摘要
为解决含油废水处理难题,以聚四氟乙烯-全氟丙基乙烯基醚(PFA)为成膜聚合物,聚乙烯醇(PVA)为粘接剂,采用浸渍-烧结法制备了聚间苯二甲酰间苯二胺(PMIA)编织管增强型(PBR)中空纤维膜,通过改变烧结温度及石墨烯(GE)含量对膜表面结构进行调控,并采用扫描电子显微镜(SEM)、热重分析(TG)、傅里叶红外分析(FTIR)、孔径分析及油水分离试验等考察其对膜结构及油水分离性能影响.结果表明,随烧结温度升高,油通量减小;随GE含量增加,膜的水接触角、表面粗糙度及孔隙率减小,油通量先增大后减小,油水分离效率逐渐增大;PBR-PFA/GE中空纤维膜可用于油水分离过程,在−0.02 MPa时,对不同油品分离效率均高于97%,且对油包水乳液具有一定的破乳化能力,循环使用后,通量恢复率保持较好.
In order to solve the problem of oily wastewater,the poly(m-phenyleneisophthalamide)(PMIA)braided tube reinforced(PBR)poly(tetrafluoroethylene-co-perfluoropropyl vinyl ether)(PFA)hollow fiber membrane was prepared via dipping-sintering method with the PFA and poly(vinyl alcohol)(PVA)as membraneforming polymer and bonding agent,respectively.The membrane surface structure was adjusted by changing the sintering temperature and graphene(GE)content,and the influence of membrane structure and oil-water separation performance were investigated by scanning electron microscopy(SEM),thermogravimetric(TG),Fourier transform infrared(FTIR),pore size analysis and oil-water separation experiment.The morphology observation shows that the surface PFA melts and permeates into the PMIA braided tube after sintering,and separation layer is closely combined with the support layer.The experiment results also indicate that with sintering temperature increasing,the oil flux decreases.On the other hand,with GE content increasing,the water contact angle,roughness,and porosity of PBR-PFA/GE hollow fiber membrane decrease,however,the oil flux increases initially and then decreases,the oil-water separation efficiency increases gradually.Furthermore,the introduction of GE not only has a similar effect on the increase of sintering temperature,but also results in two different ways of pore formation on the membrane surface.The PBR-PFA/GE hollow fiber membrane exhibits excellent hydrophobicity and lipophilicity with more than 97%separation efficiency for different oil products at−0.02 MPa.In addition,the membrane shows higher separation ability to the water-in-oil emulsion,and maintains a fine flux recovery rate after recycling,making it possible to apply in the field of wastewater treatment.
作者
舒溪
肖长发
陈凯凯
张泰
凌浩洋
Xi Shu;Chang-fa Xiao;Kai-kai Chen;Tai Zhang;Hao-yang Ling(State Key Laboratory of Separation Membranes and Membrane Processes,School of Textile Science and Engineering,Tianjin Polytechnic University,Tianjin 300387)
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2020年第12期1356-1366,I0003,共12页
Acta Polymerica Sinica
基金
国家自然科学基金(基金号51673149)资助项目.
关键词
聚四氟乙烯-全氟丙基乙烯基醚
石墨烯
增强型
中空纤维膜
油水分离
Poly(tetrafluoroethylene-co-perfluoropropyl vinyl ether)
Graphene
Reinforced
Hollow fiber membrane
Oil-water separation
