酚酞型聚醚砜对聚偏氟乙烯中空纤维膜结构及性能的影响

以二苯甲酮和N,N-二甲基乙酰胺为稀释剂,酚酞型聚醚砜(PES-C)为添加剂,通过热致相分离法制备了聚偏氟乙烯(PVDF)中空纤维膜。采用扫描电镜观察了膜的结构,测试了膜的纯水通量。在膜生物反应器(MBR)中测试了膜的污水通量和出水的化学需氧量及氨氮指标。该法制得的膜具有较为致密的皮层结构和疏松的支撑层结构,添加质量分数为2%的PES-C制备的PVDF膜与PVDF膜相比纯水通量增加60%,污水通量增加37.8%,出水COD去除率增加了3.32%,NH4+—N去除率增加了2.2%,且MBR出水达到排放标准。

Effect of PES-C on structure and property of PVDF hollow fiber membrane

Polyvinylidene fluoride (PVDF) hollow fiber membranes were prepared via thermally induced phase separation (TIPS) method by using diphenyl ketone (DPK)-N, N-dimethyl acetamide (DMAc) as diluent and phenolphthalein polyethersulfone (PES-C) as additive. The structure of membrane was observed through SEM and pure water flux, sewage flux, COD and NH4+-N content of MBR effluent were also investigated. A thinner skin layer and porous support layer were formed when 2% PES-C was added into casting solution. Compared with PVDF membrane, the pure water flux of membrane prepared with 2% PES-C addition increased by 60 percent and the sewage flux increased by 37.8 percent, well COD removal ratio of the effluent increased by 3.32 percent and NH4+-N removal ratio increased by 2.2 percent and also the effluent of the membrane came up the discharge standard.