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The transformation of synthetic hectorite in the presence of Cu(II)

Published online by Cambridge University Press:  01 January 2024

Håkon Fischer ,
Peter G. Weidler ,
Bernard Grobéty ,
Jörg Luster  and
Andreas U. Gehring
Håkon Fischer*
Affiliation:
Institute of Geophysics, ETH Zurich, 8092 Zurich, Switzerland
Peter G. Weidler
Affiliation:
Forschungszentrum Karlsruhe, Institute for Technical Chemistry, Water- and Geotechnology, 76021 Karlsruhe, Germany
Bernard Grobéty
Affiliation:
Institut de Minéralogie, Université de Fribourg, 1700 Fribourg, Switzerland
Jörg Luster
Affiliation:
Swiss Federal Institute for Forest, Snow, and Landscape Research WSL, CH-8903 Birmensdorf, Switzerland
Andreas U. Gehring
Affiliation:
Institute of Geophysics, ETH Zurich, 8092 Zurich, Switzerland
*
* E-mail address of corresponding author: [email protected]
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Abstract

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The influence of Cu(II) on the hydrothermal and thermal transformations of a synthetic hectorite was investigated by a combined approach using mainly X-ray diffraction, thermal analyses, and electron paramagnetic resonance spectroscopy. The presence of Cu(II) during hydrothermal treatment increased the crystallite size. Copper (II) was both structure-bound and associated with the inner surfaces of the particles. Upon heating, structural destabilization of the hectorite began at ∼400°C as indicated by the formation of free radicals. Between 600 and 700°C, the hectorite converted to enstatite, and in the presence of Cu(II), to enstatite and richterite. The formation of richterite as an additional conversion product is explained by the creation of structural weakness due to structure-bound Cu(II) in F-containing hectorite. Our results suggest that traces of Cu(II), typical of natural environments, may influence the conversion products in high-temperature geochemical systems.

Keywords

Cu(II)DSCEPRHectoriteHydrothermal TreatmentTGXRD
Type
Article
Information
Clays and Clay Minerals , Volume 57 , Issue 2 , April 2009 , pp. 139 - 149
Copyright
Copyright © The Clay Minerals Society 2009

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