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

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Clays and Clay Minerals

Abstract

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.

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Authors and Affiliations

  1. Institute of Geophysics, ETH Zurich, 8092, Zurich, Switzerland

    Håkon Fischer & Andreas U. Gehring

  2. Forschungszentrum Karlsruhe, Institute for Technical Chemistry, Water- and Geotechnology, 76021, Karlsruhe, Germany

    Peter G. Weidler

  3. Institut de Minéralogie, Université de Fribourg, 1700, Fribourg, Switzerland

    Bernard Grobéty

  4. Swiss Federal Institute for Forest, Snow, and Landscape Research WSL, CH-8903, Birmensdorf, Switzerland

    Jörg Luster

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  1. Håkon Fischer
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  2. Peter G. Weidler
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  3. Bernard Grobéty
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  4. Jörg Luster
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  5. Andreas U. Gehring
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Correspondence to Håkon Fischer.

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Fischer, H., Weidler, P.G., Grobéty, B. et al. The transformation of synthetic hectorite in the presence of Cu(II). Clays Clay Miner. 57, 139–149 (2009). https://doi.org/10.1346/CCMN.2009.0570201

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  • DOI: https://doi.org/10.1346/CCMN.2009.0570201

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