聚四氟乙烯中空纤维膜的多巴胺自聚表面改性及性能研究  

Preparation and Performance of Surface Modified PTFE Hollow Fiber Membranes by Self-Polymerization of Dopamine

作　　者：程毅丽 康国栋[1] 贾静璇[1,2] 刘健辉[1] 曹义鸣[1] 

机构地区：[1]中国科学院大连化学物理研究所洁净能源国家实验室,辽宁大连116023 [2]中国科学院大学,北京100049

出　　处：《高校化学工程学报》2015年第5期1259-1264,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：国家青年自然科学基金(21206157);国家科技支撑计划(2014BAI11B00)

摘　　要：通过多巴胺的自聚附着行为,对聚四氟乙烯(PTFE)中空纤维膜进行亲水改性。采用扫描电镜(SEM)、X射线光电子能谱(XPS)、红外光谱(FT-IR)和接触角(CA)对膜改性前后的表面形貌、化学组成和亲水性进行了表征。研究了改性条件对膜纯水通量的影响,并以牛血清蛋白(BSA)溶液为污染物考察了改性前后膜的抗污染性能。结果表明,多巴胺被成功引入PTFE膜表面,改性12 h时膜表面的F元素含量降低2.14%,O元素含量增加3.06%。膜的亲水性得到显著改善,水接触角由改性前的110°降低至改性后的80°。改性8 h时,纯水通量达原膜通量的1.5倍。改性前后膜孔径变化不大,但改性后的PTFE膜具有更好的抗污染性能,清水清洗后的通量恢复率在90%以上。Surface modification of polytetrafluoroethylene（PTFE） hollow fiber membranes was performed via self-polymerization of dopamine. Properties such as surface morphology, chemical composition and hydrophilicity of the PTFE membranes before and after modification were characterized by scanning electron microscope（SEM）, X-ray photoelectronic spectroscopy（XPS）, Fourier transform infrared spectroscopy（FT-IR） and contact angle（CA）, and the effect of modification conditions on pure water flux was investigated. Moreover, the antifouling property of the unmodified and modified membranes was also studied by using bovine serum albumin（BSA） as a model pollutant. The results indicate that dopamine can be successfully introduced onto PTFE membrane surface and the fluorine content on membrane surface decreases by 2.14% and the oxygen content increases by 3.06% after hydrophilic modification for 12 h. The hydrophilicity of PTFE is significantly improved with water contact angle decreased from 110° to 80° after modification. The water flux of the modified membrane is 1.5 times of the original ones after 8 h modification. The membrane pores are not affected after modification and the modified membranes exhibit better antifouling performance. The flux recovery rate is over 90% after water cleaning.

关 键 词：聚四氟乙烯 多巴胺 亲水 润湿性 抗污染 

分 类 号：TQ322.3[化学工程—合成树脂塑料工业]