PSS、PSS-co-MA/PAH动态自组装制备荷正电纳滤膜  

A positively charged nanofiltration membrane prepared by dynamic self-assembly of PSS,PSS-co-MA and PAH

作　　者：邓慧宇[1] 朱宝库[1] 魏秀珍 徐又一[1] 

机构地区：[1]浙江大学高分子科学研究所

出　　处：《功能材料》2008年第8期1313-1317,共5页Journal of Functional Materials

基　　金：国家重大基础研究发展计划(973计划)资助项目(2003CB615705)

摘　　要：以碱改性聚丙烯腈超滤膜为基膜,聚苯乙烯磺酸钠(PSS),聚苯乙烯磺酸钠-马来酸共聚物(PSS- co-MA),聚烯丙胺盐酸盐(PAH)为原料,采用动态自组装法制备了一种低压高通量荷正电纳滤膜。结果表明,动态自组装能极大地提高组装效率,效果优于静态自组装。组装双层数为2.5的纳滤膜在操作压力为0.2MPa时,对MgCl_2的脱除率为90.41%,通量为23.80L/(m^2·h),当操作压力增加到0.8MPa后,通量增大到83.76L/(m^2·h),对MgCl_2的脱除率为91.04%,通量远大于目前商品化产品。所有纳滤膜以聚烯丙胺盐酸盐为最外层,呈现明显的荷正电特征,对高价阳离子盐的脱除率大于对低价阳离子盐的脱除率。改变组装层数、最外层聚烯丙胺盐酸盐浓度可以方便地调节纳滤膜的性能,所得产品在常规纳滤用盐浓度中使用时性能稳定。A positively charged nanofiltration membrane with high flux at low operating pressure was prepared by dynamic self-assembly of poly （styrenesulfonic acid sodium salt） （PSS）, poly （4-styrenesulfonic acid-co-maleic acid） sodium salt （PSS-co-MA） and poly （allylamine hydrochloride） （PAH） on the modified poly-acrylonitrile ultra-filtration membrane. The results indicated that the performance of the NF membranes prepared by dynamic self-assembly process were superior to those prepared by the static self-assembly process. The [PAH/ PSS]1PAH/PSS-co-MA/PAH NF membrane with 2.5 bilayers showed a 90.41% rejection of MgCl2 and a permeate flux of 23.80L/（m^2 · h） at 0.2MPa,a 91.04% rejection of MgCl2 and a permeate flux of 83.76L/（m^2 · h） at 0.8 MPa. The permeate flux was higher than that of the NF membranes in market. The results also showed that the NF membranes capped with PAH were positively charged membranes which showed higher rejection for higher-valence cations than low-valence cations. The performance of NF membranes varied with the bilayer number and capping PAH concentration etc.

关 键 词：PSS PSS-co-MA PAH 动态自组装 荷正电纳滤膜 

分 类 号：TQ174[化学工程—陶瓷工业]