Surface modification of polyamide reverse osmosis membrane with organic-inorganic hybrid material for antifouling
Surface modification of polyamide reverse osmosis membrane with organic-inorganic hybrid material for antifouling
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DOI：
10.1016/j.apsusc.2017.10.043
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发表时间：
2018-03
影响因子：
6.7
通讯作者：
Zhang Yang;Ying Wan;Guoyuan Pan;Y. Hao;Xuerong Yao;Hongwei Shi;Yujing Tang;Wei Xiangrong
中科院分区：
文献类型：
--
作者：
Zhang Yang;Ying Wan;Guoyuan Pan;Y. Hao;Xuerong Yao;Hongwei Shi;Yujing Tang;Wei Xiangrong
采用溶胶-凝胶法将聚乙烯醇和3-巯基丙基三乙氧基硅烷水溶液涂覆在聚酰胺复合反渗透膜表面，然后进行热交联改性。为了提高改性膜的亲水性，将膜浸泡在H_2O_2水溶液中，将−-SH转化为−-SO_3。用扫描电子显微镜、原子力显微镜、ATR-FTIR、流动电位、XPS和静态接触角对TFC膜进行了表征。有机-无机杂化材料对TFC膜进行表面改性后，随着涂布液中3-巯丙基三甲氧基硅烷含量的增加，TFC膜对氯化钠的截留率增加，水通量降低。优化的改性膜(PA-SMPTES-0.8)对氯化钠的截留率为99.29%，高于未改性PA膜的97.20%，而水通量与未改性PA膜相当(41.7%L/m~2对47.9%L/m~2)。更重要的是，PA-SMPTES-0.8膜比纯PA和PVA改性PA(PA-PVA-1.0)膜具有更好的抗BSA污染性能。BSA污染12h后，PA-SMPTES-0.8膜的初始通量损失约13%，低于纯PA和PA-PVA-1.0膜的初始通量(42%和18%)。此外，PA-SMPTES-0.8膜清洗后通量恢复率达到94%。因此，有机-无机杂化技术改性的TFC膜在海水淡化净化中具有潜在的抗污染反渗透膜的应用前景。
A series of thin-film composite reverse osmosis membranes based on polyamide have been modified by coating the polyvinyl alcohol and 3-mercaptopropyltriethoxysilane aqueous solution prepared by a sol-gel process on the membrane surface, followed by thermal crosslinking treatment. In order to improve the hydrophilicity of the modified TFC membranes, the membranes were then immersed into H2O2aqueous solution to convert −SH into −SO3H. The resulting TFC membranes were characterized by SEM, AFM, ATR-FTIR, streaming potential, XPS as well as static contact angle. After surface modification with the organic-inorganic hybrid material, the TFC membranes show increased NaCl rejection and decreased water flux with increasing 3-mercaptopropyltrimethoxysilane content in coating solution. The optimal modification membrane (PA-SMPTES-0.8) exhibits a NaCl rejection of 99.29%, higher than that (97.20%) of the virgin PA membrane, and a comparable water flux to virgin PA membrane (41.7 L/m2h vs 47.9 L/m2h). More importantly, PA-SMPTES-0.8 membrane shows much more improved fouling resistance to BSA than virgin PA and PVA modified PA (PA-PVA-1.0) membranes. PA-SMPTES-0.8 membrane loses about 13% of the initial flux after BSA fouling for 12 h, which is lower than that of virgin PA and PA-PVA-1.0 membranes (42% and 18%). Furthermore, the flux recovery of PA-SMPTES-0.8 membrane reaches 94% after cleaning. Thus the TFC membranes modified by this organic-inorganic hybrid technology show potential applications as antifouling RO membrane for desalination and purification.