Highly efficient bimetallic heterogeneous photo-Fenton catalysts (Fe₂O₃/CuO@MCM-41, FCM and MnO_x/CuO@MCM-41, MCM) have been successfully prepared via wet impregnation over a mesoporous MCM-41 silica support. FESEM images demonstrate that the metal oxides are highly dispersed on the surface of the MCM-41 matrix consisting of the ordered 2D hexagonal mesostructure. XPS results indicate that the bimetallic oxides species in FCM and MCM are Fe₂O₃, CuO and MnO_x, CuO, respectively. The as-prepared dual-heterojunctions have a significant enhancement of catalytic activities under visible light, compared with the material containing monometal, and prevents the leaching of metal ions species. The degradation efficiencies of MB can be up to 99.65% and 98.22% within 45 min irradiation for FCM_1:2 and MCM_1:0.5, respectively. And the degradation efficiencies still can reach up to 92% after 10 cycles. Moreover, the synthesized bimetallic dual-heterojunctions catalysts can be employed in very mild condition, and little difference in catalytic effect was observed under different pH value (3.0–9.0). The improved photocatalytic activity can be ascribed to the sufficient interfacial contact between different components for photo energy transfer and e⁻/h⁺ pairs separation, which greatly enhance cycle reaction of Fe³⁺/Fe²⁺ or Mn⁴⁺/Mn³⁺/Mn²⁺ after introducing CuO. This research provides a new approach for the development of an effective heterogeneous photo-induced Fenton (Fenton like) catalyst with vast potential for organic pollutant removal.

中文翻译：

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MCM-41负载的Fe（Mn）/ Cu双金属多相催化增强亚甲基蓝的可回收Fenton降解

通过介孔MCM-41二氧化硅载体上的湿法浸渍，已经成功制备了高效的双金属多相光芬顿催化剂（Fe ₂ O ₃ / CuO @ MCM-41，FCM和MnO _x / CuO @ MCM-41，MCM）。FESEM图像表明，金属氧化物高度分散在由有序2D六角形介观结构组成的MCM-41基质表面上。XPS结果表明，FCM和MCM中的双金属氧化物种类为Fe ₂ O ₃，CuO和MnO _x。，CuO分别。与含有单金属的材料相比，所制备的双异质结在可见光下具有显着增强的催化活性，并防止了金属离子种类的浸出。对于FCM _1：2和MCM _1：0.5，MB的降解效率在45分钟内分别可达到99.65％和98.22％。10个循环后，降解效率仍可达到92％。此外，合成的双金属双异质结催化剂可在非常温和的条件下使用，并且在不同的pH值（3.0-9.0）下观察到的催化效果差异很小。改善的光催化活性可以归因于不同组分之间的足够的界面接触，以进行光能传递和ë ^- / H ⁺对分离，这大大提高的Fe循环反应³⁺ / Fe的²⁺或Mn ⁴⁺ / Mn为³⁺ / Mn为²⁺引入的CuO后。这项研究为开发一种有效的非均质光诱导Fenton（Fenton like）催化剂提供了一种新方法，该催化剂具有去除有机污染物的巨大潜力。