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Location and migration of cations in Cu(2+)-adsorbed montmorillonite.

Abstract：

:Locations of Cu2+ ion in Cu(2+)-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 Cu(2+)-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.

journal_name

Environ Int

journal_title

Environment international

authors

He HP,Guo JG,Xie XD,Peng JL

doi

10.1016/s0160-4120(01)00011-3

subject

Has Abstract

pub_date

2001-05-01 00:00:00

pages

347-52

issue

5-6

eissn

0160-4120

issn

1873-6750

pii

S0160-4120(01)00011-3

journal_volume

26

pub_type

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