电沉积NiHCF薄膜在碱土金属溶液中的电控离子分离性能

doi:10.3724/SP.J.1077.2008.01115

无机材料学报

电沉积NiHCF薄膜在碱土金属溶液中的电控离子分离性能

鞠健, 郝晓刚, 张忠林, 刘世斌, 孙彦平

太原理工大学洁净化工研究所, 太原 030024

收稿日期:2007-12-19 修回日期:2008-03-03 出版日期:2008-11-20 网络出版日期:2008-11-20

Electrochemically Controlled Ion Separation Performances of Electrodeposited Nickel Hexacyanoferrate Thin Films in Alkaline Earth Metal Solution

JU Jian, HAO Xiao-Gang, ZHANG Zhong-Lin, LIU Shi-Bin, SUN Yan-Ping

Department of Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Received:2007-12-19 Revised:2008-03-03 Published:2008-11-20 Online:2008-11-20

摘要/Abstract

摘要： 采用电沉积方法在铂基体上制备出电活性NiHCF(Nickel Hexacyanoferrate)薄膜, 在碱土金属溶液中考察了薄膜电极对碱土金属离子的电控离子分离性能. 通过循环伏安法在0.1mol·L^-1 Mg(NO₃)₂、Ca(NO₃)₂、Sr(NO₃)₂
和Ba(NO₃)₂溶液中可逆置入和释放碱土金属离子, 比较了不同溶液中NiHCF膜电极的电活性、电化学行为和离子的置入机制; 在0.1mol·L^-1[Mg(NO₃)₂+Ba(NO₃)₂]混合溶液中结合电化学石英晶体微天平(EQCM)原位检测了不同浓度下膜电极氧化还原过程中的伏安特性曲线和频率响应, 分析了薄膜对Mg/Ba离子的选择性; 并通过XPS测定了氧化还原状态下NiHCF膜的化学组成及元素价态. 结果表明, NiHCF膜在二价碱土金属溶液中具有可逆的离子交换行为, 对Ba²⁺离子的选择性大于Mn²⁺离子, 通过电控离子分离方法可以实现碱土金属离子的有效分离.

关键词: NiHCF薄膜, 电控离子分离, 电沉积, 碱土金属

Abstract: Nickel hexacyanoferrate (NiHCF) thin films were synthesized on platinum substrates by cathodic deposition and the film-electrode systems were investigated as electrochemically controlled ion separation (ECIS) materials for the selective separation of alkaline earth ions in aqueous nitrate solutions. In 0.1 mol·L^-1 Mg(NO₃)₂, Ca(NO₃)₂, Sr(NO₃)₂ and Ba(NO₃)₂ solutions, cyclic voltammetry (CV) was used to reversibly intercalate and deintercalate alkaline earth cations from the matrix and to investigate the electroactivity, electrochemical behavior and the loading mechanism of NiHCF film electrodes. CV and electrochemical quartz crystal microbalance (EQCM) were used to investigate the ion selectivity of the films in 0.1 mol·L^-1 [Mg(NO₃)₂+Ba(NO₃)₂] mixture solution. The chemical composition and elemental valence of NiHCF films in reduced and oxidized form were also characterized by X-ray photoelectron spectroscopy (XPS). Experimental results show that the cathodically deposited NiHCF film electrodes have reversible electrochemical behavior in alkaline earth metal solution and display a high Ba²⁺ selectivity in Mg^2+/Ba²⁺ mixtures. The alkaline earth metal ions can be separated effectively by ECIS processes.

Key words: nickel hexacyanoferrate thin film, electrochemically controlled ion separation, electrodeposition, alkaline earth metal

中图分类号:

TQ035

鞠健,郝晓刚,张忠林,刘世斌,孙彦平. 电沉积NiHCF薄膜在碱土金属溶液中的电控离子分离性能[J]. 无机材料学报, DOI: 10.3724/SP.J.1077.2008.01115.

JU Jian,HAO Xiao-Gang,ZHANG Zhong-Lin,LIU Shi-Bin,SUN Yan-Ping. Electrochemically Controlled Ion Separation Performances of Electrodeposited Nickel Hexacyanoferrate Thin Films in Alkaline Earth Metal Solution[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.01115.

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电沉积NiHCF薄膜在碱土金属溶液中的电控离子分离性能

Electrochemically Controlled Ion Separation Performances of Electrodeposited Nickel Hexacyanoferrate Thin Films in Alkaline Earth Metal Solution

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