Location and migration of cations in Cu2+-adsorbed montmorillonite
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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|Item Type:||Journal Article|
|Keywords:||Cu ion, DTA, EPR, Montmorillonite, XRD, adsorption, Heavy metal, Enviromental Science|
|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 12:25|
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