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Citation: WANG Wen-Hua, ZHAO Lin, YAN Bo, TAN Xin, HE Bo, PAN Zhi-Yun. Effects of Concentration and Freeze-Thaw Treatment on the Local Structure of Cu²⁺ in CuCl₂ Aqueous Solutions[J]. Acta Physico-Chimica Sinica, ;2010, 26(02): 265-269. doi: 10.3866/PKU.WHXB20100206 shu

Effects of Concentration and Freeze-Thaw Treatment on the Local Structure of Cu²⁺ in CuCl₂ Aqueous Solutions

1.
School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, P. R. China; National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, P. R. China

Received Date: 21 September 2009
Available Online: 17 December 2009

The microscopic local environmental structure of Cu2+ ions in copper chloride solutions was investigated by X-ray absorption fine structure (EXAFS) spectroscopy. The effects of salt concentration and freeze-thaw (FT) treatment on the first coordination shell of Cu2+ were analyzed by examining the Cu K edge EXAFS spectra of CuCl2 aqueous solutions before and after FT treatment at various concentrations. The EXAFS results show that Cu2+ has 3.0-4.3 oxygen nearest neighbors with Cu—O bond length of 0.192 -0.198 nm in the first coordination shell. These structural properties can be ascribed to the Jahn-Teller effect. We found differences in the microscopic local structure of Cu2+ for various concentrations in CuCl2 aqueous solutions.With an increase in the salt concentration, the coordination number of Cu2+ decreases and the Cu—O bond length increases in the first coordination shell. The influence of FT treatment on the microscopic local environmental structure of Cu2+ was determined fromthe fitting results of the structural parameters. The coordination number of Cu2+ in its first coordination shell and the degree of thermal disorder increase when the FT treatment is operated in CuCl2 aqueous solutions.
- EXAFS,
- CuCl2 aqueous solution,
- Structure of hydrated ion,
- Coordination number,
- Concentration,
- Freeze-thaw treatment
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Effects of Concentration and Freeze-Thaw Treatment on the Local Structure of Cu2+ in CuCl2 Aqueous Solutions

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通讯作者: 陈斌, bchen63@163.com

Effects of Concentration and Freeze-Thaw Treatment on the Local Structure of Cu²⁺ in CuCl₂ Aqueous Solutions