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<p>The high activity and easy recyclability of catalysts are significant challenges in the photocatalytic treatment of wastewater. Combining photocatalytic technology with membrane separation technology to prepare self-cleaning catalytic composite membranes for treating wastewater containing organic pollutants can not only solve the problem of traditional catalyst recovery difficulties but also overcome membrane fouling. In this paper, NH<sub>2</sub>-MIL-88B was modified by introducing citric acid as a ligand construction defect, and NH<sub>2</sub>-MIL-88B-CA (NMB-CA) with better photocatalytic performance was obtained. Then, a thin film nanocomposite (TFN) film with better self-cleaning performance was prepared by covalently bonding the NMB-CA nanocatellite to the active polyamide layer through interfacial polymerization and amidination in Polysulfone (PSF) based membrane. The best-performing TFN-2 membrane has even better fouling resistance, removing 98.1% of tetracycline after 8 cycles, and the water flux of the membrane can still recover to 99% of the initial water flux, demonstrating excellent recyclability. TFN membrane prepared in this paper has unique self-cleaning and anti-pollution characteristics, which provides a new solution for efficient treatment of organic-contaminated water.</p>

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Defect-Modified NH2-MIL-88B Improves Catalytic Self-Cleaning Properties of Thin Film Nanocomposite (TFN) Membranes

  • 期刊论文

  • 发表日期：

    2025年12月23日

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  • Jiacheng Song,
  • Ziyang Zhang,
  • Shengye Dong,
  • Anxiang Chen,
  • Shouwu Yu,
  • Shujuan Xiao

摘要

The high activity and easy recyclability of catalysts are significant challenges in the photocatalytic treatment of wastewater. Combining photocatalytic technology with membrane separation technology to prepare self-cleaning catalytic composite membranes for treating wastewater containing organic pollutants can not only solve the problem of traditional catalyst recovery difficulties but also overcome membrane fouling. In this paper, NH2-MIL-88B was modified by introducing citric acid as a ligand construction defect, and NH2-MIL-88B-CA (NMB-CA) with better photocatalytic performance was obtained. Then, a thin film nanocomposite (TFN) film with better self-cleaning performance was prepared by covalently bonding the NMB-CA nanocatellite to the active polyamide layer through interfacial polymerization and amidination in Polysulfone (PSF) based membrane. The best-performing TFN-2 membrane has even better fouling resistance, removing 98.1% of tetracycline after 8 cycles, and the water flux of the membrane can still recover to 99% of the initial water flux, demonstrating excellent recyclability. TFN membrane prepared in this paper has unique self-cleaning and anti-pollution characteristics, which provides a new solution for efficient treatment of organic-contaminated water.