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Adsorption of humic acid onto a kaolinitic clay studied by high-resolution argon adsorption volumetry

Published online by Cambridge University Press:  09 July 2018

A. Saada ,
H. Gaboriau ,
S. Cornu ,
F. Bardot ,
F. Villiéras  and
J . P. Croué
A. Saada*
Affiliation:
Bureau de Recherches Géologiques et Minières (BRGM), Environnement Procédés, 3, avenue Claude Guillemin, BP 6009, 45060 Orléans Cedex 2
H. Gaboriau
Affiliation:
Bureau de Recherches Géologiques et Minières (BRGM), Environnement Procédés, 3, avenue Claude Guillemin, BP 6009, 45060 Orléans Cedex 2
S. Cornu
Affiliation:
Unité de Science du sol, INRA d'Orléans, Avenue de la pomme de pin, BP 20619, 45166 Olivet Cedex
F. Bardot
Affiliation:
Bureau de Recherches Géologiques et Minières (BRGM), Environnement Procédés, 3, avenue Claude Guillemin, BP 6009, 45060 Orléans Cedex 2
F. Villiéras
Affiliation:
Laboratoire Environnement etMinéralurgie, UMR 7569 INPL & CNRS, ENSG - BP 40 - 54501 Vandoeuvre-les-Nancy Cedex
J . P. Croué
Affiliation:
Laboratoire de Chimie de l'Eau et de l'Environnement, 40, Avenue du Recteur Pineau, 86022 Poitiers Cedex, France
*
*E-mail: [email protected]
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Abstract

The mechanisms governing the adsorption of a commercial humic acid (HA) on a kaolinitic clay were determined. The amount of HA fixed increased with the ionic strength of the medium and the presence of divalent ions (Ca2+). The effect of Ca2+ is due to its ability to establish (1) intramolecular bridges causing condensation of the HA, and (2) intermolecular bridges between the clay and the HA. A stable clay-humic complex containing only the fraction of HA that withstands washing with water was prepared and characterized by high-resolution Ar adsorption volumetry. The overall results show that (1) HA interacts strongly with the basal surfaces of the clay, (2) Ca serves to establish Ca2+ bridges between HA and clay, and (3) HA and clay interact via at least two distinct adsorption mechanisms.

Keywords

kaolinitenatural organic mattersorptioncalcium
Type
Research Article
Information
Clay Minerals , Volume 38 , Issue 4 , December 2003 , pp. 433 - 443
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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