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Location and migration of cations in Cu2+-adsorbed montmorillonite

He, Hongping, Guo, Jiugao, Xie, Xiande, & Peng, Jinlian (2001) Location and migration of cations in Cu2+-adsorbed montmorillonite. Environment International, 26(5-6), pp. 347-352.

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Abstract

Location of Cu2+ ion in Cu2+-adsorbed montmorillonite have been studied by electron paramagnetic resonance (EPR), supplemented by X-ray diffraction (XRD) and differential thermal analysis (DTA). In the EPR spectra of Cu2+-adsorbed montmorillonite, three signals, corresponding to Cu2+ ion, have been simultaneously recorded. Some Cu2+ ion seemed to replace the original interlayer metal cations and some entered into the hexagonal cavities. A small fraction of Cu2+ ion penetrated into the octahedral vacancies. There were two ways for the adsorption of Cu2+ ion by montmorillonite — exchangeable and specific. On heating, the hydrated Cu2+ ion in the interlayer loses the coordinating water and then enters into the hexagonal cavities. When the heating temperature further increased, dehydroxylation occurs, which facilitates Cu2+ ion in the hexagonal cavities to penetrate into the octahedral vacancies.

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ID Code: 1487
Item Type: Journal Article
Keywords: Cu ion, DTA, EPR, Montmorillonite, XRD, adsorption, Heavy metal, Enviromental Science
DOI: 10.1016/S0160-4120(01)00011-3
ISSN: 0160-4120
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 2001 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 08 Jun 2005
Last Modified: 09 Jun 2010 22:25

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