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Wettability of Montmorillonite Clays in Humic Acid Solutions

Published online by Cambridge University Press:  01 January 2024

Juan Dios García de López-Durán ,
Asmae Khaldoun ,
Mohamed Larbi Kerkeb ,
María del Mar Ramos-Tejada  and
Fernando González-Caballero
Juan Dios García de López-Durán
Affiliation:
Department of Applied Physics, Faculty of Sciences, University of Granada, 18071 Granada, Spain
Asmae Khaldoun
Affiliation:
Department of Physics, Faculty of Sciences, Abdelmalek Essaadi University, 93000 Tetouan, Morocco
Mohamed Larbi Kerkeb
Affiliation:
Department of Physics, Faculty of Sciences, Abdelmalek Essaadi University, 93000 Tetouan, Morocco
María del Mar Ramos-Tejada
Affiliation:
Department of Applied Physics, Faculty of Experimental Sciences, University of Jaén, 23071 Jaén, Spain
Fernando González-Caballero*
Affiliation:
Department of Applied Physics, Faculty of Sciences, University of Granada, 18071 Granada, Spain
*
*E-mail address of corresponding author: fgonzale@ugr.es
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Abstract

The effect of humic acid (HA) adsorption on the hydrophilicity of two different montmorillonite samples (Na-montmorillonite, NaMt, and a Na-fluorinated Na-montmorillonite, FNaMt, or ‘Rassoul’) was investigated. The changes in the wettability of clays were discussed in terms of the non-electrostatic free energy of interaction between the clay particles immersed in aqueous humic acid solutions (ΔG121), using the van Oss-Chaudhury-Good (vOCG) model. The surface free energy components (both non-polar or Lifshitz-van der Waals, and polar or acid-base) of clays were obtained from contact angle measurements, after adsorption of humic acid, at acid or basic pH, in 10−2 M NaCl solutions. It was found that: (1) at acid pH, a progressive decrease in the hydrophilic character of both clays was observed when the humic acid concentration was increased; (2) at basic pH, the hydrophilic character of both samples studied increased with HA concentration; (3) the effect of humic acid adsorption on the wettability of model edge surfaces of the laminar montmorillonite particles was estimated from a parallel study on silica and alumina surfaces, and only a slight decrease in the hydrophilicity was observed, whatever the pH of the liquid media. The ζ potentials of both clays in the absence and presence of humic acid were determined and the linkage between ζ potential and the electron-donor character of the materials is discussed.

Keywords

Humic Acid‘Rassoul’Sodium-montmorilloniteSurface Free EnergyWettability
Type
Research Article
Information
Clays and Clay Minerals , Volume 51 , Issue 1 , February 2003 , pp. 65 - 74
Copyright
Copyright © 2003, The Clay Minerals Society

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