Effect of Hydrocarbon Chain Length on Adsorption of Cationic Surfactants onto Clinoptilolite

Abstract

The adsorption behavior of quaternary ammonium cationic surfactants with different hydrocarbon chain lengths, i.e. HDTMA (hexadecyltrimethylammonium), TDTMA (tetradecyltrimethylammonium) and DDTMA (dodecyltrimethylammonium), onto clinoptilolite has been investigated. The adsorption isotherms of these surfactants are correlated with the z potential curves of clinoptilolite. Accordingly, the applicability of the hemimicelle hypothesis to the adsorption of cationic surfactants at the clinoptilolite/water interface considering in the electrical double layer (EDL) of clinoptilolite is discussed. Even though the adsorption occurs in the EDL of clinoptilolite, the adsorption of HDTMA, TDTMA and DDTMA onto clinoptilolite is not conveniently described by the hemimicelle hypothesis. The absence of all expected marked increase in the z potential curves at the hemimicelle concentration is ascribed to the large external cation exchange capacity (ECEC) of clinoptilolite. The hydrocarbon chain length of surfactant molecules is found to have a significant effect on the ion exchange as well as hydrophobic interaction mechanisms. The effectiveness of both ion exchange and hydrophobic interactions increases with increasing chain length, and so the greatest surfactant adsorption onto clinoptilolite was obtained by HDTMA.

Removal of As (III) from Aqueous Solutions Using Montmorillonite

“…The concentration of arsenic (III) was determined spectrophotometrically procedure using LCV as reported [12].…”

Alkyl dimethyl benzyl ammonium chloride adsorption mechanism on wood

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“…Therefore zeta potential data have been used to explain the adsorption mechanisms of ionic surfactants (Ersoy and Celik 2003;Paria and Khilar 2004;Somasundaran et al 1964) and should provide insight into the adsorption of quat at the wood/water interface.…”

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