College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, 030024, China; Shenzhen Batian Ecological Engineering Co. Ltd., Shenzhen, 518057, China.
College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, 030024, China.
Chemosphere. 2019 Nov;235:767-775. doi: 10.1016/j.chemosphere.2019.06.231. Epub 2019 Jul 1.
BiOBr-based photocatalysts hold great promise in the application of organic wastewater treatment and air purification. However, the catalysis ability of photocatalyst is greatly limited by its poor reduction capacity and intrinsic high recombination rate of photo-generated charge carriers. In this work, a novel direct Z-scheme BiOBr/BiOBr photocatalyst is prepared via a facile hydrolysis route at room temperature, which exhibits highly enhanced performance for resorcinol degradation and NO removal than pure BiOBr and BiOBr. The formation of the direct Z-scheme heterojunction is substantiated by radical scavenging experiments and the analysis of electronic structure, and it benefits the photocatalytic reaction by accelerating the charge separation and improving the redox ability. Finally, the underlying photocatalytic mechanism is elucidated based on the band structure and radical scavenging experiments. This study provides a facile strategy for bismuth halide Z-scheme heterojunction constructing at room temperature and also sheds light on highly efficient photocatalysts designing.
基于 BiOBr 的光催化剂在有机废水处理和空气净化的应用中具有很大的应用前景。然而，光催化剂的催化能力受到其还原能力差和光生载流子内在高复合率的极大限制。在这项工作中，通过在室温下的简便水解方法制备了一种新型的直接 Z 型 BiOBr/BiOBr 光催化剂，其在间苯二酚降解和 NO 去除方面的性能比纯 BiOBr 和 BiOBr 有了显著提高。通过自由基捕获实验和电子结构分析证实了直接 Z 型异质结的形成，这有利于光催化反应，加速了电荷分离并提高了氧化还原能力。最后，根据能带结构和自由基捕获实验阐明了潜在的光催化机制。这项研究为在室温下构建卤化铋 Z 型异质结提供了一种简便的策略，也为高效光催化剂的设计提供了思路。
