Ionic and pH responsive thin film composite hollow fiber nanofiltration membrane for molecular separation
writer：Kai Zhang, Kang Yang, Yingbo Chen*, Yunxia Hu
keywords：Thin film compositeNanofiltrationInterfacial polymerizationMolecular separationResponsive membrane
source：期刊
specific source：Desalination Volume 496, 15 December 2020, 114709
Issue time：2020年
AbstractIonic and pH responsive thin film composite (TFC) membrane is prepared by interfacial polymerization of lysine and trimesoyl chloride on the out surface of poly (m-phenylene isophthalamide) hollow fiber membrane. Hydrophilicity and strong negative charge of the TFC membrane are obtained by introducing a large amount of carboxylic groups in the cross-linked polyamide network, endorsing the ionic and pH response of the TFC membrane in terms of flux and rejection. The TFC membrane shows almost 100% rejection for Eriochrome black T, with a flux of 35.8 L/m2h (0.2 MPa) at low pH and salt concentration. However, the rejection decreases to 95.8%, and the flux increases more than three times at high pH and salt concentration due to the shift of the interaction in the polyamide network from hydrogen bonding to static-electric repulsion. The responsive TFC membrane also shows great performance in separation of dye-salt mixture and dye mixture.
Highlights
?An ionic and pH responsive TFC membrane is fabricated by IP of lysine and TMC on the PMIA hollow fiber support
?The TFC membrane shows ionic and pH responsiveness based on the shift between hydrogen bonding and static electric repulsion
?The responsive groups of the carboxyl is chemically bonded in the polyamide crosslinked layer
