Abstract
The adsorption of hexadecyltrimethylammonium (HDTMA) cations on swelling layer silicates (montmorillonites) was studied by adsorption isotherms, X-ray diffraction, and electron microscopy. At low HDTMA concentrations, HDTMA ions started to be adsorbed on interlayer sites of SWy montmorillonite, causing a preferential release of interlayer Na+ compared with Ca2+, while the lateral attraction between adsorbed HDTMA cations at edges or external surfaces highly prevailed in SAz montmorillonite. Montmorillonite clay surfaces appeared as foliated and irregular aggregate structures at high HDTMA loadings. Besides the clay surface charge, the interlayer inorganic cations appeared to have a substantial influence on the expansion behavior of silicate layers as well as the evolution of the surface aggregates as a function of HDTMA surface coverage.
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Lee, S.Y., Kim, S.J. Study on the exchange reaction of HDTMA with the inorganic cations in reference montmorillonites. Geosci J 7, 203–208 (2003). https://doi.org/10.1007/BF02910286
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DOI: https://doi.org/10.1007/BF02910286