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Features of the Hydrothermal Synthesis of Montmorillonite in an Acidic Medium

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Abstract

The process of the hydrothermal crystallization of montmorillonite Na2x(Al2(1 – x),Mg2x)-Si4O10(OH)2 · nH2O (0 < x ≤ 1) is studied in a weakly acidic medium with pH 4–4.5 at 220°С using HF as a mineralizer. The results of the study showed that montmorillonite samples in the acidic medium can be obtained both with the use of the HF mineralizer and without it. Under any conditions of carrying out the synthesis, there is an insignificant amount of corundum in the final product. It is established that a weakly acidic medium favors the formation of a dioctahedral structure of smectites with insignificant isomorphic substitutions (0.5 ≤ x ≤ 1). At a higher aluminum content, the acidic medium does not contribute to the formation of two-dimensional silicon-oxygen layers.

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ACKNOWLEDGMENTS

I am grateful to the employees of the analytical group of the Laboratory of Physical Chemistry of Glass, Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, T.G. Kostyreva, L.N. Kurilenko, and L.A. Doronina, for the chemical analysis of the samples.

This work was supported by the Russian Foundation for Basic Research (project no. 18-03-00156).

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  1. Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, 199034, St. Petersburg, Russia

    O. Yu. Golubeva

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  1. O. Yu. Golubeva
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Correspondence to O. Yu. Golubeva.

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Translated by L. Mosina

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Golubeva, O.Y. Features of the Hydrothermal Synthesis of Montmorillonite in an Acidic Medium. Glass Phys Chem 44, 616–619 (2018). https://doi.org/10.1134/S1087659618060081

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