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<p>Polyvinylidene fluoride (PVDF) hollow fiber membranes are favored for their mechanical robustness and chemical stability. However, challenges remain due to low fluxes and various fouling issues. This project introduces two types of PVDF functionalization: the grafting of sulfobetaine methacrylate (SBMA) via atom transfer radical polymerization and the in situ formation of silver nanoparticles (AgNPs) on SBMA or graphene oxide (GO) coating. These modifications were confirmed by SEM and FTIR characterizations. Results showed that the PSBMA-AgNPs membrane exhibited improved hydrophilicity, with a contact angle reduction from 77.18° to 68.19°, and an increase in pure water flux from 33.4 to 78.6 L·m<sup>-2</sup>·h<sup>-1</sup>. Meanwhile, the PSBMA-GO membrane achieved an even lower contact angle of 44.98° and enhanced bovine serum albumin (BSA) rejection at 91.7%. Both modified membranes demonstrated a reduced flux decay rate and a lower viable bacteria count. Additionally, confocal laser scanning microscopy results indicated their exceptional antibacterial properties, highlighting their potential applicability in water treatment processes.</p>

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Enhancement of water permeability and antifouling attributes in PVDF membranes via zwitterionic polymer brush and nanomaterial surface modification

  • 期刊论文

  • 发表日期：

    2025年11月12日

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  • Shuli Liu,
  • Yatong Gao,
  • Yuhong Zhang,
  • Xiaohong Han,
  • Heng Li,
  • Glen T. Daigger,
  • Qi Li,
  • Ning Guo,
  • Jia Kang,
  • Yanqing Liu,
  • Gangfu Song

摘要

Polyvinylidene fluoride (PVDF) hollow fiber membranes are favored for their mechanical robustness and chemical stability. However, challenges remain due to low fluxes and various fouling issues. This project introduces two types of PVDF functionalization: the grafting of sulfobetaine methacrylate (SBMA) via atom transfer radical polymerization and the in situ formation of silver nanoparticles (AgNPs) on SBMA or graphene oxide (GO) coating. These modifications were confirmed by SEM and FTIR characterizations. Results showed that the PSBMA-AgNPs membrane exhibited improved hydrophilicity, with a contact angle reduction from 77.18° to 68.19°, and an increase in pure water flux from 33.4 to 78.6 L·m-2·h-1. Meanwhile, the PSBMA-GO membrane achieved an even lower contact angle of 44.98° and enhanced bovine serum albumin (BSA) rejection at 91.7%. Both modified membranes demonstrated a reduced flux decay rate and a lower viable bacteria count. Additionally, confocal laser scanning microscopy results indicated their exceptional antibacterial properties, highlighting their potential applicability in water treatment processes.