中文摘要：

通过涂覆多巴胺对PVDF中空纤维膜进行亲水改性,并利用聚合多巴胺（PDOPA）的强附着性进一步进行氨基聚乙二醇（mPEG-NH2）接枝改性,实现微滤膜表面功能化.实验研究了不同反应条件下涂覆和接枝效果,并以乳化油溶液进行过滤对比分析.实验结果表明,经过480 min多巴胺涂覆改性,PVDF中空纤维膜亲水性能提高,接触角由原膜的84.9°降低为50.1°,膜表面水滴渗透速度加快;涂覆时间影响膜的纯水通量,30 min涂覆时间,纯水通量较原膜提高6.4％;过滤乳化油废水时,改性后的膜通量衰减速率减缓,稳定通量增加,抗污染性能提高.在PDOPA涂覆改性膜基础上进行mPEG-NH2接枝后,亲水性进一步提高,乳化油去除率提高13％.通过多巴胺涂覆与mPEG-NH2接枝,均有效提高了PVDF中空纤维膜在处理乳化油方面的性能.

英文摘要：

Polydopamine （PDOPA） deposition was used in this study to improve the surface hydrophilicity of the PVDF hollow-fiber membrane.In further,mPEG-NH2 was grafted on the PDOPA layer through the adhesion of PDOPA to functionalize the membrane surface.The effects of PDOPA deposition and PEG grafting were compared under various reaction condition,and the separation efficiency of oil/water emulsion was used to evaluate the performance of modified membranes.The results showed that the PDOPA modified PVDF hollow-fiber membrane increased in hydrophilicity after 480 minutes of dopamine deposition,the contact angle reduced from 84.9° to 50.1°,and the water penetration rate into membrane increased.Deposition time of PDOPA affected the pure water flux,with flux increasing 6.4％ after 30 minutes of deposition.A lower decreasing rate of flux,a higher steady-state flux and a more excellent anti-fouling were observed for modified membranes during filtration of an oil/water emulsion.The PDOPA modified membranes got a further improvement in hydrophilicity after grafting mPEG-NH2,and the rejection of oil/water emulsion increased 13％.The results show that both the PDOPA modification and mPEG-NH2 grafting improve the PVDF hollow-fiber membrane performance in the treatment of oil/ water filtration effectively.