电沉积铁氰化镍薄膜的电控离子交换性能  

Electrochemically switched ion exchange properties of electrodeposited nickel hexacyanoferrate thin films

作　　者：郝晓刚[1] 郭金霞[1] 张忠林[1] 刘世斌[1] 孙彦平[1] 

机构地区：[1]太原理工大学洁净化工研究所,山西太原030024

出　　处：《化工学报》2005年第12期2380-2386,共7页CIESC Journal

基　　金：国家自然科学基金项目(20006011);山西省自然科学基金项目(20021017);回国留学人员基金项目(2004-24).~~

摘　　要：采用电沉积方法在不同导电基体上制备出具有电化学控制离子交换(ESIX)性能的电活性NiHCF(nickelhexacyanoferrate)薄膜.在1mol·L-1KNO3溶液中采用电势循环可逆地置入与释放碱金属离子,比较了铂、铝和石墨基体上薄膜的电活性、离子交换容量及再生能力;在1mol·L-1(KNO3+CsNO3)混合溶液中测定了不同浓度下薄膜的伏安特性曲线和电化学交流阻抗谱,分析了薄膜对Cs/K离子的选择性.重点考察了制膜液组成对薄膜电化学性能的影响,通过EDS测定薄膜组成并结合循环伏安曲线分析了薄膜组成和结构与其电化学特性之间的关系.实验表明,3种基体材料上均能制得性能稳定的NiHCF膜,铝和石墨基体上的NiHCF薄膜同样具有良好的ESIX性能;控制制膜液组成可得到不同组分占优的膜,由此可筛选较为理想的ESIX膜材料.Thin films of cathodically deposited nickel hexacyanoferrate （NiHCF） on different substrates were investigated as electrochemically switched ion exchange （ESIX） materials for the selective separation of alkali cations in aqueous nitrate solutions. The films were deposited on platinum, aluminum and graphite substrates with different preparation conditions. In 1 mol·L^-1 KNO3 solution cyclic voltammetry （CV） was used to reversibly intercalate and deintercalate K^＋ from the matrix and to investigate the electroactivity, ion-exchange capacity and the regeneration capability of NiHCF films. In 1 mol·L^-1 （KNO3＋CsNO3） mixture solution CV combining electrochemical impedance spectra （EIS） was used to investigate the ion selectivity of the films. The effect of synthesis condition on electrochemical performance of the films and the relationship between composition and electrochemical behavior of the NiHCF films were also studied by using CV and energy dispersive X-ray spectroscopy （EDS）. Experimental results showed that different electrolytic solutions could prepare different NiHCF films which were dominated by either ＂soluble＂ or ＂insoluble＂ structure and the electroactive NiHCF films could be successfully deposited onto Pt, AI and graphite substrates. The NiHCF films formed on graphite and AI substrates also had good ESIX performance.

关 键 词：电化学控制离子交换 铁氰化镍薄膜 电沉积 制备 

分 类 号：TQ035[化学工程]