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Cation and Anion Sorption Capability of Organophilic Bentonite

Published online by Cambridge University Press:  10 February 2011

J. Bors ,
St. Dultz  and
B. Riebe
J. Bors
Affiliation:
Center of Radiation Protection and Radioecology, University Hannover, Herrenhäuser Str. 2, D-30419 Hannover
St. Dultz
Affiliation:
Institute of Soil Science, University Hannover, Herrenhäuser Str. 2, D-30419 Hannover
B. Riebe
Affiliation:
Center of Radiation Protection and Radioecology, University Hannover, Herrenhäuser Str. 2, D-30419 Hannover
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Abstract

Sorption experiments were performed with iodide, cesium and strontium ions on MX-80 Wyoming-bentonite treated with hexadecylpyridinium (HDPy+) in amounts equivalent to 0.2 - 4.0 times the cation exchange capacity (CEC) using 125I- 134Cs+ and 85Sr2+ as tracers. In HDPy-bentonite, iodide exhibited increasing adsorption, while cesium and strontium ions showed decreasing adsorption with increasing organophilicity. It was also found that the Cs+affinity to original and HDPy-bentonite was considerably higher than that of Sr2+ ions. HDPy+ uptake in increasing concentrations resulted in a pronounced expansion of the basal spacings (d002 reflex at 2.78 nm) and in a change of the negative particle surface charge to positive values.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 506: Symposium – Scientific Basis for Nuclear Waste Management XXI , 1997 , 297
Copyright
Copyright © Materials Research Society 1998

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