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An infrared study of adsorption of paranitrophenol on mono, di and trialkyl surfactant intercalated organoclays

Frost, Ray L., Zhou, Qin, He, Hongping, & Xi, Yunfei (2008) An infrared study of adsorption of paranitrophenol on mono, di and trialkyl surfactant intercalated organoclays. Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy, 69(1), pp. 239-244.

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Abstract

Infrared spectroscopy has been used to study the adsorption of paranitrophenol on mono, di and tri alkyl surfactant intercalated montmorillonite. Organoclays were obtained by the cationic exchange of mono, di and tri alkyl chain surfactants for sodium ions [hexadecyltrimethylammonium bromide (HDTMAB), dimethyldioctadecylammonium bromide (DDOAB), methyltrioctadecylammonium bromide (MTOAB)] in an aqueous solution with Na-montmorillonite. Upon formation of the organoclay, the properties change from strongly hydrophilic to strongly hydrophobic. This change in surface properties is observed by a decrease in intensity of the OH stretching vibrations assigned to water in the cation hydration sphere of the montmorillonite. As the cation is replaced by the surfactant molecules the paranitrophenol replaces the surfactant molecules in the clay interlayer. Bands attributed to CH stretching and bending vibrations change for the surfactant intercalated montmorillonite. Strong changes occur in the HCH deformation modes of the methyl groups of the surfactant. These changes are attributed to the methyl groups locking into the siloxane surface of the montmorillonite. Such a concept is supported by changes in the SiO stretching bands of the montmorillonite siloxane surface. This study demonstrates that paranitrophenol will penetrate into the untreated clay interlayer and replace the intercalated surfactant in surfactant modified clay, resulting in the change of the arrangement of the intercalated surfactant.

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ID Code: 41983
Item Type: Journal Article
Additional Information: This is the work of student Qin Zhou
Keywords: montmorillonite, organoclay, high resolution thermogravimetric analysis, X-ray diffraction, scanning electron microscopy, transmission electron microscopy
DOI: 10.1016/j.saa.2007.02.023
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Divisions: Past > Schools > Chemistry
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2008 Elsevier
Copyright Statement: NOTICE: this is the author’s version of a work that was accepted for publication in Spectrochimica Acta Part A. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy, 69(1), pp. 239-244.
Deposited On: 16 Jun 2011 10:01
Last Modified: 01 Mar 2012 10:15

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