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  1. 2 Open Chemistry

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  1. 2 2010

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  1. 2 Samiey B.

  2. 1 Dargahi M.

  3. 1 Golestan S.

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Adsorption of triton X-100 on silica gel: effects of temperature and alcohols

100%
Samiey B., Golestan S.
Open Chemistry
|
2010
|
vol. 8
|
issue 2
361-369
EN
Adsorption of Triton X-100 (TX-100) on silica gel has been studied as a function of temperature (308–328 K) and composition for mixtures of water with ethanol or t-butanol. The adsorption capacity of silica gel for TX-100 decreases with increase in alcohol content. Adsorption isotherms of TX-100 on silica gel are four-region and were analyzed using the ARIAN (adsorption isotherm regional analysis) model. Data in regions 2, 3 and 4 were fitted to the Temkin, bilayer and reverse desorption isotherms, respectively. The results show that adsorption of TX-100 on silica gel in water and alcohol-water binary mixtures occurs mainly through formation of monolayer surface aggregates or low bilayer coverage. [...]
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Kinetics and thermodynamics of adsorption of congo red on cellulose

100%
Samiey B., Dargahi M.
Open Chemistry
|
2010
|
vol. 8
|
issue 4
906-912
EN
Thermodynamics and kinetics of adsorption of congo red (CR) on cellulose are studied at 308–328 K. In the used concentration range of CR, interaction of CR with cellulose is exothermic and CR molecules adsorb chemically on cellulose surface. The effects of contact time, temperature and initial concentration of CR on kinetics of its adsorption on cellulose were investigated. The process proceeds according to the pseudo-second-order equation. Initial adsorption rate of adsorption is first-order in CR and the intraparticle diffusion of CR molecules within cellulose is identified as the main rate-limiting step. [...]
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