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Iodide, caesium and strontium adsorption by organophilic vermiculite

Published online by Cambridge University Press:  09 July 2018

J. Bors ,
A. Gorny  and
S. Dultz
J. Bors
Affiliation:
Centre of Radiation Protection and Radioecology, Hannover University, Herrenhäuser Str. 2, D-30419 Hannover, Germany
A. Gorny
Affiliation:
Dahlemer Str. 4, D-30982 Pattensen, Germany
S. Dultz
Affiliation:
Institute of Soil Science, Hannover University, Herrenhäuser Str. 2, D-30419 Hannover, Germany
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Abstract

Distribution coefficients and isotherms for the adsorption of radioiodide, caesium and strontium ions (125I−, 134Cs+ and 85Sr2+) were determined in untreated vermiculite and in vermiculite treated with the chloride salt of hexadecylpyridinium (HDPy+). Experimental data reveal that some of the alkylammonium ions were incorporated as HDPyCl ion pairs into the vermiculite. The fraction of ion pairs adsorbed is reflected by an increase in distribution coefficients with increasing saturation levels. Consequently, a considerable part of the iodide adsorption could be attributed to an anion exchange process. At smaller amounts of Cs+ and Sr2+ adsorbed, distribution coefficients of the modified clay mineral are significantly reduced in comparison with the original material. These differences are less pronounced when greater amounts of cations are adsorbed. Generally, larger distribution coefficients were found for the Cs+ compared with the Sr2+ ion in the untreated and modified samples.

Type
Research Article
Information
Clay Minerals , Volume 32 , Issue 1 , March 1997 , pp. 21 - 28
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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