【摘要】 膜污染是目前影响膜技术发展的制约因素之一。为提高聚偏氟乙烯（PVDF）超滤膜的亲水性和抗污染性,以PVDF为膜材料,聚乙二醇（PEG 6000）为添加剂,采用相转化法制备PVDF平板膜;以没食子酸（GA）和聚乙烯亚胺（PEI）的交联网状结构为功能化平台,利用真空辅助抽滤法将Ti₃C₂T_x MXene沉积到膜上,进而达到对PVDF膜改性的目的。接触角测试结果表明,GA涂层与Ti₃C₂T_x MXene沉积层的加入使PVDF膜的水接触角从92°减小为30°,膜的亲水性明显提高;膜与牛血清蛋白（BSA）间的黏附力从267.5 pN降低至23.5 pN,通量恢复率高达98.78%,表明改性后,膜的抗污染能力明显增强。更多还原

【Abstract】 The issue of membrane fouling had drawn great attention in the research of water purification. In this study, PVDF membrane was selected as modified anti-fouling the substrate material. The coating had more robust adhesion due to its cross-linking network structure. Inspired by this thought, we added polyethyleneimine（PEI） molecules to the GA coating. Subsequently, Ti₃C₂T_x MXene nanosheets were fixed on the coating modified polymer membrane surface via the adhesive ability of GA/PEI and vacuum assisted filtration. The results showed that due to the introduction of GA and Ti₃C₂T_x MXene, the water contact angle of PVDF membrane decreased from 92° to 30° and the adhesion（between membrane and BSA） decreased from 267.5 pN to 23.5 pN, and the flux recovery rate was as high as 98.78%. The anti-fouling ability of PVDF membrane was significantly enhanced.更多还原