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Chromate Adsorption by Kaolinite

Published online by Cambridge University Press:  02 April 2024

J. M. Zachara ,
C. E. Cowan ,
R. L. Schmidt  and
C. C. Ainsworth
J. M. Zachara
Affiliation:
Batteile, Pacific Northwest Laboratories, P.O. Box 999, Richland, Washington 99352
C. E. Cowan
Affiliation:
Batteile, Pacific Northwest Laboratories, P.O. Box 999, Richland, Washington 99352
R. L. Schmidt
Affiliation:
Batteile, Pacific Northwest Laboratories, P.O. Box 999, Richland, Washington 99352
C. C. Ainsworth
Affiliation:
Batteile, Pacific Northwest Laboratories, P.O. Box 999, Richland, Washington 99352
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Abstract

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Chromate (CrO42−) adsorption was investigated on kaolinite (0.2–2 μm) saturated with NaClO4 over a range of pH. Adsorption increased with decreasing pH because of protonation of chromate and/or variable charge sites on kaolinite. Chemical pretreatment to remove noncrystalline and crystalline oxide contaminants affected the magnitude of CrO42− adsorption, but not the pH range over which CrO42− adsorbed. Chromate adsorption at different sorbate and sorbent concentrations increased below the pHzpc for the kaolinite edge, suggesting the formation of weak surface complexes. If CrO42− and SO42− were present at equal concentration (5.0 × 10−7 M), the two solutes sorbed independently, suggesting binding to separate sites. The presence of excess SO42− (5.0 × 10−4 M), however, unexplainably enhanced CrO42− adsorption. The adsorption of both Chromate and sulfate can be described in terms of a site-binding model of the kaolinite edge, in which the edge is viewed as composite layers of Al and Si oxide. Surface complexation constants for CrO42− on kaolinite were similar to those for alumina, pointing to the importance of Al-OH edge sites in Chromate adsorption.

Keywords

AdsorptionChromateKaoliniteSulfateSurface complex
Type
Research Article
Information
Clays and Clay Minerals , Volume 36 , Issue 4 , August 1988 , pp. 317 - 326
Copyright
Copyright © 1988, The Clay Minerals Society

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