National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Material Sciences, Hebei Normal University , Shijiazhuang 050024, China.
ACS Appl Mater Interfaces. 2017 Dec 6;9(48):41927-41936. doi: 10.1021/acsami.7b14799. Epub 2017 Nov 22.
A series of CuO-decorated ZnFeO samples were prepared by a hydrothermal method and investigated as a catalyst for the photocatalytic and Fenton-like degradation of Orange II. The active species and catalyst active sites in the two processes were also studied. It was found that the introduced CuO significantly enhanced the photocatalytic and Fenton-like performance of ZnFeO. Especially, ZnFeO-Cu3 prepared with the Cu/Zn ratio of 3:7 exhibited a very high Fenton-like activity in the pH range 5-9. The enhanced photocatalytic activity of ZnFeO-Cu3 could be because the formed ZnFeO/CuO heterojunction improved the separation efficiency of the photogenerated carriers. The photogenerated hole was responsible for Orange II degradation. As for the Fenton-like reaction, O was the active species, and the surface ≡Cu with a higher redox ability should be the active site for HO activation despite its lower surface content than that of ≡Cu, ≡Fe, and ≡Fe. Finally, a possible pathway for Orange II degradation was proposed according to the liquid chromatography-mass spectrometry result.
一系列氧化铜修饰的 ZnFeO 样品通过水热法制备，并被用作 Orange II 的光催化和类 Fenton 降解的催化剂。还研究了这两个过程中的活性物质和催化剂活性位。结果表明，引入的 CuO 显著提高了 ZnFeO 的光催化和类 Fenton 性能。特别是，Cu/Zn 比为 3:7 时制备的 ZnFeO-Cu3 在 pH 5-9 范围内表现出非常高的类 Fenton 活性。ZnFeO-Cu3 的光催化活性增强可能是因为形成的 ZnFeO/CuO 异质结提高了光生载流子的分离效率。光生空穴负责 Orange II 的降解。对于类 Fenton 反应，O 是活性物质，表面具有更高氧化还原能力的 ≡Cu 应该是 HO 激活的活性位，尽管其表面含量低于 ≡Cu、≡Fe 和 ≡Fe。最后，根据液相色谱-质谱结果提出了 Orange II 降解的可能途径。
