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

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.
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https://hal.inrae.fr/hal-02681599
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Submitted on : Sunday, May 31, 2020 - 11:37:12 PM
Last modification on : Wednesday, April 20, 2022 - 3:39:31 AM

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Alain Saada, Hervé Gaboriau, Sophie S. Cornu, Frédérique Bardot, F. Villiéras, et al.. Adsorption of humic acid onto a kaolinitic clay studied by high-resolution argon adsorption volumetry. Clay Minerals, Mineralogical Society, 2003, 38 (4), pp.433-443. ⟨10.1180/0009855033840107⟩. ⟨hal-02681599⟩

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