Here, we prepared a series of Fe-based metal organic frameworks (MOFs), including MIL-53(Fe), NH2-MIL-53(Fe), MIL-88B(Fe) and NH2-MIL-88B(Fe), via an oil bath process and used them to remove methylene blue under visible light. A comparative study of NH2-MILs and Fe-MILs was conducted. The experimental results showed that the presence of amino groups could improve the adsorption capacities of NH2-MILs, which was attributed to hydrogen bonding interactions and π–π stacking between the amino groups of the dye molecules and the amino-functionalized MOFs. The photocatalytic activities of NH2-MILs under visible light were higher than those of Fe-MILs, owing to the enhancement of visible-light absorption, the decrease in the band gap and the improvement of the adsorption capacity. After several photodegradation experiments, the catalytic activities decreased and could be restored by irradiating the catalysts with ultraviolet light. This study indicated that the amino-functionalized materials had great potential for wastewater treatment and resource utilization.Graphic abstract

中文翻译：

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亚甲蓝在铁（III）基金属-有机骨架上的同时高效吸附和光催化降解：比较研究

在这里，我们制备了一系列 Fe 基金属有机骨架 (MOF)，包括 MIL-53(Fe)、NH2-MIL-53(Fe)、MIL-88B(Fe) 和 NH2-MIL-88B(Fe)，通过油浴工艺，并用它们在可见光下去除亚​​甲蓝。对 NH2-MIL 和 Fe-MIL 进行了比较研究。实验结果表明，氨基的存在可以提高 NH2-MILs 的吸附能力，这归因于染料分子的氨基与氨基功能化 MOF 之间的氢键相互作用和 π-π 堆积。由于可见光吸收增强、带隙减小和吸附容量提高，NH2-MILs在可见光下的光催化活性高于Fe-MILs。经过多次光降解实验，催化活性降低，可以通过用紫外光照射催化剂来恢复。该研究表明氨基功能化材料在废水处理和资源化利用方面具有巨大潜力。