Sorption of cesium on montmorillonite and effects of salt concentration


KİLİSLİOĞLU A.

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, vol.211, no.2, pp.435-442, 1996 (Journal Indexed in SCI Expanded)

  • Publication Type: Article / Article
  • Volume: 211 Issue: 2
  • Publication Date: 1996
  • Title of Journal : JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
  • Page Numbers: pp.435-442

Abstract

The sorption behavior of cesium on montmorillonite type clay was studied by using radioactivity measurements. Concentrations of Cs+ ions ranged from 10−6 to 10−2M. Cesium retention reduced with increasing salt concentration which was varied between 10−4 and 10−1M. Selectivity coefficients KCs−Na for the exchange between Cs and Na were calculated for different equivalent fractions of Cs on the solid phase. Using theK Cs−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.