PES/ZnO@rGO共混超滤膜的制备及其性能

Preparation and performance of PES/ZnO@rGO blend ultrafiltration membranes

采用溶剂热法合成了ZnO为颗粒状形貌的ZnO@rGO复合材料.以N,N-二甲基乙酰胺(DMAc)及N-甲基吡咯烷酮(NMP)为溶剂,聚乙二醇(PEG4000)为致孔剂,采用非溶剂致相分离法(NIPS)制备了聚醚砜(PES)/ZnO@rGO共混超滤膜,研究了ZnO@rGO复合材料的含量对PES共混膜结构与性能的影响.结果表明:PES/ZnO@rGO共混膜的水接触角从纯PES膜的83.7°下降到66.2°,纯水通量达到198.12 L/(m^(2)·h),是纯PES膜纯水通量的4倍,对牛血清蛋白(BSA)的截留率保持在96%以上,通量恢复率从69%增加到88%,抗污染性能较纯PES膜明显提高.共混膜对甲基蓝(MB)的光催化降解效率从68%提高到93%,显示出优异的光催化降解能力.

In this work, ZnO@rGO composites were synthesized by solvothermal method, in which ZnO was granular morphology. Using N,N-dimethylacetamide(DMAc) and 1-methy1-2-pyrrolidinone(NMP) as solvents, polyethylene glycol(PEG4000) as pore-forming agent, the polythersulfone(PES)/ZnO@rGO blend membranes were prepared by non-solvent phase separation(NIPS) method. The effect of the addition contents of ZnO@rGO on the structure and performance of PES blend membranes was investigated. The results showed that the water contact angles could change from 83.7° of the PES/ZnO@rGO blend membranes to 66.2° of the pure PES membrane to, and the pure water flux of the blend membranes could achieve 198.12 L/(m^(2)·h), which is 4 times larger than that of the pure PES membrane. In addition, the BSA rejection of PES/ZnO@rGO blend membranes is above 96% and the flux recovery rate increased from 69% to 88%, and the anti-fouling performance of the blend membranes could be improved significantly. Furthermore, the photocatalytic activity of PES/ZnO@rGO blend membranes for MB increased from 68% to 93%, showing excellent photocatalytic ability.