氟化PDMS/PVDF双疏膜的制备及其在膜蒸馏中的应用  

Fabrication of fluorinated PDMS/PVDF amphiphobic membrane and its application in membrane distillation

作　　者：张学励 李保安 ZHANG Xueli;LI Baoan(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China;Collaborative Innovation Center of Chemical Science and Engineering(Tianjin),Tianjin 300072,China;State Key Laboratory of Chemical Engineering(Tianjin University),Tianjin 300072,China;Tianjin Key Laboratory of Membrane Science and Desalination Technology,Tianjin 300350,China;College of Enviromental Science and Engineering,Nankai University,Tianjin 300350,China)

机构地区：[1]天津大学化工学院,天津300350 [2]天津化学化工协同创新中心,天津300072 [3]化学工程联合国家重点实验室(天津大学),天津300072 [4]天津市膜科学与海水淡化重点实验室,天津300350 [5]南开大学环境科学与工程学院,天津300350

出　　处：《膜科学与技术》2021年第1期102-111,共10页Membrane Science and Technology

基　　金：国家自然科学基金项目(21878218)。

摘　　要：膜蒸馏(MD)是一种能够利用低品位能源的新型脱盐技术,但迄今为止仍然没达到规模化应用的阶段,其主要原因是缺乏具有抗污染性的膜材料.通过表面改性提高膜的超疏水性是解决膜污染问题的有效方法.采用浸涂法,以聚二甲基硅氧烷(PDMS)、正硅酸乙酯(TEOS)和二月桂酸二丁基锡(DBTDL)等为原料活化PVDF膜表面,然后接枝1H,1H,2H,2H-全氟癸基三乙氧基硅烷(AC-FAS)制备双疏膜.其水、油接触角分别达161.3°和134.9°,并且具有良好的热稳定性和化学稳定性.在直接接触式膜蒸馏(DCMD)实验中,具有较高的膜通量、良好的脱盐性能以及优异的抗综合膜污染的能力.Membrane distillation(MD),as a new desalting technology,can utilize low grade energy.However,large-scale application based on membrane distillation has not been widely used.One of the important reasons is the lack of membrane with good anti-fouling property.Therefore,it is of critical importance to prepare amphiphobic membrane to improve the anti-fouling property.A functional layer was formed on the PVDF membrane surface by using polydimethylsiloxane(PDMS),tetraethoxysilane(TEOS)and dibutyltin dilaurate(DBTDL).Next,the surface was fluorinated with 1H,1H,2H,2Hperfluorodecyltriethoxysilane to obtain amphiphobic membrane.The contact angles of water and oil reached 161.3°and 134.9°respectively,showing obvious superhydrophobic and oleophobic properties.In addition,the amphiphobic membrane still shares good stability under harsh conditions.The long-term direct contact membrane distillation(DCMD)experiment shows outstanding comprehensive anti-fouling capacity with higher flux and excellent salt rejection.

关 键 词：聚二甲基硅氧烷 氟硅烷 双疏 膜蒸馏 抗污染 

分 类 号：TQ028.8[化学工程]