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Structure of organoclays - an x-ray diffraction and thermogravimetric analysis study

Xi, Yunfei, Ding, Zhe, & Frost, Ray L. (2004) Structure of organoclays - an x-ray diffraction and thermogravimetric analysis study. Journal of Colloid and Interface Science, 277(1), pp. 116-120.

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Abstract

X-ray diffraction has been used to study the changes in the surface properties of a montmorillonitic clay through the changes in the basal spacings of montmorillonite (SWy-2) and surfactant-intercalated organo-clays. Variation in the d-spacing was found to be a step-function of the surfactant concentration. High resolution thermogravimetric analysis (HRTG) was used to study the thermal decomposition surfactant modified SWy-2-MMTs modified with the surfactant octadecyltrimethylammonium bromide. High resolution thermogravimetry shows the decomposition takes place in 4 steps. A mass loss step is observed at room temperature and is attributed to dehydration of adsorption water. A second mass loss step is observed over the 87.9 to 135.5 degrees Celsius temperature range and is also attributed to dehydration of water hydrating metal cations such as Na+ . The third mass loss occurs from 178.9 to 384.5 degrees Celsius and is assigned to a loss of surfactant. The fourth mass loss step is ascribed to the loss of OH units through dehydroxylation over the 556.01 to 636.35 degrees Celsius temperature range.

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131 citations in Web of Science®

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ID Code: 847
Item Type: Journal Article
Keywords: montmorillonite, dehydration, dehydroxylation, organo, clay, X, ray diffraction, high, resolution thermogravimetric analysis
DOI: 10.1016/j.jcis.2004.04.053
ISSN: 0021-9797
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2004 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher: This journal is available online.
Deposited On: 29 Jul 2005
Last Modified: 29 Feb 2012 23:08

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