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Effect of Clay Charge on Swelling: A Clay-Modified Electrode Study

Published online by Cambridge University Press:  28 February 2024

Alanah Fitch ,
Jia Du ,
Huamin Gan  and
J. W. Stucki
Alanah Fitch
Affiliation:
Department of Chemistry, Loyola University of Chicago, 6525 N. Sheridan Rd., Chicago, Illinois 60626
Jia Du
Affiliation:
Department of Chemistry, Loyola University of Chicago, 6525 N. Sheridan Rd., Chicago, Illinois 60626
Huamin Gan
Affiliation:
Department of Agronomy, University of Illinois, Champaign-Urbana, Urbana, Illinois 61801-4798
J. W. Stucki
Affiliation:
Department of Agronomy, University of Illinois, Champaign-Urbana, Urbana, Illinois 61801-4798
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Abstract

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The uniformity of clay films affects the transport of an anionic electroactive probe through the film. When cations other than Na+ are present in the initial swelling of the film (such as native K+ and Ca2+), or when the native clay is highly charged, internal dislocations of the film, caused by variable stacking domains, enhance the diffusive transport of Fe(CN)63− across the film. This effect is investigated using clay-modified electrodes in which the clays are of variable exchange forms (Na+, Ca2+, or K+) and variable charge. The charge on the clay is determined both by the native form of the clay and by reduction of structural Fe3+. The results suggest that swelling of clays increases in a linear fashion with CEC, at least for minimally charged clays.

Keywords

Charged claysDiffusive transportIron reduction
Type
Research Article
Information
Clays and Clay Minerals , Volume 43 , Issue 5 , October 1995 , pp. 607 - 614
Copyright
Copyright © 1995, The Clay Minerals Society

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