Zwitterionic polymer modification of polyamide reverse-osmosis membranes via surface amination and atom transfer radical polymerization for anti-biofouling

Surface-initiated atom transfer radical polymerization (SI-ATRP) is a powerful method to uniformly modify the surface of reverse-osmosis (RO) membranes with functional polymers and prevent biofouling. However, immobilization of the initiator, an essential step of SI-ATRP, is difficult to perform dir...

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Vydáno v:Journal of membrane science Ročník 550; s. 332 - 339
Hlavní autoři: Yang, Zhe, Saeki, Daisuke, Matsuyama, Hideto
Médium: Journal Article
Jazyk:angličtina
Vydáno: Elsevier B.V 15.03.2018
Témata:
amination
Anti-biofouling
artificial membranes
bacterial adhesion
biofilm
biofouling
filtration
hydrophilicity
organobromine compounds
permeability
polyamides
polymerization
Reverse-osmosis membrane
Surface amination
Surface-initiated atom transfer radical polymerization
Zwitterionic polymer
zwitterions
Zwitterionic polymer
Surface amination
Anti-biofouling
Surface-initiated atom transfer radical polymerization
Reverse-osmosis membrane
ISSN:0376-7388, 1873-3123
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Shrnutí:Surface-initiated atom transfer radical polymerization (SI-ATRP) is a powerful method to uniformly modify the surface of reverse-osmosis (RO) membranes with functional polymers and prevent biofouling. However, immobilization of the initiator, an essential step of SI-ATRP, is difficult to perform directly on commercial polyamide RO membranes. This study describes an effective pretreatment method to immobilize ATRP initiators on the surface of polyamide RO membranes and the effect of the polymer chain length on the biofouling behavior. Firstly, RO membrane surfaces were aminated with 3-aminopropyltrimethoxysilane (APTES). Then, α-bromoisobutyryl bromide (BIBB), an acyl halide-type ATRP initiator, was reacted with the APTES layer. A zwitterionic polymer, poly[(2-methacryloyloxy)ethyl]dimethyl[3-sulfopropyl]ammonium hydroxide (pMEDSAH), was then grafted on the membrane surface via SI-ATRP. The APTES treatment effectively improved the amount of BIBB immobilized on the membrane surface, maintaining the water permeability and salt rejection properties of the RO membrane. pMEDSAH grafting enhanced the surface hydrophilicity and changed the surface to a smoother and denser morphology. Regarding the biofouling behavior, static bacterial adhesion on the membrane surface was prevented by increasing the ATRP polymerization time. In cross-flow bacterial filtration tests, the membranes grafted with pMEDSAH at polymerization times of over 1h presented no permeability decline and little biofilm coverage. •ATRP initiators were immobilized on polyamide RO membranes through aminosilane.•Zwitterionic polymer was grafted by surface-initiated ATRP.•Fabricated membranes showed excellent anti-biofouling property retaining water flux.•Longer chain length of zwitterionic polymer was more effective to prevent biofouling.
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ISSN:0376-7388
1873-3123
DOI:10.1016/j.memsci.2018.01.001