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Applied surface science v.433, 2018년, pp.139 - 148   SCI SCIE
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Surface modification of polyamide reverse osmosis membrane with organic-inorganic hybrid material for antifouling

Zhang, Yang (SINOPEC Beijing Research Institute of Chemical Industry, Beijing 100013, PR China ) ; Wan, Ying (China National Pulp and Paper Research Institute, Beijing 100102, PR China ) ; Pan, Guoyuan (SINOPEC Beijing Research Institute of Chemical Industry, Beijing 100013, PR China ) ; Yan, Hao (SINOPEC Beijing Research Institute of Chemical Industry, Beijing 100013, PR China ) ; Yao, Xuerong (SINOPEC Beijing Research Institute of Chemical Industry, Beijing 100013, PR China ) ; Shi, Hongwei (SINOPEC Beijing Research Institute of Chemical Industry, Beijing 100013, PR China ) ; Tang, Yujing (SINOPEC Beijing Research Institute of Chemical Industry, Beijing 100013, PR China ) ; Wei, Xiangrong (SINOPEC Beijing Research Institute of Chemical Industry, Beijing 100013, PR China ) ; Liu, Yiqun (SINOPEC Beijing Research Institute of Chemical Industry, Beijing 100013, PR China ) ;
  • 초록  

    Abstract 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 H 2 O 2 aqueous solution to convert −SH into −SO 3 H. 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 (41.7L/m 2 h vs 47.9L/m 2 h). 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 12h, 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. Highlights PA membrane is modified with organic-inorganic material by coating method. The modified membranes show increased rejection and appropriate water flux in comparison with virgin PA membrane. The modified membranes show much more improved antifouling property than the virgin PA membrane. Graphical abstract [DISPLAY OMISSION]


  • 주제어

    Antifouling .   Coating .   Organic-inorganic hybrid .   Polyvinyl alcohol .   Reverse osmosis membrane.  

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