室温氯化铜-氯化钠溶液中铜氯络合物浓度的电化学分析

张艳清; 李和平; 刘庆友; 徐丽萍; 张磊

室温氯化铜-氯化钠溶液中铜氯络合物浓度的电化学分析

1.
中国科学院地球化学研究所, 贵州贵阳 550002
2.
中国科学院研究生院, 北京 100049
3.
中国科学院地球化学研究所, 贵州贵阳 550002
4.
中国科学院地球化学研究所, 贵州贵阳 550002
5.
中国科学院地球化学研究所, 贵州贵阳 550002
6.
安徽省地质测绘技术院, 安徽合肥 230022

基金项目:

中国科学院大型设备研制项目(YZ200720)

国家自然科学基金项目(40573046)

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- 收稿日期: 2010-12-05

Electrochemical Analysis of the Concentration of Cupric Chloride Complex in CuCl₂-NaCl Solution at Room Temperature

1.
Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
2.
Graduate University of Chinese Academy of Sciences, Bejing 100049, China
3.
Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
4.
Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
5.
Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
6.
Anhui Institute of Geological Surveying and Mapping, Hefei 230022, China

摘要

摘要: 运用Tafel极化曲线和线性电势扫描法研究了常温弱酸性CuCl₂-NaCl溶液中铜氯络合物体系的电化学放电机理。通过测量不同浓度配比的CuCl₂-NaCl溶液的极化曲线得到各自的交换电流密度,然后根据电化学反应级数法计算直接在电极上放电的Cu(Ⅱ)-Cl络合物的配位数。并且运用线性电势扫描法进一步研究了此络合物在铂电极上的还原反应,在体系可逆的情况下计算得到其发生放电反应的离子浓度。结果表明:溶液中存在的主要络离子是[CuCl]⁺,在铂电极上发生电化学反应的铜络离子是[CuCl]⁺。铜氯络离子在铂电极上的还原反应分两步进行,其中第一步为可逆的单电子还原过程,体系中[CuCl]⁺和Cu的电化学反应级数均为一级;4.000 mol/L NaCl-0.100 mol/L CuCl₂溶液体系中发生放电反应的[CuCl]⁺的浓度为0.086 mol/L。研究结果为目前学术界存在广泛分歧的Cu²⁺在高浓度氯离子溶液中的放电机理提供了重要的实验依据,同时对未来湿法冶金、地质和地球化学等领域中溶解态金属络合物的电化学分析具有一定的借鉴作用。
- 常温 /
- Tafel曲线 /
- 伏安曲线 /
- 铜氯络合物 /
- 电化学
Abstract: The electrochemical reaction mechanism of CuCl₂-NaCl weak acid solution was studied by the Tafel method and linear potential sweep voltammetry at room temperature. The exchange current densities at different concentration ratios of CuCl₂-NaCl solution were obtained from their polarization curves and the coordination number of the electrochemical reduction complex was calculated from electrochemical reaction order method. The electrochemical reduction on Pt electrode was further studied by linear potential sweep voltammetry. Finally, the concentration of the electrochemical reduction complex ion was calculated when the procedure was reversed. The results were shown that [CuCl]⁺ is the main cupric chloride complex in solution and the one for electrochemical reduction on Pt electrode. Two one-electron reduction steps of the copper chloride complex were observed on the surface of the Pt electrode. The first step was a one-electron-transfer reversible reduction process. The electrochemical reaction orders of [CuCl]⁺ and Cu in the system were both level one. In 4.000 mol/L NaCl+0.100 mol/L CuCl₂ solution, the concentration of the electrochemical reduction reactant ([CuCl]⁺) was 0.086 mol/L. The results provided important experimental evidences for electrochemical reduction mechanism of Cu²⁺ in aqueous solutions with highly concentrated chloride ions. This work can also be used as a reference for electrochemical analysis of dissolved metal complex in the fields of metallurgy, geology, geochemistry in the future.
- room /
- temperature /
- Tafel /
- curve /
- voltammetric

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室温氯化铜-氯化钠溶液中铜氯络合物浓度的电化学分析

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Electrochemical Analysis of the Concentration of Cupric Chloride Complex in CuCl2-NaCl Solution at Room Temperature

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Electrochemical Analysis of the Concentration of Cupric Chloride Complex in CuCl₂-NaCl Solution at Room Temperature