石墨基体NiHCF薄膜的离子交换性能  

Ion Exchange Performances of Nickel Hexacyanoferrate Thin Films on Graphite Substrate

作　　者：张玫[1] 郝晓刚[1] 马旭莉[1] 刘世斌[1] 樊彩梅[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：《稀有金属材料与工程》2006年第A02期249-253,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(20006011;20476070);山西省自然科学基金(20021017);回国留学人员基金(2004-24)资助项目

摘　　要：以石墨为基体材料,采用电沉积和毛细化学沉积方法制备出电活性NiHCF薄膜。通过EDS和SEM考察了薄膜组成及其形貌,在1 mol／l KNO3溶液中采用电势循环可逆地置入与释放K离子,比较了不同制备方法得到的NiHCF薄膜的电活性、离子交换容量、再生性能和循环寿命:在1 mol／l(KNO3+CsNO3)混合溶液中测定了不同浓度下薄膜的伏安特性曲线,分析了薄膜对Cs+／K+的选择性。实验表明,石墨基体上制得的NiHCF膜能实现电化学控制的离子变换(ESIX)过程;两种方法制得的薄膜对Cs+均有较强的选择性,其中电沉积膜的再生速度高于化学沉积膜,而化学沉积膜的寿命高于电沉积膜。The electroactive nickel hexacyanoferrate （NiHCF） thin films were prepared on graphite substrates by cathodic deposition and capillary chemical deposition, respectively. The composition and morphology of the NiHCF thin film were investigated using EDS and SEM. In 1mol/L KNO3 solution, potential cycling in the range 0-1000 mV vs SCE was used to reversibly intercalate and deintercalate K^＋ from the matrix and to compare the electroactivity, ion-exchange capacity, regenerability and cycle life of NiHCF films. In 1mol/L （KNO3＋CsNO3） mixture solutions, cyclic voltammetry （CV） was used to investigate the ion selectivity of the films. Experimental results show that the NiHCF thin films formed on graphite substrates are suitable for electrochemically switched ion-exchange （ESIX） process, that the films display a high Cs^＋ selectivity and that the regeneration speed of cathodically deposited film is higher than that of chemically deposited film but the cycle life or stability is contrary.

关 键 词：电化学控制离子交换 铁氰化镍膜 电沉积 毛细化学沉积 

分 类 号：O611.3[理学—无机化学]