NDLI: Sorption of Cesium on Clay Colloids: Kinetic and Thermodynamic Studies

Content Provider	Springer Nature Link
Author	Deepthi Rani, R. Sasidhar, P.
Copyright Year	2012
Abstract	Sorption of radionuclides onto stable colloids can significantly enhance their transport in groundwater. Batch adsorption studies were performed to evaluate the influence of various experimental parameters like initial pH, contact time, temperature and concentration of Na+ and Ca2+ ions on the sorption of Cs on clay. The sorption process is dependent on pH of the solution with distribution coefficient (K d) found to increase with increase in pH. The kinetic experiments were carried out at different temperatures, and the results have shown that the sorption process fits well into a pseudo-second-order mechanism with apparent activation energy of 45.7 kJ/mol. The rate constant was found to decrease with increase in temperature. The thermodynamic parameters such as ∆G 0, ∆H 0 and ∆S 0 were calculated. The negative value of ∆H 0 indicates that the reaction is exothermic. The negative values obtained for ∆G 0 indicated that the sorption of cesium on clay was spontaneous at all studied concentrations. The distribution coefficient was found to decrease with increasing concentration of Na+ and Ca2+ ions. The cesium sorption data were fitted to Freundlich, Langmuir, Temkin and Dubinin–Radushkevich (D–R) isotherms. The values of Langmuir separation factor (R L) indicate a favorable Cs adsorption. The values of mean free energy of sorption (E) at various temperatures ranged from 10.5 to 11.1 kJ/mol, which indicates that the sorption process follows chemisorption.
Starting Page	281
Ending Page	296
Page Count	16
File Format	PDF
ISSN	13806165
Journal	Aquatic Geochemistry
Volume Number	18
Issue Number	4
e-ISSN	15731421
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-03-29
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cesium Sorption Exothermic Clay colloids Kinetics Hydrogeology Geochemistry
Content Type	Text
Resource Type	Article
Subject	Geophysics Geochemistry and Petrology

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