Wang Feng, Ma Ning, Zheng Lei, Zhang Lu, Bian Zhaoyong, Wang Hui
College of Water Sciences, Beijing Normal University, Beijing, 100875, People's Republic of China.
College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, PR China.
Chemosphere. 2022 Nov;307(Pt 1):135666. doi: 10.1016/j.chemosphere.2022.135666. Epub 2022 Jul 9.
The Z-scheme heterojunction has received widespread attention due to it can effectively improve the photocatalytic activity of photocatalytic materials. In this paper, a p-p Z-scheme hererojunction composed of bismuth oxybromide and oxygen-rich bismuth oxybromide was synthesized via facile one-step solvothermal method. Based on the characterization results, we demonstrated that the BiOBr/BOBr Z-scheme heterojunction was synthesized by intimate interface contact between BiOBr and BOBr p-type semiconductors. This endowed the heterojunction composite with excellent photogenerated carrier transfer ability and photogenerated electron-hole separation performance compared with pure BiOBr and BOBr materials, which were proven by photoelectrochemical measurement, photoluminescence spectra. The maximum photocurrent of BiOBr/BiOBr (≈0.32 μA) is approximately 3 times that of the original BiOBr (≈0.08 μA ) when light is irradiated. In addition, the BiOBr/BOBr p-p Z-scheme composite photocatalyst had good photocatalytic activity for sulfamethoxazole, with ·O free radicals as the main active species. It could photodegrade 99% sulfamethoxazole under light irradiation at 365 nm, and its degradation rate was approximately 13 times that of BiOBr and 1.5 times that of BOBr materials. Notably, BiOBr/BOBr exhibited an excellent performance after 4 consecutive runs. Besides, the possible degradation pathway of sulfamethoxazole was proposed. This work has reference significance for the construction of p-p Z-scheme heterojunctions and the treatment of environmental contaminants.
Z 型异质结因其能有效提高光催化材料的光催化活性而受到广泛关注。本文通过简便的一步溶剂热法合成了由溴氧化铋和富氧溴氧化铋组成的 p-p Z 型异质结。基于表征结果，我们证明了 BiOBr/BOBr Z 型异质结是通过 BiOBr 和 BOBr p 型半导体之间紧密的界面接触合成的。与纯 BiOBr 和 BOBr 材料相比，这赋予了异质结复合材料优异的光生载流子转移能力和光生电子 - 空穴分离性能，这通过光电化学测量、光致发光光谱得到了证实。光照时，BiOBr/BiOBr（≈0.32 μA）的最大光电流约为原始 BiOBr（≈0.08 μA）的 3 倍。此外，BiOBr/BOBr p-p Z 型复合光催化剂对磺胺甲恶唑具有良好的光催化活性，以·O 自由基为主要活性物种。在 365 nm 光照下，它能光降解 99%的磺胺甲恶唑，其降解速率约为 BiOBr 的 13 倍和 BOBr 材料的 1.5 倍。值得注意的是，BiOBr/BOBr 在连续运行 4 次后仍表现出优异的性能。此外，还提出了磺胺甲恶唑可能的降解途径。这项工作对 p-p Z 型异质结的构建和环境污染物的处理具有参考意义。
