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Influence of montmorillonite on Fe(II) oxidation products

Published online by Cambridge University Press:  09 July 2018

G. S. R. Krishnamurti ,
A. Violante  and
P. M. Huang
G. S. R. Krishnamurti
Affiliation:
Department of Soil Science, University of Saskatchewan, 51 Campus Drive, Saskatoon SK S7N 5A8, Canada
A. Violante
Affiliation:
Dipartimento di Scienze Chimico-Agrarie, Universita di Napoli Federico II, 80055 Portici, Italy
P. M. Huang
Affiliation:
Department of Soil Science, University of Saskatchewan, 51 Campus Drive, Saskatoon SK S7N 5A8, Canada
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Abstract

Goethite and maghemite are the stable species of Fe oxyhydroxides-oxides formed an acidic and alkaline environments from the oxidation of Fe(II) perchlorate solutions. The influence of montmorillonite on the oxidation products of 0.02 M ferrous perchlorate at pHs of 6.0 and 8.0 was studied by X-ray diffraction, infrared and transmission electron microscopic analyses. Increased rate of OH consumption during the oxidation at constant pH indicated that the presence of montmorillonite accelerated the rate of Fe(II) oxidation. The presence of montmorillonite, with high surface reactivity, at an initial montmorillonite/Fe (w/w) ratios of 1.4 and 3.4 retarded the formation of goethite, lepidocrocite and maghemite, and maghemite and goethite, and promoted the formation of ferrihydrite and lepidocrocite at pHs of 6.0 and 8.0, respectively. Kaolinite, on the other hand, with relatively low surface reactivity had no influence on the nature of the Fe(II) oxidation products formed at either pH.

Type
Research Article
Information
Clay Minerals , Volume 33 , Issue 2 , June 1998 , pp. 205 - 212
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1998

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