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        Anti-fouling nanofiltration membranes based on macromolecule crosslinked polyvinyl alcohol

        Dujuan Hu,Yanbo Li,Zhiguo Yan,Shaoping Li,Man Xu,Cunwen Wanga 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.112 No.-

        Nanofiltration membranes with excellent anti-fouling properties were fabricated through a green surfacecrosslink method. Poly (styrene-maleic anhydride) (SMA) blended polyethersulfone (PES) membrane wasused as a support. The SMA in the PES support served as a macromolecular crosslinker. After coating ofpolyvinyl alcohol (PVA) on the surface of the SMA-PES support, a PVA selective layer with gradient crosslinkedstructure was formed, through the esterification between the anhydride groups in SMA and thehydroxyl groups in PVA. This process adopts a full-water fabrication strategy without secondary pollution. The gradiently cross-linked PVA/SMA-PES membrane, with molecular weight cut-off (MWCO) about600 Da and permeance around 10-12 L/(m2hbar), exhibited good dye/salts separation performance. Inthe filtration of a mixed solution of Congo Red (CR) and calcium chloride (CaCl2), the membrane rejected98% CR and only had 10% rejection of CaCl2. In addition, this membrane processed an excellent antifoulingproperty. In the BSA fouling test, the pure water flux recovery ratio (FRR) was 99%. It is expectedthat the PVA/SMA-PES membrane can be used in organic desalination.

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