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Destabilization of montmorillonite suspensions by Ca2+ and succinoglycan

Published online by Cambridge University Press:  09 July 2018

J . Labille ,
F. Thomas ,
I . Bihannic  and
C. Santaella
J . Labille*
Affiliation:
Laboratoire Environnement et Minéralurgie - UMR 7569 CNRS-INPL, BP 40, 54501 Vandoeuvre-lès-Nancy cedex, France
F. Thomas
Affiliation:
Laboratoire Environnement et Minéralurgie - UMR 7569 CNRS-INPL, BP 40, 54501 Vandoeuvre-lès-Nancy cedex, France
I . Bihannic
Affiliation:
Laboratoire Environnement et Minéralurgie - UMR 7569 CNRS-INPL, BP 40, 54501 Vandoeuvre-lès-Nancy cedex, France
C. Santaella
Affiliation:
CEA Cadarache DSV DEVM, Laboratoired'Ecologie Microbienne de laRhizosphère -UMR 163 CNRSCEA, Université Méditerranée, 13108, Saint-Paul-lez-Durance cedex, France
*
*E-mail: [email protected]
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Abstract

Aggregation of colloidal clay particles (Na-montmorillonite) by CaCl2 and anionic polysaccharide (succinoglycan) in turbulent conditions was investigated using time-resolved size measurements by laser diffraction on diluted (50 mg l –1) and stirred suspensions. Excess of Ca2+ ions promotes coagulation of the clay, reducing interparticle repulsions, and allows adsorption of succinoglycan, inducing bridging flocculation. Growth/breakage cycles, characteristic of the turbulent conditions, cause the macromolecules to be incorporated in the innermost of the flocs, where the morphological units are shown by confocal microscopy to be the micrometric Ca-clay particles. Such incorporation results in an increased floc tensile strength, depending on the amount of macromolecules adsorbed, with a maximum at polysaccharide concentrations of 2 wt.% with respect to clay mass.

Keywords

montmorillonitepolysaccharideflocculationlaser diffractionconfocal microscopysoil aggregation.
Type
Research Article
Information
Clay Minerals , Volume 38 , Issue 2 , June 2003 , pp. 173 - 185
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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