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Evolution of Hematite Surface Microtopography Upon Dissolution by Simple Organic Acids

Published online by Cambridge University Press:  28 February 2024

Patricia A. Maurice ,
Michael F. Hochella Jr. ,
George A. Parks ,
Garrison Sposito  and
Udo Schwertmann
Patricia A. Maurice
Affiliation:
Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305
Michael F. Hochella Jr.
Affiliation:
Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305
George A. Parks
Affiliation:
Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305
Garrison Sposito
Affiliation:
Department of Environmental Science, Policy, and Management, University of California at Berkeley, Berkeley, California 94720
Udo Schwertmann
Affiliation:
Institute of Soil Science, Technical University of Munich, Germany
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Abstract

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The surface microtopography of hematite over the course of dissolution in oxalic and citric acids was examined by in-situ and ex-situ atomic-force microscopy. In-situ imaging of the basal-plane surface of a centimeter-scale natural hematite sample immersed in 2 mM citric acid demonstrated that the basal-plane surface was relatively unreactive; rather, dissolution occurred along step edges and via etch-pit formation. Ex-situ imaging of synthetic hematite particles following batch dissolution in 1 mM oxalic acid showed similar dissolution features on basal-plane surfaces; in addition, etching along particle edges was apparent. The presence of etch features is consistent with a surface-controlled dissolution reaction. The results are in agreement with previous investigations suggesting that the basal-plane surface is relatively unreactive with respect to ligand exchange. Both in-situ and ex-situ imaging of particle surfaces can provide valuable information on the roles of surface structures and microtopographic features in mineral dissolution.

Keywords

Atomic force microscopeClay mineral surfacesDissolutionHematiteOrganic acids
Type
Research Article
Information
Clays and Clay Minerals , Volume 43 , Issue 1 , February 1995 , pp. 29 - 38
Copyright
Copyright © 1995, The Clay Minerals Society

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