Enhancing polysulfone membranes with UiO-66-NH2@TiO2 for humic acid removal in a PMR under visible light

IF 10.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

npj Clean Water Pub Date : 2025-07-22 DOI:10.1038/s41545-025-00498-8

Saeed Shirazian, Hashem O. Alsaab, Masoud Habibi Zare, Qingxia Yang

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Abstract

In this study, the composite photocatalyst UiO-66-NH₂@TiO₂ and a polysulfone membrane modified with it were evaluated for removing humic acid (HA) under visible light in a photocatalytic membrane reactor (PMR). The photocatalyst and membrane were analyzed using FTIR, XRD, FESEM, PL, DRS, AFM, BET, contact angle, and porosity tests to assess pollutant removal, water flux, and membrane resistance. Synthesis was confirmed by FTIR and XRD, while DRS showed a 2.87 eV bandgap, indicating visible light activity. PL results revealed reduced electron-hole recombination. FTIR and SEM confirmed photocatalyst presence and uniform dispersion in the membrane, improving hydrophilicity by decreasing the contact angle by 8°. In suspension, the photocatalyst removed 93% of HA under visible light. Among modified membranes, PS-UNT6% performed best, showing a 26% increase in pure water flux and 12% higher HA removal (total 95.2%) compared to the unmodified membrane. Fouling was significantly reduced, with only a 14% flux drop after 12 h under light, versus 19% without modification. Pore-blocking resistance decreased by over 98%, along with reductions in intrinsic, fouling, and cake resistances, demonstrating enhanced membrane performance through photocatalytic modification.

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用UiO-66-NH2@TiO2增强聚砜膜在可见光下对PMR中腐植酸的去除

在光催化膜反应器（PMR）中，研究了uio -66- nh2 @TiO 2复合光催化剂及其改性聚砜膜在可见光下对腐植酸（HA）的去除效果。采用FTIR、XRD、FESEM、PL、DRS、AFM、BET、接触角和孔隙率测试对光催化剂和膜进行了分析，以评估污染物去除、水通量和膜阻力。通过FTIR和XRD证实了合成，DRS的带隙为2.87 eV，表明其具有可见光活性。PL结果显示电子-空穴复合减少。FTIR和SEM证实了光催化剂在膜上的存在和均匀分散，通过减少8°的接触角来提高亲水性。在悬浮液中，光催化剂在可见光下去除93%的HA。在改性膜中，PS-UNT6%表现最好，与未改性膜相比，纯水通量增加26%，HA去除率提高12%（总计95.2%）。污染明显减少，光照12小时后通量仅下降14%，而未经改性的通量下降19%。孔阻塞阻力降低了98%以上，同时降低了固有阻力、污垢阻力和饼阻力，表明通过光催化改性增强了膜的性能。

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来源期刊

npj Clean Water Environmental Science-Water Science and Technology

CiteScore

15.30

自引率

2.60%

发文量

审稿时长

5 weeks

期刊介绍： npj Clean Water publishes high-quality papers that report cutting-edge science, technology, applications, policies, and societal issues contributing to a more sustainable supply of clean water. The journal's publications may also support and accelerate the achievement of Sustainable Development Goal 6, which focuses on clean water and sanitation.