Iodide, caesium and strontium adsorption by organophilic vermiculite

authored by

J. Bors, A. Gorny, S. Dultz

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 pan 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.

Organisation(s)

Institute of Soil Science
Section Soil Chemistry

Type

Article

Journal

Clay minerals

Volume

32

Pages

21-28

No. of pages

8

ISSN

0009-8558

Publication date

1997

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Geochemistry and Petrology

Electronic version(s)

https://doi.org/10.1180/claymin.1997.032.1.04 (Access: Unknown)