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Acid-base chemistry of montmorillonitic and beidellitic-montmorillonitic smectite

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Abstract

Suspension of a Tunisian purified smectite and American montmorillonite are studied by acid-base potentiometric and mass titrations. These experimental methods are used to determine the point of zero net proton charge (PZNPC). A very good agreement is observed between the two kinds of experiments. The two Namontmorillonites, studied at different ionic strengths, present proton adsorption vs. pH curves with a common crossing point. The PZNPC of the edge sites are 8.02 for Tunisian purified smectite and 8.11 for pure American montmorillonite. By analyzing the proton adsorption or desorption (H+ vs. pH) curves, one may assume the presence of four active sites at the surface. The montmorillonite surface undergoes two successive protonations and two successive deprotonations. Below pH < PZNPC and in acidic range, the cation exchange at layer sites and protonation of edge sites (>A1OH groups) occur simultaneously. For pH > PZNPC and in alkaline pH range, deprotonation of surface hydroxyl groups exposed at the edge sites (>SiOH, and >A1OH at high pH) of montmorillonite platelets causes an overall negative charge.

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Authors and Affiliations

  1. Ecole Supérieure des Sciences et Techniques de Tunis, Rue Taha Hussein-Montrleury Tunis, Tunisia

    A. Kriaa

  2. Institut National de recherche scientifique et technique, Tunis, BP 95-2050, Hammam lif, Tunisia

    A. Kriaa, N. Hamdi & E. Srasra

Authors
  1. A. Kriaa
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  2. N. Hamdi
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  3. E. Srasra
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Correspondence to A. Kriaa.

Additional information

Published in Russian in Elektrokhimiya, 2007, Vol. 43, No. 2, pp. 175–187.

The text was submitted by the authors in English.

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Kriaa, A., Hamdi, N. & Srasra, E. Acid-base chemistry of montmorillonitic and beidellitic-montmorillonitic smectite. Russ J Electrochem 43, 167–177 (2007). https://doi.org/10.1134/S102319350702005X

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  • DOI: https://doi.org/10.1134/S102319350702005X

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