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Effect of Silicate Species on the Transformation of Ferrihydrite into Goethite and Hematite in Alkaline Media

Published online by Cambridge University Press:  02 April 2024

R. M. Cornell ,
R. Giovanoli  and
P. W. Schindler
R. M. Cornell
Affiliation:
Institute of Inorganic Chemistry, University of Berne, Freiestrasse 3, CH-3000 Berne 9, Switzerland
R. Giovanoli
Affiliation:
Laboratory of Electron Microscopy, University of Berne, Freiestrasse 3, CH-3000 Berne 9, Switzerland
P. W. Schindler
Affiliation:
Institute of Inorganic Chemistry, University of Berne, Freiestrasse 3, CH-3000 Berne 9, Switzerland
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Abstract

The transformation of ferrihydrite to goethite and/or hematite in alkaline media is strongly retarded by the presence of silicate species. These species probably stabilize ferrihydrite by adsorbing on the particles of ferrihydrite and linking them into an immobile network.

At concentrations low enough for the transformation to proceed, silicate species promote the formation of hematite and hinder the nucleation of goethite. The presence of silicate species modifies the morphology of both reaction products. Hematite forms ellipsoidal single crystals, commonly displaying outgrowths of goethite. Silicate species in solution appear to enhance the development of the (021) faces of goethite, probably by preferential adsorption on these faces; at high levels of silicate species, goethite crystals adopt a pseudohexagonal habit. This morphology has not been observed previously for goethite.

Keywords

FerrihydriteGoethiteHematiteMorphologySilicateTransmission electron microscopy
Type
Research Article
Information
Clays and Clay Minerals , Volume 35 , Issue 1 , February 1987 , pp. 21 - 28
Copyright
Copyright © 1987, The Clay Minerals Society

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