聚丙烯腈静电纺丝膜表面界面聚合制备复合纳滤膜

摘要

A novel composite nanofiltration membranes were prepared by interfacial polymerization method using polyacrylonitrile nanofibrous electrospinned scaffolds as support, piperazine (PIP) and trimesoyl chloride (TMC) as monomers. The properties of composite membranes were characterized. This research concentrated on the effect of monomer concentration. The surface chemical composition was investigated by ATR-FTIR; and the surface and cross-section microstructure was characterized by SEM. The separation properties was also tested, and the composite membrane's rejection rates of 2 000 mg/L NaCl, 2 000 mg/L Na2SO4, 10 mg/L Fast Green and 10 mg/L methyl orange were 27. 92%, 95. 13%, 93. 59% and 95. 81% respectively, under 0. 3 Mpa and 25℃. And the water flux was about 14 L/(m2·h) under 0. 3 Mpa and 25 ℃.%以聚丙烯腈静电纺丝膜为基膜,哌嗪(PIP)和均苯三甲酰氯(TMC)为单体,采用界面聚合法制备新型的复合纳滤膜,并对其性能进行了表征.实验重点研究了界面聚合中参加反应单体的浓度对界面聚合的影响.并用表面全反射红外光谱(ATR-FTIR)和扫描电镜(SEM)分别对界面聚合前后膜表面化学组成和膜表面、断面的微观结构进行了表征.最后还对复合膜的分离性能进行了测试,在0.3 MPa、25℃条件下,膜的纯水通量为14 L/(m2· h),复合膜对2 000 mg/L NaCl和Na2 SO4以及10 mg/L的固绿和甲基橙小分子的截留率分别为27.92％、95.13％、93.59％和95.81％,达到了纳滤分离级别.