电化学控制的离子交换技术

Electrochemically Switched Ion Exchange

电化学控制离子交换(electrochemically switched ion exchange,ESIX)是电化学与离子交换相结合的新型离子分离技术,通过电化学方法调节导电基体上电活性ESIX膜的氧化/还原状态来控制离子的置入与释放,从而使溶液中的离子得到分离,并使膜得到再生。ESIX消除了传统离子交换技术在化学再生过程中产生的二次污染问题,因其环境友好性在废水处理及水质净化领域具有良好的应用前景而逐渐成为备受关注的热点问题。本文简述了ESIX技术的机理和特点,着重阐述了有关ESIX膜的制备、结构及其应用方面的研究进展,并指出了需要研究的科学问题与研究前景。

Electrochemically switched ion exchange（ESIX） is a novel ion separation technology which combines electrochemistry with ion-exchange via reversible electrochemical modulation of the matrix charge density.Ion loading and unloading can be easily controlled by changing the redox states of ESIX films formed on conductive substrates to separate ions from mixed solutions and regenerate the matrix.The secondary waste created by chemical regeneration and associated rinse water of conventional ion exchange technology is eliminated.ESIX technology has gradually become a hot issue in the fields of wastewater treatment and water purification due to its environment friendliness.This paper begins with a brief introduction to the mechanisms and characteristics of ESIX technology,and then the research progress of ESIX films including preparation,structure and application are outlined.Furthermore,the key issues needed to be solved and the research prospect of this technology is also recommended in this paper.