Effect of Illite Particle Shape on Cesium Sorption

Pavol Rajec1, Vladimír Šucha2, Dennis D. Eberl3, Jan Środoń4 and Françoise Elsass5
1 Department of Nuclear Chemistry, Comenius University, Mlynská dolina, 842 15 Bratislava, Slovakia
2 Department of Geology of Mineral Deposits, Comenius University, Mlynská dolina, 842 15 Bratislava, Slovakia
3 U.S. Geological Survey, 3215 Marine Street, Boulder, Colorado 80303, USA
4 Institute of Geology, Polish Academy of Sciences, Senacka 1, Krakow, Poland
5 INRA, Station de Science du Sol, Route de St. Cyr, 78026 Versailles, France
E-mail of corresponding author: sucha@fns.uniba.sk

Abstract: Samples containing illite and illite-smectite, having different crystal shapes (plates, “barrels”, and filaments), were selected for sorption experiments with cesium. There is a positive correlation between total surface area and Cs-sorption capacity, but no correlation between total surface area and the distribution coefficient, Kd. Generally Kd increases with the edge surface area, although “hairy” (filamentous) illite does not fit this pattern, possibly because elongation of crystals along one axis reduces the number of specific sorption sites.

Key Words: Cesium Sorption • Distribution Coefficient • Illite • Particle Shape

Clays and Clay Minerals; December 1999 v. 47; no. 6; p. 755-760; DOI: 10.1346/CCMN.1999.0470610
© 1999, The Clay Minerals Society
Clay Minerals Society (www.clays.org)