Location and migration of cations in Cu2+-adsorbed montmorillonite

被引:82
作者
He, HP [1 ]
Guo, JG [1 ]
Xie, XD [1 ]
Peng, JL [1 ]
机构
[1] Chinese Acad Sci, Guangzhou Inst Geochem, Canton 510640, Peoples R China
基金
中国国家自然科学基金;
关键词
Cu ion; DTA; EPR; montmorillonite; XRD;
D O I
10.1016/S0160-4120(01)00011-3
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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.
引用
收藏
页码:347 / 352
页数:6
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