正交实验法优化制备复合荷电镶嵌膜

以聚醚砜为基膜,以聚环氧氟丙烷胺及2,5-二胺基苯磺酸混合水溶液(无机相)与三酰氯的正己烷溶液(有机相)通过界面聚合反应,制备了一种新型的复合荷电镶嵌膜.采用正交设计实验方法,研究了界面聚合条件如界面聚合单体的浓度及界面聚合反应时间对膜性能的影响.结果表明:三酰氯的浓度对膜性能的影响最为显著,其次是界面聚合时间,而聚环氧氟丙烷胺的浓度对膜性能的影响最小.优化后所制备的复合膜对盐类的截留率较低(均低于40%).膜能截留低相对分子质量有机物而透过盐,说明该膜可用于盐类与有机物的分离.

Optimization and preparation of composite charge-mosaic membrane by orthogonal design

A novel thin-film composite(TFC) charged mosaic membrane(CMM) was fabricated by using interfacial polymerization(IP) techniques to deposit a thin film composite(TFC) onto a polyethersulfone(PES) porous support membrane.The poly(epichlorohydrin-amine)(PECH-amine) and 2,5-Diamino-benzene sulphonic acid(DIA) mixture solution was chosen as aqueous phase,and trimesoyl chloride(TMC) hexane solution as organic phase.The performance of CMM was optimized by studying the preparation parameters,such as the concentration of reactive monomers and the reaction time of polymerization.The orthogonal design experiment showed that the concentration of TMC had the greatest influence on the performance of CMM,IP time was the second,and the PECH-amine and DIA concentration had the least influence.The CMM properties of the optimized TFC membrane were tested by examining various salts.The experimental results showed that under 0.4MPa operating pressure,the retentions to the charged mosaic membrane prepared under the optimal conditions were low(less than 40%).Since the CMM can be permeable to salts but meanwhile not to low-molecular-weight organics,the CMM can be used in separating low-molecular-weight organics and salts mixture solution.