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Solid-state intercalation of cationic surfactants into Tunisian smectites

Published online by Cambridge University Press:  09 July 2018

S. Gamoudi*
Affiliation:
Laboratory of Physical Chemistry of Inorganic Materials and their Applications, National Center for Research in Materials Science, Tunisia
N. Frini-Srasra
Affiliation:
Department of Chemistry, Faculty of Sciences, University of El Manar, Tunisia
E. Srasra
Affiliation:
Laboratory of Physical Chemistry of Inorganic Materials and their Applications, National Center for Research in Materials Science, Tunisia

Abstract

Intercalation of cationic surfactants hexadecylpyridinium (HDPy+) and hexadecyltrimethylammonium (HDTMA+) into the interlayer space of homoionic (Na-, Ca- and Zn-) smectites by solid-solid reactions was investigated. These reactions were complete within 15 min. Changes in the surface and structure of the smectites modified with different surfactants were characterized using XRD, FTIR and DSC. The intercalation of surfactant is controlled by the exchangeable cation of smectite and monofunctional ammonium cation type. HDPy+ and HDTMA+ surfactants were retained by Zn-exchanged smectite, suggesting important surface properties (CEC = 80 meq/100 g clay, SBET = 116.5 m2/g) and acid-base properties (point of zero proton charge PZC, density charge σH). HDPy cation loading was effective, suggesting that the aromatic polar group is favoured for intercalation. Comparing with original clay, modification with surfactants increased the basal spacings d001. Based on the d001 spacing of modified smectites, different configurations of surfactants within smectite interlayer were proposed as a function of surfactant concentration, which were examined by FTIR and DSC.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2013

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