荷正电纳滤膜的制备研究

Study on the Preparation of Positively Charged Nanofiltration Membrane

主要研究以聚乙烯亚胺(PEI)和均苯三甲酰氯(TMC)为反应单体,采用界面聚合法来制备荷正电纳滤膜。通过均匀实验设计,得出的优化条件为:PEI浓度为1.75%,十二烷基硫酸钠(SDS)浓度为0.1%,酸接受剂(Na2CO3∶NaOH=2∶1)浓度为0.3%(均为质量浓度),界面聚合反应时间(IPT)为2 m in,膜对一价盐的截留率均在30%左右,对二价盐的截留率接近70%,对低分子有机染料的截留率达90%以上。

A positively charged nanofihration （NF） membrane is prepared by interfacial polymerization method, with polyethylenimine（PEI） and trimesoyl chloride （ TMC ） as reaction monomers. From uniform experimentaldesign, the optimization condition is obtained that the feasible concentration of PEI is 1.75 % （ wt ） ; theconcentrationofSDSis0. 1% （ wt ） ; the concentration of acid accepters （ Na ） is0.3 % （wt） and reaction time is 2 min. The retention of this membrane to CaC12 and MgC12 is about 70% and the retention to NaC1 and KC1 is about 30%. Moreover, the retention of this membrane to dyes with small molecule weight is more than 90%.