A subtle flower-like MIL-125-NH₂@BiOI was fabricated by a facile solvothermal method for simultaneously eliminating Cr(VI)/tetracycline mixed pollutants under visible light. The strong interaction between amino in MIL-125-NH₂ and Bi³⁺ of BiOI promotes the formation of this unique inlaid structure and enables the favorable contact between MIL-125-NH₂ and BiOI, thus accelerating the transfer of charge carriers. Remarkably, MIL-125-NH₂@BiOI displays a superior activity compared with that of two monomers for the photocatalytic reduction of Cr(VI) and degradation of tetracycline. More significantly, the photocatalytic efficiency can be further boosted in the coexistence of Cr(VI) and tetracycline, which is 1.8 and 1.6 times that of single Cr(VI) and tetracycline, respectively. The synergistic effect between Cr(VI) reduction and tetracycline oxidative degradation can further facilitate the separation of photo-induced electrons and holes, resulting in the improved efficiencies in the Cr(VI)/tetracycline coexistent environment. This work sheds light on that MOF-based photocatalysts possess huge potential for practical environmental remediation.

通过简便的溶剂热法制备了一种微妙的花朵状 MIL-125-NH ₂ @BiOI，用于在可见光下同时消除 Cr(VI)/四环素混合污染物。MIL-125-NH _{2 中的}氨基与BiOI 的Bi ³⁺之间的强相互作用促进了这种独特镶嵌结构的形成，并使MIL-125-NH ₂与BiOI之间形成良好的接触，从而加速了载流子的转移。值得注意的是，MIL-125-NH ₂与两种单体相比，@BiOI 在光催化还原 Cr(VI) 和降解四环素方面表现出优异的活性。更重要的是，Cr(VI)和四环素共存可以进一步提高光催化效率，分别是单独Cr(VI)和四环素的1.8倍和1.6倍。Cr(VI) 还原和四环素氧化降解之间的协同作用可以进一步促进光生电子和空穴的分离，从而提高 Cr(VI)/四环素共存环境的效率。这项工作揭示了基于 MOF 的光催化剂在实际环境修复方面具有巨大潜力。