Formation of Highly Selective Cesium-Exchange Sites in Montmorillonites

André Maes, Dirk Verheyden and Adrien Cremers
Afdeling Interfasechemie, Katholieke Universiteit Leuven Kardinaal Mercierlaan 92, B-3030 Leuven, Belgium

Abstract: Ion-exchange sites with very high selectivity for Cs ( ΔG Ca 2+ Cs + = 40 kJ/eq) similar to illite were generated in a controlled way in montmorillonites by (1) repeated wetting-drying cycles and by (2) charge reduction using the Hofmann-Klemen effect. An almost continuous range of sites with selectivities varying from in K Ca 2+ Cs + = 33 to 5 was observed.

Key Words: Cation exchange • Cation selectivity • Cesium • Hofmann-Klemen effect • Montmorillonite • Wetting-drying

Clays and Clay Minerals; June 1985 v. 33; no. 3; p. 251-257; DOI: 10.1346/CCMN.1985.0330312
© 1985, The Clay Minerals Society
Clay Minerals Society (www.clays.org)