Abstract
The adsorption of aromatic compounds (2-chlorophenol 2-naphthol) in the presence of cationic C16-surfactants by different clays (kaolin, illite, and bentonite (montmorillonite)) from water was studied. — The cationic surfactants alter the adsorption properties of clays by means of surface hydrophobing, which leads to a drastic increase and acceleration of the adsorption of these aromatic pollutants. If the surface is densely covered by surfactant ions, high exothermic heats of displacement for 2-naphthol are found by microcalorimetry. X-ray diffraction measurements of the basal spacing proved the intercalation of 2-chlorophenol within the hydrophobic interlayers of C16-bentonite. At very high surfactant concentrations (c ≫ CMC) the decreased adsorption of 2-naphthol was explained by a competition for 2-naphthol molecules between micelles and hydrophobic adsorbed surfactant layer.
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© 1992 Dr. Dietrich Steinkopff Verlag GmbH & Co. KG
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Klumpp, E., Heitmann, H., Lewandowski, H., Schwuger, M.J. (1992). Enhancing effects during the interaction of cationic surfactants and organic pollutants with clay minerals. In: Helm, C., Lösche, M., Möhwald, H. (eds) Trends in Colloid and Interface Science VI. Progress in Colloid & Polymer Science, vol 89. Steinkopff. https://doi.org/10.1007/BFb0116307
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DOI: https://doi.org/10.1007/BFb0116307
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