膜科学与技术

离子交换膜传质过程中电化学特性的研究

作者：张文娟，马军，王执伟，刘惠玲

单位：哈尔滨工业大学市政环境工程学院城市水资源与环境国家重点实验室，黑龙江哈尔滨 150090

关键词：离子交换膜；电阻；直流法；电化学阻抗谱；双电层；扩散边界层

出版年,卷(期):页码： 2017,37(1):44-50

摘要：

电化学阻抗谱和直流方法均可用来评价离子交换膜传质过程中的电化学性质，而前者可用于分析膜本身、双电层和扩散边界层的电阻值。本文通过比较两个等效电路的拟合效果及其物理化学意义，选择了最优的等效电路来定量分析离子交换膜体系的各个分层，并考察不同流速和浓度下两种膜的电化学性质变化。研究发现：直流方法测定的电阻值等于电化学阻抗谱测定的各个分层的电阻值之和；随着流速的增大，膜本身和双电层的电阻变化较小，而扩散边界层的电阻明显降低；随着浓度的增大，传质体系的电阻均显著降低；阳离子交换膜和阴离子交换膜具有不同的电化学传质特性。研究结果对于优化离子交换膜的电化学评价技术及离子交换膜的制备和应用具有重要意义。

Electrochemical impedance spectroscopy (EIS) and direct current method (DC) can be used to investigate the electrochemical properties in the mass transport of ion exchange membrane (IEM). The resistance of membrane, electrical double layer (EDL) and diffusion boundary layer (DBL) can be analyzed separately by EIS. With the comparison of two equivalent circuits and in terms of their physical and electrochemical interpretations, a better equivalent circuit was selected, and the effect of flow rate on electrochemical properties of two membranes was investigated It is found that the resistance determined from DC was equal to the sum of each sublayer’s resistance in IEM systems from EIS; when the flow rate increased, the resistance of membrane and EDL did not change significantly, while the DBL resistance decreased obviously; with the increase of concentration, the resistance of mass transport system decreased significantly; the transport properties in cation exchange membrane and anion exchange membrane were different. Research results are of major importance for developments of characterization techniques on membrane transport properties and applications of IEMs.

第一作者简介：张文娟（1986-），女，山东泰安人，博士，主要从事方向为膜材料与膜过程及电化学性质的研究，E-mail: wenjuanvivian@126.com. *通讯作者，E-mail: majun@hit.edu.cn

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