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Modification of Wyoming montmorillonite surfaces using a cationic surfactant

Xi, Yunfei, Frost, Ray L., He, Hongping, Kloprogge, J. Theo, & Bostrom, Thor E. (2005) Modification of Wyoming montmorillonite surfaces using a cationic surfactant. Langmuir, 21(19), pp. 8675-8680.

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Abstract

Surfaces of Wyoming SWy-2-Na-montmorillonite were modified using ultrasonic and hydrothermal methods through the intercalation and adsorption of the cationic surfactant octadecyltrimethylammonium bromide (ODTMA). Changes in the surfaces and structure were characterized using X-Ray diffraction (XRD), thermal analysis (TG), and electron microscopy. The ultrasonic preparation method results in higher surfactant concentration within the montmorillonite interlayer when compared with the hydrothermal method. Three different molecular environments for surfactants within the surface modified montmorillonite are proposed based upon their different decomposition temperatures. Both XRD patterns and TEM images demonstrate that SWy-2-Na-montmorillonite contains superlayers. TEM images of organoclays prepared at high surfactant concentrations, show alternate basal spacings between neighbouring layers. SEM images show that modification with surfactant reduces the clay particle size and aggregation. Organoclays prepared at low surfactant concentration display curved flakes whereas they become flat with increasing intercalated surfactant. Novel surfactant modified montmorillonite results in the formation of new nanophases with the potential for the removal of organic impurities from aqueous media.

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98 citations in Web of Science®

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ID Code: 2147
Item Type: Journal Article
Additional Information: This article is freely available from the American Chemical Society website 12 months after the publication date. See links to publisher website in this record.
Keywords: nanochemistry, montmorillonite, organoclay, high resolution thermogravimetric analysis, X, ray diffraction, scanning electron microscopy, transmission electron microscopy
DOI: 10.1021/la051454i
ISSN: 0743-7463
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > ORGANIC CHEMISTRY (030500)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200)
Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > ANALYTICAL CHEMISTRY (030100)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2005 American Chemical Society
Deposited On: 15 Sep 2006
Last Modified: 29 Feb 2012 23:14

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