Metal–organic frameworks (MOF) have attracted great attention in the field of wastewater treatment. When MOF nanoparticles are used for adsorption applications, the nanoparticles normally have to be separated from the dispersed suspension by filtration or centrifugation for regeneration or recycling. In order to avoid this costly and time consuming process, MOF (NH2-MIL-125) nanofibrous hybrid membranes with photocatalytic properties were successfully fabricated in this study. The MOF membranes were characterized by using XRD, SEM, FTIR, TGA, BET, and UV–Vis. The adsorption (including capacity, mechanism, dynamic, and isotherm) of dyes by the membranes is studied in great detail. The membranes exhibit great adsorption capacity to methylene blue and sodium fluorescein, and the adsorption is dominated by steric hindrance of dye molecule, not the π–π interactions and the zeta potential. Most importantly, the MOF membranes could be easily separated from the dyes solution and regenerated via a visible light catalytic degradation process for recycling, and the photocatalytic mechanism is discussed.

中文翻译：

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用于染料循环吸附和降解的光催化 MOF 纤维膜

金属有机框架（MOF）在废水处理领域引起了极大的关注。当 MOF 纳米粒子用于吸附应用时，纳米粒子通常必须通过过滤或离心从分散的悬浮液中分离出来以进行再生或回收。为了避免这种昂贵且耗时的过程，本研究成功制造了具有光催化性能的 MOF（NH2-MIL-125）纳米纤维混合膜。MOF 膜通过使用 XRD、SEM、FTIR、TGA、BET 和 UV-Vis 进行表征。非常详细地研究了膜对染料的吸附（包括容量、机理、动力学和等温线）。膜对亚甲蓝和荧光素钠表现出很强的吸附能力，吸附以染料分子的位阻为主，不是 π-π 相互作用和 zeta 电位。最重要的是，MOF 膜可以很容易地从染料溶液中分离出来，并通过可见光催化降解过程进行再生以进行回收，并讨论了光催化机理。