分离膜孔结构的电化学交流阻抗谱表征  

Characterization of Pore Structure in Separation Membrane by Electrochemical Impedance Spectroscopy

作　　者：王帅 尹成 周伟琪 林志东[1] 付萍[1] 陈喆[1] 张勇[1] 吴江渝[1] 海吉忠 杨小波 刘海平 

机构地区：[1]等离子体化学与新材料湖北省重点实验室(武汉工程大学),湖北武汉430205 [2]青海盐湖工业股份有限公司青海盐湖资源综合利用重点实验室,青海格尔木816000

出　　处：《武汉工程大学学报》2017年第5期466-470,共5页Journal of Wuhan Institute of Technology

基　　金：国家自然科学基金(NSFC11205118);青海盐湖资源综合利用重点实验室开放基金(Q-SYS-201516-KF-04;Q-SYS-201516-KF-05)

摘　　要：利用电化学工作站的电化学交流阻抗谱构建一种测量分离膜通孔结构的电化学表征技术.通过改变聚乙烯吡咯烷酮的质量分数,制备具有不同孔洞结构的聚砜分离膜.采用电化学工作站、孔容积分析仪、膜性能测试装置对分离膜的孔结构和水通量进行分析.结果表明:随着聚乙烯吡咯烷酮质量分数的增加,分离膜的通孔电阻下降,孔径增大,水通量增加.在孔径为10 nm^40 nm的范围内,分离膜的水通量结果与其通孔电阻之间成反比关系,该关系符合分离膜的孔洞模型.因此,电化学交流阻抗谱是一种评价分离膜的通孔结构的有效方法.An electrochemical characterization method was developed for probing the pore structure of separation membrane by electrochemical impedance spectroscopy obtained from electrochemical work station. A series of polysulfone membranes with different hole structures were prepared by altering the mass fiaction of polyvinyl pyrrolidone （PVP）. The hole structure and water flux of the membranes were evaluated by the electrochemical work station, the pore analyzer and the membrane performance tester. The results show that the resistance of the open pore decreases in separation membrane and the mean pore size and the water flux become larger when the mass fraction of PVP rises. We find an inverse relationship between the water flux and the pore resistance over the range of pore size from 10 nm to 40 nm, which can be well explained by the pore model, suggesting that the electrochemical impedance spectroscopy is an effective method for evaluating the open-pore structure of separation membrane.

关 键 词：分离膜 孔结构 电化学交流阻抗谱 水通量 

分 类 号：TB34[一般工业技术—材料科学与工程]