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Chemically modified smectites

Published online by Cambridge University Press:  09 July 2018

P. Komadel
P. Komadel*
Affiliation:
Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-845 36 Bratislava Slovakia
*
*E-mail: uachkomp@savba.sk
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Abstract

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This paper summarizes recent results obtained on chemical modifications of smectites. These include replacement of exchangeable cations with protons, a process connected with smectite autotransformation – attack of protons on the layers and liberation of central atoms from the octahedral and tetrahedral sheets, causing modification of the acid sites on the particles. More severe modifications occur during dissolution in inorganic acids, when the layers are dissolved and threedimensional amorphous silica is formed. The negative charge on the smectite layers can be increased via reduction of structural Fe(III) to Fe(II) or decreased via fixation of small exchangeable cations, such as Li+, upon treatment at elevated temperatures. Heating for 24 h at different temperatures between 100 and 300ºC leads to a series of chemically similar materials of different charge, prepared from the same parent mineral. Such series are suitable for investigation of the effect of the layer charge on selected properties of smectites. Fe(II) can be partly stabilized in reduced smectites by Li fixation upon heating.

Keywords

H-smectitesacid dissolutioncharge modificationLi fixationreduction

Information

Type
Research Article
Information
Clay Minerals , Volume 38 , Issue 1 , March 2003 , pp. 127 - 138
Creative Commons
Creative Common License - CCCreative Common License - BY
Copyright © The Mineralogical Society of Great Britain and Ireland 2003 This is an Open Access article, distributed under the terms of the Creative Commons Attribution license. (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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