In this research, novel CuO-ZnO/ZiF-8 metal–organic frameworks (MOFs) photocatalyst with different mass percentages of ZiF-8 were prepared for water purification applications under visible light. The precipitation method was used to synthesize CuO-ZnO/ZiF-8 photocatalysts. Some techniques, including XRD, FESEM, EDX, BET-BJH, FTIR, DRS, and pH_pzc, were performed to determine the structural, chemical, and optical properties of the prepared samples. DRS analysis represented that CuO-ZnO/ZiF-8(20) had narrower band gap energy compared to CuO-ZnO and ZiF-8. Also, BET-BJH analysis results showed that CuO-ZnO had a low surface area that impeded the absorption of pollutant molecules. In contrast, the CuO-ZnO/ZiF-8(20) sample, due to the presence of ZiF-8, had a high specific surface area which enabled higher pollutant adsorption on the photocatalyst surface.

Moreover, the synthesized samples were evaluated for the solar-light-driven removal of different organic dyes, such as Acid Orange 7, Methylene blue, and Malachite green. The tremendously enhanced photocatalytic activity under the simulated solar light with 98.1% removal of AO7 was observed over CuO-ZnO/ZiF-8(20) sample. Then, the effect of initial solution pH as an essential factor on photocatalytic activity was investigated. Finally, the reaction mechanism of AO7 degradation over CuO-ZnO/ZiF-8(20) was proposed.

在这项研究中，制备了具有不同质量百分比的 ZiF-8 的新型 CuO-ZnO/ZiF-8 金属有机骨架 (MOF) 光催化剂，用于可见光下的水净化应用。采用沉淀法合成了CuO-ZnO/ZiF-8光催化剂。一些技术，包括 XRD、FESEM、EDX、BET-BJH、FTIR、DRS 和 pH _pzc，进行了测定制备样品的结构、化学和光学性质。DRS 分析表明，与 CuO-ZnO 和 ZiF-8 相比，CuO-ZnO/ZiF-8(20) 具有更窄的带隙能量。此外，BET-BJH 分析结果表明，CuO-ZnO 具有较低的表面积，阻碍了污染物分子的吸收。相比之下，CuO-ZnO/ZiF-8(20) 样品，由于 ZiF-8 的存在，具有高比表面积，这使得光催化剂表面能够吸附更高的污染物。

此外，还评估了合成样品在太阳光驱动下对不同有机染料（例如酸性橙 7、亚甲蓝和孔雀石绿）的去除效果。在 CuO-ZnO/ZiF-8(20) 样品上观察到在模拟太阳光下具有 98.1% 的 AO7 去除率的极大增强的光催化活性。然后，研究了初始溶液 pH 作为对光催化活性的重要因素的影响。最后，提出了 AO7 在 CuO-ZnO/ZiF-8(20) 上降解的反应机理。