中文摘要：

在聚氯乙烯（PVC）超滤膜表面通过沉积形成与之共价结合的聚乙烯亚胺（PEI）层,先后用戊二醛和2,3G环氧丙基三甲基氯化铵（EPTAC）令PEI交联和季铵化,制备了荷正电PVC/PEI复合纳滤膜;考察PEI分子量和EPTAC 浓度对膜结构及性能的影响.结果表明,当分子量分别为5万和7万的两种PEI按质量比1∶1混合使用时,可以得到皮层致密均-的复合膜,EPTAC 季铵化后PVC/PEI复合纳滤膜荷正电,有良好的亲水性,0.3 MPa操作压力下水通量达58.7L/m2·h,对NaCl不截留,对刚果红染料的截留率达98.9%,在染料和无机盐分离领域具有重要意义.

英文摘要：

By filtering deposition of polyethylene imine (PEI)and then crosslinking by glutaraldehyde,a dense separation layer was introduced onto the surface of PVC ultrafiltration membrane.On this basis,positively charged PVC/PEI composite NF membrane was prepared after the reaction between the remaining amino groups and 2,3-epoxy-trimethyl ammonium chloride(EPTAC).It was found that we would achieve PVC nanofiltration membrane with the best performance using mixture of PEI-7w and PEI-2w (1∶1 ).The PVC/PEI composite NF membrane showed good hydrophilicity and great nanofiltration performance.Under the operating pressure of 0.3 MPa,the Congo red rejection and flux is 98.9% and 58.7 L/m2 ·h,respectively,while the NaCl rejection is almost zero.Thus,the PVC nanofiltration membrane was quite qualified for the separation of mixed inorgan-icsalt and dye solution.This approach is a promising way for fabricating PVC NF membrane with high water flux and dye rej ection.