Cation and anion sorption capability of organophilic bentonite

authored by

J. Bors, St Dultz, B. Riebe

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.

Organisation(s)

Institute of Soil Science
Section Soil Chemistry
Centre for Radiation Protection and Radioecology

Type

Conference article

Journal

Materials Research Society Symposium - Proceedings

Volume

506

Pages

[d]297-304

ISSN

0272-9172

Publication date

1997

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

General Materials Science, Condensed Matter Physics, Mechanics of Materials, Mechanical Engineering

Electronic version(s)

https://doi.org/10.1557/proc-506-297 (Access: Unknown)