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Transformation of Synthetic Zn-Stevensite to Zn-Talc Induced by the Hofmann-Klemen Effect

Published online by Cambridge University Press:  01 January 2024

S. Petit ,
D. Righi  and
A. Decarreau
S. Petit*
Affiliation:
Université de Poitiers, FRE3114 CNRS, HydrASA, 40 Avenue du Recteur Pineau, F-86022 POITIERS Cedex, France
D. Righi
Affiliation:
Université de Poitiers, FRE3114 CNRS, HydrASA, 40 Avenue du Recteur Pineau, F-86022 POITIERS Cedex, France
A. Decarreau
Affiliation:
Université de Poitiers, FRE3114 CNRS, HydrASA, 40 Avenue du Recteur Pineau, F-86022 POITIERS Cedex, France
*
* E-mail address of corresponding author: [email protected]
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Abstract

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Stevensite-like sauconite, with the general composition: Si4(Zn3−x□x)O10(OH)2R2x+\$\end{document}, where □ is a vacant site, was synthesized. The objective was to study the possible migration of some cations (Li+ and Zn2+) within such trioctahedral smectites, under heating, following the so-called ‘Hofmann-Klemen’ (HK) effect. The initial gel was divided into five aliquots and placed in teflon-coated hydrothermal reactors with distilled water, and these were hydrothermally treated at 80, 100, 120, 150, and 200°C, respectively, over 30 days. X-ray diffraction (XRD) analysis confirmed that the samples synthesized were smectites. The number of vacant sites (x) per half unit cell (O10(OH)2) ranged from nearly 0 to 0.23 but no simple relationship was established between x and the temperature of synthesis. The samples were Li+- and Zn2+-saturated, and heated overnight at 300°C (HK treatment). Cation exchange capacity measurements were made by Fourier transform infrared spectroscopy (FTIR) on NH4+\$\end{document}-saturated samples. After LiHK treatment, the structural formula of samples could be expressed as: Si4Zn(3−x)LixO10(OH)2NH4x+\$\end{document}, while after ZnHK treatment, it could be expressed as: Si4Zn3O10(OH)2. Analysis by XRD and FTIR showed that the samples moved from a Zn-stevensite-like structure to Zn-talc-like structure after treatment with ZnHK. These results are interpreted asevidence that Zn2+ (and Li+) migrated into the previously vacant sites under HK treatment.

Keywords

Cation Exchange CapacityHofmann-KlemenKeroliteLi+NH+4Octahedral ChargeSauconiteSmectiteStevensiteSynthesisZinc
Type
Article
Information
Clays and Clay Minerals , Volume 56 , Issue 6 , December 2008 , pp. 645 - 654
Copyright
Copyright © 2008, The Clay Minerals Society

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