| Z型异质结Au/CoWO4/g-C3N4的制备及其光催化降解性能 |
| Preparation of Au/CoWO4/g-C3N4 Z-Scheme Heterojunction Photocatalyst with Efficient Photodegradation Activity |
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| 摘要: 采用浸渍-煅烧方法将Au引入到g-C3N4纳米片（CNs）与CoWO4复合材料中得到Z型异质结光催化剂Au/CoWO4/CNs（Au/ CoNs-x，x=5、10、20、50）。Au作为电荷传输通道加快了光生电子从CoWO4迁移至CNs的速度。与CoWO4/CNs相比，Au/CoNs-10展示出优异的光催化降解亚甲基蓝和盐酸四环素活性，其表观速率常数分别从0.289和0.360 h-1提升至0.499和0.637 h-1。光电测试与自由基捕获实验表明，Au/CoNs-10光催化性能的显著提升主要是由于Z型异质结的构建降低了光生电子-空穴的复合速率，同时促使具有高氧化活性的羟基自由基（·OH）和超氧自由基（·O2-）的形成。 |
| 关键词: Z型异质结 光催化降解 载流子分离 |
| 基金项目: 江苏省大创项目（No.2022DC0579，2022DC0578）和国家自然科学基金（No.21776129）资助 |
| Abstract: The Z-scheme heterojunction photocatalyst Au/CoWO4/CNs (Au/CoNs-x, x=5, 10, 20, 50) was obtained by introducing Au into g-C3 N4 nanosheets (CNs) and CoWO4 composites via impregnation-calcination method. The introduction of Au could be a charge transport channel to accelerate the transfer of photogenerated electrons from CoWO 4 to CNs. Compared with CoWO 4/CNs, Au/CoNs-10 exhibited excellent photocatalytic activity for the degradation of methylene blue and tetracycline hydrochloride, and their apparent rate constants were improved from 0.289 and 0.360 h-1 to 0.499 and 0.637 h-1, respectively. Optical and electrical tests and free radical trapping experiments indicate that the significantly improved photocatalytic performance of Au/CoNs-10 is mainly due to the construction of Z-scheme heterojunction, which reduces the recombination rate of photogenerated electrons and holes, promotes high oxidation activity and accelerates the formation of hydroxyl radicals (·OH) and superoxide radicals (·O2-) with high oxidation ability. |
| Keywords: Z-scheme heterojunction photocatalytic degradation carrier separation |
| 投稿时间：2022-05-25 修订日期：2022-09-08 |
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| 熊翠蓉,李玮宁,胡浩,蔡琼,孔岩.Z型异质结Au/CoWO4/g-C3N4的制备及其光催化降解性能[J].无机化学学报,2022,38(11):2222-2230. |
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