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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.
Electrochemical impedance spectroscopy (EIS) was used to establish an electrochemical characterization technique to measure the pore structure of the separation membrane.Polysulfone separation membranes with different pore structures were prepared by changing the mass fraction of polyvinylpyrrolidone.Using electrochemical workstation, Pore volume analyzer and membrane performance test device were used to analyze the pore structure and water flux of the separation membrane.The results showed that with the increase of polyvinylpyrrolidone mass fraction, the via resistance of the separation membrane decreased, the pore diameter increased, In the range of 10 nm to 40 nm, the water flux of the separation membrane is inversely proportional to the via resistance of the separation membrane, which is consistent with the pore model of the separation membrane.Therefore, the electrochemical impedance spectroscopy is a An effective method of evaluating the via structure of a separation membrane.