+2 to Fe+3, which then may bond with hydroxide ions, OH−, thus creating more adsorbent. (wikipedia.org)
  • Pressure swing adsorption (PSA) separation of a gas mixture is performed in an apparatus with a plurality of adsorbent beds. (google.com)
  • solids
  • The need to develop technologies capable of achieving high removal efficiencies for mercury chloride emission control led many researchers to focus their attention on the evaluation of the adsorption capacity and selectivity shown by different solids. (nsti.org)
  • mechanism
  • This fundamental law determines the different adsorption mechanism for the subcritical and supercritical regions. (wikipedia.org)
  • These results can be explained by an adsorption mechanism that is controlled by the degree of charge neutralization along the polymer chain. (springer.com)
  • refers
  • Random sequential adsorption (RSA) refers to a process where particles are randomly introduced in a system, and if they do not overlap any previously adsorbed particle, they adsorb and remain fixed for the rest of the process. (wikipedia.org)
  • organic
  • It provides practical guidance for the design of liquid- and vapor-phase devices for the adsorption of organic chemicals. (cpeo.org)
  • different
  • Chromate adsorption at different sorbate and sorbent concentrations increased below the pH zpc for the kaolinite edge, suggesting the formation of weak surface complexes. (clays.org)
  • One of the main strategies for removal of pesticides from water is the adsorption on different types of materials [ 5 ]. (hindawi.com)
  • forces
  • 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)
  • Driving Forces for DNA Adsorption to Silica in Perchlorate Solutions. (wikipedia.org)
  • case
  • NaOCl is usually added for disinfection although it may be used in this case towards the objectives of a distribution system free chlorine residual of 1 mg/L and the oxidation of aqueous As(III) to As(V), and aqueous iron Fe+2 to Fe+3, which will bond with hydroxide for further adsorption. (wikipedia.org)
  • From a consideration of this order and of the absolute amount of adsorption in each case we find very little reason to place much credence in Schulze's law. (rice.edu)
  • Excessive adsorption, or protein fouling, can lead to health and sanitation issues, as the adsorbed protein is very difficult to clean and can harbor bacteria, as is the case in biofilms. (wikipedia.org)
  • Graphical representation of the results obtained in case when adsorption data is collected in repeated experiments is presented in Supplementary material. (hindawi.com)
  • process
  • 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. (wikipedia.org)
  • The blocking process has been studied in detail in terms of the random sequential adsorption (RSA) model. (wikipedia.org)
  • Adsorption/bio-oxidation process was invented in the mid-1970s by the professor of the RWTH Aachen University Botho Böhnke. (wikipedia.org)
  • In 1977 Böhnke published his first article on adsorption/bio-oxidation process. (wikipedia.org)
  • The A-stage, or adsorption stage is the most innovative component of the process. (wikipedia.org)
  • capacity
  • Elevated temperatures from soil vapor extraction (SVE) pumps (greater than 38 C or 100 F) inhibit adsorption capacity. (cpeo.org)
  • Adsorption capacity detected for nanospheres is 456 mg/g and for nanorods is 57.1 mg/g. (hindawi.com)
  • suitable
  • Although SAR is only one factor in determining the suitability of water for irrigation, in general, the higher the sodium adsorption ratio, the less suitable the water is for irrigation. (wikipedia.org)
  • efficiency
  • As a result of its properties Nyex can undergo quick adsorption and fast electrochemical regeneration in a combined adsorption-electrochemical regeneration cell achieving 100% regeneration efficiency. (wikipedia.org)
  • research
  • During the last 20 years, a growing interest in supercritical adsorption research under the impetus of the quest for clean alternative fuels has been observed. (wikipedia.org)
  • Many research groups are now producing or using such materials for gas adsorption, storage, purification, and sensing. (worldcat.org)
  • This book provides a selected overview of some of the most interesting scientific results regarding the outstanding properties of carbon nanomaterials for gas adsorption and of interest both for basic research and technological applications. (worldcat.org)
  • polymer
  • Intrachain charge repulsion results in an extended random-coil conformation and adsorption in a thin layer with binding at many polymer sites. (springer.com)
  • sites
  • A collapsed conformation occupies only a relatively few binding sites and thus adsorption results in the formation of a thick layer. (springer.com)
  • Adsorption increased with decreasing pH because of protonation of chromate and/or variable charge sites on kaolinite. (clays.org)
  • Surface complexation constants for CrO 4 2- on kaolinite were similar to those for alumina, pointing to the importance of Al-OH edge sites in chromate adsorption. (clays.org)
  • water
  • Adsorption refrigerators are available in the marketplace and are mainly used to produce chilled water from waste heat. (wikipedia.org)
  • The Sodium adsorption ratio (SAR) is an irrigation water quality parameter used in the management of sodium-affected soils. (wikipedia.org)
  • Irrigation using water with high sodium adsorption ratio may require soil amendments to prevent long-term damage to the soil. (wikipedia.org)