A physico-chemical study of the cationic surfactants adsorption on montmorillonite

Journal of the Brazilian Chemical Society

Petr Praus¹  Martina Turicová¹ 

[1] ,VSB-Technical University Ostrava Department of Analytical Chemistry and Material Testing Ostrava,Czech Republic

关键词: adsorption isotherms;    montmorillonite;    cetyltrimethylammonium;    cetylpyridinium;    capillary isotachophoresis;   

DOI  :  10.1590/S0103-50532007000200020

来源: SciELO

【 摘 要 】

The adsorption of cetyltrimethylammonium (CTA) bromide and cetylpyridinium (CP) chloride on Na+-rich montmorillonite (MMT) was studied. An ad hoc isotachophoretic (ITP) method was developed for the simultaneous and rapid determination of the cationic surfactants (CSs) adsorbed. In order to decrease the detection limits, ITP was on-line coupled with capillary zone electrophoresis. Adsorption data were analysed by their fitting with adsorption isotherms. The adsorption of CP is well described by the Langmuir isotherm. It indicates the monolayer arrangement of CP on the MMT surface. In case of the CTA data, the best fitting Langmuir-Freundlich model with the power constant r<1 was found. It can be explained by the CTA interactions because of its intercalation into the MMT interlayer space.

【 授权许可】

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