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A view of reactions at mineral surfaces from the aqueous phase

Published online by Cambridge University Press:  05 July 2018

W. H. Casey
W. H. Casey*
Affiliation:
Department of Land, Air and Water Resources, Department of Geology, University of California, Davis, CA 95616, USA
*
*E-mail: [email protected]
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Abstract

The processes by which a metal–oxygen bond dissociates in aqueous complexes are discussed and the reactions related to more complicated pathways of mineral dissolution. The dissolution of oxide minerals, and in fact many other classes of surface reactions, can be viewed as a ligand-exchange reaction because the bridging oxygens that link the metal to the mineral are progressively replaced by non-bridging functional groups. These ligand-exchange reactions are accelerated by protonations, hydroxylations and ligand substitutions that modify the lability of surface oxygens, but always at specific sites. Molecular information is important because reactions at some sites retard rates while reaction at other sites enhance them. Virtually all of the important variables that affect these reaction rates are local.

Keywords

dissolutionligand-exchangeoxide mineralsmineral surfaces
Type
Research Article
Information
Mineralogical Magazine , Volume 65 , Issue 3 , June 2001 , pp. 323 - 337
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2001

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