导电聚合物改性阳离子交换膜提高一价离子选择性  

CATION EXCHANGE MEMBRANES MODIFIED BY CONDUCTIN GPOLYMERTO IMPROVE THE MONOVALENT ION SELECTIVITY

作　　者：王翠[1] 王三反[1] 李广[1] 武彦斌[1] 

机构地区：[1]兰州交通大学寒旱地区水资源综合利用教育部工程研究中心,甘肃兰州730070

出　　处：《水处理技术》2014年第12期19-23,34,共6页Technology of Water Treatment

基　　金：国家科技支撑计划课题(2012BAF03B06)

摘　　要：对近年来导电聚合物改性阳离子交换膜的研究进行了综述和分析。导电电子聚合物与离子交换膜合成复合材料,在电渗析过程中增强离子的选择性。离子交换膜电渗析最重要的一个应用是从湿法冶金废酸液和电镀废水中回收强酸,这些过程的溶液通常含有多价金属离子,因此需要使用能优先选择透过一价阳离子的特定阳离子交换膜。而在电渗析法海水浓缩时,只有优先通过一价离子,阻止二价离子通过,才能有效提高脱盐率和电流效率,避免形成硫酸钙沉淀,以减轻膜污染和保证电渗析器长期稳定运行。显然,实现上述两个过程要求的一个有效途径是赋予阳离子交换膜一价离子选择性。因此,研究提高阳离子交换膜对阳离子间选择性的各种改性方法很重要。The researches of cation exchange membranes modified by conducting polymer in recent years are reviewed and analyzed. Electric conducting polymer and ion exchange membranes synthesize composites,which enhance ion selectivity in the electrodialysis process. The electrodialysis recycling of strong acids from effluents of hydrometallurgy and electroplating processes was one of the most important applications by using ion exchange membrane. Solutions of these processes are generally concentrated with multivalent metal ions,therefore,some specific cation exchange membranes which are preferentially selective to monovalent cations are needed.In the concentration of seawater using electrodialysis,the priority of monovalent ions and blocking divalent ions can effectively improve the desalination rate and current efficiency and avoid the formation of calcium sulfate precipitation,which can reduce membrane pollution and ensure long-term stable operation of the electrodialyzer.Obviously,the effective way to achieve the former two processes is to endow cation exchange membrane monovalent ion selectity. Therefore,it is important to develop a variety of modification methods to improve the cationselectivity of cation exchange membranes.

关 键 词：阳离子交换膜 导电聚合物 一价离子选择性 表面改性 

分 类 号：TQ028.8[化学工程]