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Studies on Interaction of Dodecyltrimethylammonium Bromide with Na- and Al-Montmorillonite

✍ Scribed by Jingjun Pan; Guanying Yang; Buxing Han; Haike Yan

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
98 KB
Volume
194
Category
Article
ISSN
0021-9797

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✦ Synopsis

The adsorption isotherms and adsorption enthalpies of dodecyltrimethylammonium bromide (DDTMAB) on Na- and Al-montmorillonite were determined in the pH range 2-12. The basal spacings of the clays were also studied by X-ray diffraction. Interactions of DDTMAB with the two montmorillonites predominate mostly through cation exchange in the pH range studied. In the case of Na-montmorillonite, the amount of adsorption increases with pH, but adsorption enthalpy decreases with pH. For Al-montmorillonite, adsorption enthalpy exhibits nonmonotonic variation with pH, although the amount of adsorption increases with pH monotonously. The adsorption enthalpies of DDTMAB on the clays are negative. The adsorbed DDTMAB molecules in clay interlayers present a bilayer arrangement at saturation. Copyright 1997 Academic Press. Copyright 1997Academic Press

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