Sorption of cesium on montmorillonite and effects of salt concentration

被引:24
作者
Atun, G
Bilgin, B
Mardinli, A
机构
[1] Department of Chemistry, Faculty of Engineering, University of Istanbul AVCILAR
来源
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES | 1996年 / 211卷 / 02期
关键词
D O I
10.1007/BF02039709
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The sorption behavior of cesium on montmorillonite type clay was studied by using radioactivity measurements. Concentrations of Cs+ ions ranged from 10(-6) to 10(-2) M. Cesium retention reduced with increasing salt concentration which was varied between 10(-4) and 10(-1) M. Selectivity coefficients KCs-Na for the exchange between Cs and Na were calculated for different equivalent fractions of Cs on the solid phase. Using the KCs-Na values, free energy change was found to be 7.8 kJ/mol. The data could be fitted to a Freundlich isotherm, and empirical Freundlich parameters enabled the generation of a site distribution function. By fitting the data to the Dubinin-Radushkevich (D-R) isotherm, a mean energy of sorption of 8.6 kJ/mole was calculated which corresponds to the energy of ion exchange reactions. The values of energy changes calculated by using two different methods were in good agreement.
引用
收藏
页码:435 / 442
页数:8
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