Abstract In this work, Zn/ZnO composite photocatalyst was successfully synthesized by simple hydrothermal method. Photocurrent test shows that the presence of Zn can effectively improve the light response of composites. Electrochemical impedance spectroscopy indicates that Zn/ZnO has higher point and separation efficiency and faster carrier transmission. Degradation tests of methyl orange showed that Zn/ZnO had higher degradation efficiency than commercial ZnO. In the same time, Zn/ZnO can degrade nearly 90% of methyl orange, while commercial zinc oxide has less than 10%. Meanwhile, the photocatalyst synthesized in the test of photocatalytic removal of NO also shows higher photocatalytic activity. Compared with commercial ZnO, which removed 48% of NO in 20 min, Zn/ZnO could remove 74% of NO in 8 min, and NO will be further oxidized to NO 3 − after being oxidized to NO 2 , which can effectively reduce secondary pollution in the reaction process. These results indicate that Zn/ZnO composite photocatalysts have high photocatalytic activity in both solid–liquid and gas–solid systems. Graphic Abstract Photodegradation of MO (a), and NO removal (b) photocatalytic mechanism of Zn/ZnO under irradiation.

中文翻译：

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用于 MO 降解和 NO 去除的 Zn/ZnO 异质结构

摘要 本工作采用简单的水热法成功合成了Zn/ZnO复合光催化剂。光电流测试表明，Zn的存在可以有效改善复合材料的光响应。电化学阻抗谱表明Zn/ZnO具有更高的点分离效率和更快的载流子传输。甲基橙的降解试验表明，Zn/ZnO 比商品 ZnO 具有更高的降解效率。同时，Zn/ZnO 可以降解近 90% 的甲基橙，而商用氧化锌则不到 10%。同时，在光催化脱除NO试验中合成的光催化剂也表现出较高的光催化活性。与商用 ZnO 在 20 分钟内去除 48% 的 NO 相比，Zn/ZnO 可以在 8 分钟内去除 74% 的 NO，NO氧化成NO 2 后进一步氧化成NO 3 - ，可有效减少反应过程中的二次污染。这些结果表明 Zn/ZnO 复合光催化剂在固-液和气-固体系中均具有较高的光催化活性。图解摘要 MO 的光降解 (a) 和 NO 去除 (b) Zn/ZnO 在辐照下的光催化机制。