Study on the recovery of ionic liquids from dilute effluent by electrodialysis method and the fouling of cation-exchange membrane  

作　　者：BAI Lu WANG XiaoLiang NIE Yi DONG HaiFeng ZHANG XiangPing ZHANG SuoJiang 

机构地区：[1]Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Multiphase Complex Systems,Institute of Process Engineering, Chinese Academy of Science [2]College of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences

出　　处：《Science China Chemistry》2013年第12期1811-1816,共6页中国科学（化学英文版）

基　　金：supported by the National Basic Research Program of China(973 Program)(2013CB733506);the National Natural Science Foundation of China(21036007,21076113)

摘　　要：With the wide application of ionic liquids(ILs)in various fields,developing efficient techniques to recover ILs from effluent is an urgent demand for the cost reduction and the environmental protection.In this study,an electrodialysis(ED)method was used to recover 1-butyl-3-methylimidazolium chloride([Bmim]Cl)IL from aqueous solution as model effluent.The influences of initial IL concentration and applied voltage on the current efficiency,removal ratio,desalination ratio,membrane flux and specific energy consumption during the ED process were investigated.It was found that the removal ratio and desalination ratio increases with the increasing of initial IL concentration and applied voltage.The current efficiency decreases with the increasing of initial IL concentration and the current efficiency reached the maximum value of 94.3%at 25 V.Besides,as the applied voltage increases,the membrane flux increases and the specific energy consumption decreases.Moreover,the fouling of cation-exchange membrane was also discovered after the desalination of IL.The deposits on the surface or into the membrane which is probably caused by[Bmim]+was characterized by scanning electron microscopy,elemental analysis and Fourier transform infrared.With the wide application of ionic liquids （ILs） in various fields, developing efficient techniques to recover ILs from effluent is an urgent demand for the cost reduction and the environmental protection. In this study, an electrodialysis （ED） method was used to recover 1-butyl-3-methylimidazolium chloride （[Bmim]Cl） IL from aqueous solution as model effluent. The influences of initial IL concentration and applied voltage on the current efficiency, removal ratio, desalination ratio, membrane flux and specific energy consumption during the ED process were investigated. It was found that the removal ratio and desalination ra- tio increases with the increasing of initial IL concentration and applied voltage. The current efficiency decreases with the in- creasing of initial IL concentration and the current efficiency reached the maximum value of 94.3% at 25 V. Besides, as the applied voltage increases, the membrane flux increases and the specific energy consumption decreases. Moreover, the fouling of cation-exchange membrane was also discovered after the desalination of IL. The deposits on the surface or into the mem- brane which is probably caused by [Bmim]＋ was characterized by scanning electron microscopy, elemental analysis and Fouri- er transform infrared.

关 键 词：ionic liquid ELECTRODIALYSIS membrane EFFLUENT RECOVERY 

分 类 号：X703[环境科学与工程—环境工程]