Adsorption desorption behavior

Hou, P.X., S.T. Xu, Z. Ying, Q.H. Yang, C. Liu, H.M. Cheng, Hydrogen adsorption/desorption behavior of multi-walled carbon nanotubes with different diameters. Carbon 41,2471-2476,2003. 

Adsorption-Desorption Behavior of Polyvinyl Alcohol on Polystyrene Latex Particles... 

Kenna, B. T. and F. J. Conrad. Studies of the Adsorption/Desorption Behavior of Explosive-Like Molecules. Sandia Report SAND86-0141, Sandia National Laboratories, Albuquerque, NM 1986. 

Padmanabham, M. (1983) Adsorption-desorption behavior of copper(Il) at the goethite-solution interface. Aust. J. Soil Res. 21 309-320... 

Physical and Chemical Properties. Although some of the physical and chemical properties of radium and radium compounds have not been determined, many of those that are needed to evaluate its behavior in the environment are known. The adsorption-desorption behavior of radium with geologic materials depends on the specific system under study and should be determined on a case-by-case basis. Also, thermodynamic and kinetic data for solid solution formation are scarce. Research in this area would facilitate modeling the fate of radium in water. 

Our objective is to develop the continuous adsorption process for citrus oil processing. In this work, the adsorption breakthrough curves and desorption curves were analyzed to understand the adsorption-desorption behavior of citrus oil on a silica gel adsorbent inSC-C02. Acyclic adsorption-desorption process was developed and demonstrated for the removal of terpenes from orange oil. 

Taniguchi T, Duracher D, Delair T, Elaissari A, Pichot C (2003) Adsorption/desorption behavior and covalent grafting of an antibody onto cationic amino-functionalized poly(styrene-/V-isopropyl aery I am i de) core-shell latex particles. Colloids Surf B Biointerfaces 29 53-65... 

Effect of Desiccation at Room Temperature on the Water Adsorption-Desorption Behavior of Starch420... 

A change in the hydrophilic nature of the polymer surface on irradiation of poly-(p-phenylazoacrylanilide) (PAAn) or its copolymer with HEMA may be used to control the adsorption — desorption behavior of proteins or organic substances onto the polymer [49]. Adsorption of lysozyme onto the copolymer of p-phenylazo-acrylanilide and HEMA was foimd to decrease from 4.6 eg to 1.8 eg per gram of adsorbent on ultraviolet irradiation, which induces the isomerization from the trans to the cis form. The decrease in adsorption ability upon ultraviolet irradiation is explained by a reduction of the hydrophobic interaction between the protein and the polymer, which results from the appearance of hydrophilic cw-form azobenzene on the surface. 

Chen, W., Kan, A.T., Fu, G., Vignona, L.C. and Tomson, M.B. (1999) Adsorption-desorption behaviors of hydrophobic organic compounds in sediments of Lake Charles, Louisiana, USA. Environ. Toxicol. Chem., 18, 1610-1616. 

The previous equations describing the adsorption/desorption behavior of gases lead to models describing sink effects in indoor environments. In addition, transport of molecules within the sink material can have a major impact on desorption rates thus, models accounting for internal diffusion have been developed for indoor sinks. Models based on fundamental theories are preferred over empirical approaches, but some studies rely on experimental data to fit empirical models [21-23]. 

Because of the energy of such an association, nonreversibility in adsorption-desorption behavior is both expected and observed. The association is further stabilized by entropy, since desorption requires the improbable event that two bonds be simultaneously broken. These binuclear anion-surface complexes may form slowly and decompose at an even slower rate. 

Adsorption-desorption behavior of oxygen on the SE and oxygen-sensing performance of the SE. Strong oxygen adsorption not always directly correlated to the low catalytic activity for anodic reaction V2 O2 +... 

F Blockhaus, J-M Sequaris, HD Narres, MJ Schwuger. Adsorption-desorption behavior of acrylic-maleic acid copolymer at clay minerals. J Coll Interf Sci 186 234-247, 1997. 

One laboratory approach to the study of availability is the mobility of the pesticides on soil thin-layer chromatography plates as an index of a compound s adsorption/desorption behavior. 

Desorption occurs when the pressure is decreased from the saturation pressure. Many mesoporous systems exibit distinct adsorption-desorption behaviors, which lead to a characteristic hysteresis loop. The curve shape is linked to different geometrical factors that rule the adsorption and desorption processes. The reason for this hysteresis is that capillary condensation occurs differently in adsorption and desorption. Because of the concave meniscus of the liquid in the pores, N2 evaporates at a lower relative pressure because the vapor pressure of the liquid is reduced. The lowering of the vapor pressure for a capillary of radius rk is given by the Kelvin relationship... 

Later work showed similar adsorption-desorption behavior for NACs in clay types other than kaolinite. The adsorption constant was found to increase fairly uniformly for all tested NACs in the ratio of 1 6 12 (kaolinite iUite montmoril-lonite). This ratio is quite close to the relative surface areas of the three minerals illite and montmorillonite have 6 and 16 times more available surface area, respectively, than kaolinite (Haderlein, Weissmahr, and Schwarzenbach, 1996). This observation suggests that a similar EDA complexation mechanism controls the adsorption of NACs to these minerals as well. The authors also showed that TNT,... 

From Table 9.1, another important conclusion could be drawn regarding the thickness of the studied fibrils. The microfibrils have diameters around 1 pm and that of nanofibrils is between 50 and 150 nm. The specific surface is also different for the two types of fibrils. BET analysis of the scaffolds show that the nanofibril-lar material (PET-Nano) is characterized by the highest surface area, 18.8 m g (Table 9.1). The adsorption-desorption behavior of this sample corresponds to pores of meso- and micro-size (>10nm). In contrast to the PET-Nano sample, the material comprising microfibrils possesses five times less surface area, namely, of 4m g (Table 9.1, sample PET-Micro 2), and the size of the cavities formed is in the macro-range (>50 nm). The microfibrillar PGA scaffold, which possesses larger surface area (Table 9.1) and similar pore size distribution, shows comparable behavior. 

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