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Adsorption Kinetics of Pentachloroethane by Iron-Bearing Smectites

Published online by Cambridge University Press:  28 February 2024

Javiera Cervini-Silva ,
Jun Wu ,
Joseph W. Stucki  and
Richard A. Larson
Javiera Cervini-Silva
Affiliation:
Department of Natural Resources and Environmental Sciences, University of Illinois, Urbana, Illinois 61801 USA
Jun Wu
Affiliation:
Department of Natural Resources and Environmental Sciences, University of Illinois, Urbana, Illinois 61801 USA
Joseph W. Stucki
Affiliation:
Department of Natural Resources and Environmental Sciences, University of Illinois, Urbana, Illinois 61801 USA
Richard A. Larson
Affiliation:
Department of Natural Resources and Environmental Sciences, University of Illinois, Urbana, Illinois 61801 USA
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Abstract

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The oxidation state of structural Fe greatly alters surface chemistry, which may have a large influence on clay-organic interactions. The effect of structural-iron oxidation state on chlorinated hydrocarbons at the clay-water interface was examined. Pentachloroethane (5CA) was reacted with oxidized, reduced, and reoxidized forms of three different smectites: montmorillonite, ferruginous smectite, and nontronite in aqueous suspension under controlled-atmosphere conditions. Pentachloroethane was found to adsorb at different rates for the three smectites. A series of 5CA-adsorption rate constants in the presence of these clays showed a strong correlation with the Fe(II) content of the clay (r2 = 0.98). The clay surface behaves as a Brønsted base and promotes 5CA dehydrochlorination. The adsorption kinetics at the clay-water interface were described by the formation of a precursor complex prior to 5CA dehydrochlorination.

Keywords

CMS Clay SWa-1CMS Clay NG-1DehydrochlorinationIron(II)Iron(III)MontmorilloniteNontroniteOxidationPentachloroethaneReduction ReactionsTetrachloroethene
Type
Research Article
Information
Clays and Clay Minerals , Volume 48 , Issue 1 , February 2000 , pp. 132 - 138
Copyright
Copyright © 2000, The Clay Minerals Society

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