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<p>To overcome membrane permeation selectivity defects and mitigate membrane fouling, a novel nanocomposite, UiO-66-NH<sub>2</sub>/g-C<sub>3</sub>N<sub>5</sub> (UNCN), was designed and synthesized. Notably, this composite overcomes the inherent limitations of UiO-66-NH<sub>2</sub> (limited visible light absorption) and g-C<sub>3</sub>N<sub>5</sub> (low specific surface area). The optimal composite ratio was determined to be 3:7 through systematic optimization. The UNCN-3:7 nanocomposite was then embedded into the polyamide selective layer on polysulfone via in situ interfacial polymerization under optimal conditions, resulting in a thin film nanocomposite (TFN) Nanofiltration membrane. Characterization revealed that the UNCN-3:7 Nanocomposites were uniformly distributed within the polyamide (PA) matrix. The resulting TFN Nanofiltration membrane possessed an ultrathin, positively charged selective layer with enhanced hydrophilicity, evidenced by a reduction in water contact angle from 60.3° to 47.3°. It exhibited a 43% increase in pure water permeability compared to the unmodified thin film composite (TFC) membrane (52.7 vs. 36.9 L·m<sup>−2</sup>·h<sup>−1</sup>·bar<sup>−1</sup>), while maintaining an excellent Na<sub>2</sub>SO<sub>4</sub> retention rate (&gt; 96%). Furthermore, the membrane demonstrated excellent photocatalytic degradation performance, superior anti-fouling properties (flux recovery rate &gt; 92%), and stable long-term operation. These results indicate that the construction of the novel UNCN nanocomposite Nanofiltration membrane presents an effective strategy to address membrane fouling issues.</p>

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Controllable Preparation of Novel UiO-66-NH2/g-C3N5 Thin-Film Nanocomposite Nanofiltration Membranes with Efficient Photocatalytic Pollutant Removal and Anti-Fouling Ability

  • 期刊论文

  • 发表日期：

    2026年2月27日

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  • Jianghao Tian,
  • Min Xiao,
  • Shifeng Li,
  • Ruiying Bu,
  • Xin Yang,
  • Hongling Zhang,
  • Xiaoyang Chen

摘要

To overcome membrane permeation selectivity defects and mitigate membrane fouling, a novel nanocomposite, UiO-66-NH2/g-C3N5 (UNCN), was designed and synthesized. Notably, this composite overcomes the inherent limitations of UiO-66-NH2 (limited visible light absorption) and g-C3N5 (low specific surface area). The optimal composite ratio was determined to be 3:7 through systematic optimization. The UNCN-3:7 nanocomposite was then embedded into the polyamide selective layer on polysulfone via in situ interfacial polymerization under optimal conditions, resulting in a thin film nanocomposite (TFN) Nanofiltration membrane. Characterization revealed that the UNCN-3:7 Nanocomposites were uniformly distributed within the polyamide (PA) matrix. The resulting TFN Nanofiltration membrane possessed an ultrathin, positively charged selective layer with enhanced hydrophilicity, evidenced by a reduction in water contact angle from 60.3° to 47.3°. It exhibited a 43% increase in pure water permeability compared to the unmodified thin film composite (TFC) membrane (52.7 vs. 36.9 L·m−2·h−1·bar−1), while maintaining an excellent Na2SO4 retention rate (> 96%). Furthermore, the membrane demonstrated excellent photocatalytic degradation performance, superior anti-fouling properties (flux recovery rate > 92%), and stable long-term operation. These results indicate that the construction of the novel UNCN nanocomposite Nanofiltration membrane presents an effective strategy to address membrane fouling issues.