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Coordination of aluminum in saponite-like material as a function of synthesis pH

Published online by Cambridge University Press:  28 February 2025

Liva Dzene*
Affiliation:
Institut de Science des Matériaux de Mulhouse, CNRS UMR 7361, Université de Haute-Alsace, Université de Strasbourg, 68093 Mulhouse, France
Patrick Dutournié
Affiliation:
Institut de Science des Matériaux de Mulhouse, CNRS UMR 7361, Université de Haute-Alsace, Université de Strasbourg, 68093 Mulhouse, France
Séverinne Rigolet
Affiliation:
Institut de Science des Matériaux de Mulhouse, CNRS UMR 7361, Université de Haute-Alsace, Université de Strasbourg, 68093 Mulhouse, France
Loïc Vidal
Affiliation:
Institut de Science des Matériaux de Mulhouse, CNRS UMR 7361, Université de Haute-Alsace, Université de Strasbourg, 68093 Mulhouse, France
Benedikt Lassalle-Kaiser
Affiliation:
Synchrotron SOLEIL, l’Orme des Merisiers, Départementale 128, 91190 Saint Aubin, France
Delphine Vantelon
Affiliation:
Synchrotron SOLEIL, l’Orme des Merisiers, Départementale 128, 91190 Saint Aubin, France
Erwan Paineau
Affiliation:
Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, Orsay 91405, France
*
Corresponding author: Liva Dzene; Email: [email protected]

Abstract

Saponite-like materials have a wide range of potential applications, especially in heterogeneous catalysis. Despite the simplicity of the synthesis, the mechanisms of the formation of saponite are not well understood yet. The aim of the present study was to investigate a possible correlation between the coordination of Al in the solid phase and in the solution. For this, samples were prepared by varying the initial OH:Si molar ratio from 0.18 to 2.14, leading to a pH in the supernatant after the hydrothermal treatment of 6.7 to 12.7, respectively. The characterization of the material was performed by combining nuclear magnetic resonance (NMR) and X-ray absorption near edge structure (XANES) spectroscopies, and good agreement was obtained between the two techniques. Between pH7 and pH10, 60–65% of aluminum was found to be in tetrahedral coordination, while this percentage increased above pH10 (up to 81%). These results correlated with the speciation of the aluminum in aqueous solution. Indeed, above pH10, all available aluminum was in the soluble form Al(OH)4.

Type
Original Paper
Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of The Clay Minerals Society

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