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Effects of Iron Oxidation State on the Specific Surface Area of Nontronite

Published online by Cambridge University Press:  02 April 2024

Paul R. Lear  and
Joseph W. Stucki
Paul R. Lear*
Affiliation:
Department of Agronomy, University of Illinois, Urbana, Illinois 61801
Joseph W. Stucki
Affiliation:
Department of Agronomy, University of Illinois, Urbana, Illinois 61801
*
1Current address: EPL Bio-Analytical Services, Inc., Decatur, Illinois 62525
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Abstract

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The effect of Fe oxidation state on the specific surface area, Sm, of nontronite was studied using the <2-µm, Na+-saturated fraction of the SWa-1 and Garfield nontronite reference clays. The reduction of structural Fe3+ in the octahedral sheet of the nontronite decreased Sm as measured by the adsorption of 2-ethoxyethanol (ethylene glycol-monoethyl ether, EGME). The swellability in water of the nontronite also decreased during reduction. The amount of nonexchangeable Na+, on the other hand, increased with increasing Fe2+ content and was highly correlated with EGME adsorption (r = -.985). The relationship between Sm and Fe2+ was attributed to the collapse of partially or fully expanded layers to unexpanded layers.

Keywords

Ethylene glycol-monoethyl etherIronNontroniteOxidationSpecific surface area
Type
Research Article
Information
Clays and Clay Minerals , Volume 37 , Issue 6 , December 1989 , pp. 547 - 552
Copyright
Copyright © 1989, The Clay Minerals Society

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