Fouling- and Chlorine-Resistant Nanofiltration Membranes Fabricated from Charged Zwitterionic Amphiphilic Copolymers AITranslate

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DOI：https://doi.org/10.1021/acsapm.1c01940

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New polymer chemistries are urgently needed to develop nanofiltration (NF) membranes with improved fouling and chlorine resistance. This work introduces charged zwitterionic amphiphilic copolymers (CZACs), self-assembling terpolymers that spontaneously form a network of ∼1–2 nm hydrophilic nanochannels composed of zwitterionic and acidic/ ionizable building blocks. We leverage CZAC self-assembly to develop membrane filters with anionic nanopores, thereby enabling enhanced salt rejection through Donnan exclusion (R(Na2SO4) = 93.6% at 5 mM). The CZAC membranes demonstrate hydraulic permeability comparable to commercial nanofiltration membranes (0.86 – 2.3 L μm m–2 h–1 bar–1), exceptional fouling resistance, and a high level of chlorine tolerance (32 000 ppm·h), addressing key performance limitations of current NF membranes.