Journal
ENVIRONMENT INTERNATIONAL
Volume 26, Issue 5-6, Pages 347-352Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0160-4120(01)00011-3
Keywords
Cu ion; DTA; EPR; montmorillonite; XRD
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Locations 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+ ions seemed to replace the original interlayer metal cations and some entered into the hexagonal cavities. A small fraction of Cu2+ ions 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. (C) 2001 Elsevier Science Ltd. All rights reserved.
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