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Polyester Nanofiltration Membranes for Efficient Cations Separation

delete2023-12-13
delete42
PRE
AI
J
Jiapeng Li
H
Huawen Peng
K
Kuankuan Liu
Q
Qiang Zhao *
DOI：10.1002/adma.202309406delete
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Abstract

Abstract

En 中文
Polyester nanofiltration membranes highlight beneficial chlorine resistance, but their loose structures and negative charge result in poor cations retention precluding advanced use in cations separation. This work designs a new monomer (TET) containing hydroxyl-ammonium entities that confer dense structures and positive charge to polyester nanofiltration membranes. The TET monomer undergoes efficient interfacial polymerization with the trimesoyl chloride (TMC) monomer, and the resultant TET-TMC membranes feature one of the lowest molecular weight cut-offs (389 Da) and the highest zeta potential (4 mv, pH: 7) among all polyester nanofiltration membranes. The MgCl2 rejection of the TET-TMC membrane is 95.5%, significantly higher than state-of-the-art polyester nanofiltration membranes (<50%). The Li+/Mg2+ separation performance of TET-TMC membrane is on par with cutting-edge polyamide membranes, while additionally, the membrane is stable against NaClO though polyamide membranes readily degrade. Thus the TET-TMC is the first polyester nanofiltration membrane for efficient cations separation.
Keywords:
cations separation
hydroxyl-ammonium
interfacial polymerization
nanofiltration
polyester membranes

Journal

Advanced Materials cover
Advanced Materials
IF:
26.8
Papers:
3.4W
Citations:
46.0W

Organization

No organization information available