This study fabricated a CoFe layered double hydroxide (CoFeLDH) membrane incorporating the metal–organic framework (MOF) MIL(100)Fe, tailored for a peroxymonosulfate (PMS) based system. Among various combinations of MOF and LDH nanosheets on a PVDF substrate, the highest water flux, reaching 1900 L/m/hr/bar, was achieved with an LDH/MOF ratio of 5:1 and an MOF concentration of 0.025 M. The optimized membrane exhibited exceptional performance, achieving 99 % degradation of ranitidine at 0.1 mM PMS. The LDH MOF catalytic membrane exhibited excellent treatment performance in real water matrices and demonstrated long-term operational efficiency. The effective removal of ranitidine by this catalytic membrane was attributed to a synergistic combination of radical (SO and OH) and non-radical (singlet 1O and electron transfer O) oxidation pathways, with SO and singlet 1O playing a predominant role. Post-activation, 40 % of surface Co and 65 % of Fe in the LDH MOF membrane were found in the + III oxidation state, highlighting the significance of metal catalytic sites and the reusability potential of the membrane. The durability of the membrane was evident through 10 cycles, achieving a flux recovery ratio of 95 % in the first cycle and sustaining efficient performance across pH variations (3 to 9) and exposure to various anions. Importantly, negligible metal leaching was observed for the real water samples, ensuring suitability for large-scale applications.

中文翻译：

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高通量原子分散的 MIL-100 (Fe) 结合了基于 PMS 的 LDH 催化膜，用于去除二级废水中的微污染物


本研究制造了一种包含金属有机骨架 (MOF) MIL(100)Fe 的 CoFe 层状双氢氧化物 (CoFeLDH) 膜，专为基于过一硫酸盐 (PMS) 的系统量身定制。在 PVDF 基底上的 MOF 和 LDH 纳米片的各种组合中，LDH/MOF 比例为 5:1、MOF 浓度为 0.025 M 时，最高水通量达到 1900 L/m/hr/bar。膜表现出卓越的性能，在 0.1 mM PMS 下实现了 99% 的雷尼替丁降解。 LDH MOF催化膜在实际水基质中表现出优异的处理性能，并表现出长期运行效率。该催化膜对雷尼替丁的有效去除归因于自由基（SO和OH）和非自由基（单线态1O和电子转移O）氧化途径的协同组合，其中SO和单线态1O起主导作用。活化后，LDH MOF 膜中 40% 的表面 Co​​ 和 65% Fe 处于 + III 氧化态，突出了金属催化位点的重要性和膜的可重复使用潜力。膜的耐用性在 10 个循环中非常明显，在第一个循环中实现了 95% 的通量恢复率，并在 pH 值变化（3 至 9）和暴露于各种阴离子的情况下保持高效性能。重要的是，在真实水样中观察到的金属浸出可以忽略不计，确保了大规模应用的适用性。