Thermodynamic parameters of Cs+ sorption on natural clays

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Thermodynamic parameters of Cs+ sorption on natural clays.pdf (70.42 KB)

Date

2002

Authors

Shahwan, T.
Erten, H. N.

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Source Title

Journal of Radioanalytical and Nuclear Chemistry

Print ISSN

0236-5731

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Publisher

Akademiai Kiado Rt.

Volume

253

Issue

1

Pages

115 - 120

Language

English

Type

Article

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Abstract

The sorption behavior of Cs+ on kaolinite, chlorite-illite, and bentonite clays as a function of time, cation concentration, and temperature was studied using the radiotracer method. Sorption data were well represented by Freundlich and Dubinin-Radushkevich type isotherms. Bentonite was found to have the highest sorption capacity and the highest exchange affinity to Cs+. In all three cases Cs+ sorption was found to be exothermic with ΔH° (kJ/mol) -13, -8, -19 and ΔS° (J/mol·K) -15, 31, and -3 for kaolinite, chlorite-illite, and bentonite, respectively. Negative ΔG° values were obtained in all cases, indicating the spontaneity of sorption. The magnitudes of ΔG° suggest that ion exchange is the primary sorption mechanism.

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Keywords

Aluminum silicate, Bentonite, Cesium ion, Sodium chlorite, Tracer, Clay, Concentration (parameters), Ion exchange, Methodology, Radiation absorption, Temperature dependence, Thermal analysis, Thermodynamics

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http://hdl.handle.net/11693/24663

Published Version (Please cite this version)

http://dx.doi.org/10.1023/A:1015824819940

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Scholarly Publications - Chemistry