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Surface Boronizing Can Weaken the Excitonic Effects of BiOBr Nanosheets for Efficient O2 Activation and Selective NO Oxidation under Visible Light Irradiation
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2022-09-29 , DOI: 10.1021/acs.est.2c03769
Yanbiao Shi 1, 2 , Zhiping Yang 2 , Lujia Shi 2 , Hao Li 1 , Xupeng Liu 2 , Xu Zhang 2 , Jundi Cheng 2 , Chuan Liang 2 , Shiyu Cao 2 , Furong Guo 2 , Xiao Liu 2 , Zhihui Ai 2 , Lizhi Zhang 1, 2
Affiliation  

The photocatalytic O2 activation for pollutant removal highly depends on the controlled generation of desired reactive oxygen species (ROS). Herein, we demonstrate that the robust excitonic effect of BiOBr nanosheets, which is prototypical for singlet oxygen (1O2) production to partially oxidize NO into a more toxic intermediate NO2, can be weakened by surface boronizing via inducing a staggered band alignment from the surface to the bulk and simultaneously generating more surface oxygen vacancy (VO). The staggered band alignment destabilizes excitons and facilitates their dissociation into charge carriers, while surface VO traps electrons and efficiently activates O2 into a superoxide radical (O2) via a one-electron-transfer pathway. Different from 1O2, O2 enables the complete oxidation of NO into nitrate with high selectivity that is more desirable for safe indoor NO remediation under visible light irradiation. This study provides a facile excitonic effect manipulating method for layered two-dimensional photocatalysts and sheds light on the importance of managing ROS production for efficient pollutant removal.

中文翻译:

表面渗硼可以削弱 BiOBr 纳米片在可见光照射下有效 O2 活化和选择性 NO 氧化的激子效应

用于污染物去除的光催化 O 2活化高度依赖于所需活性氧 (ROS) 的受控生成。在这里,我们证明了 BiOBr 纳米片的强大激子效应,这是单线态氧 ( 1 O 2 ) 生产的原型,以将 NO 部分氧化成毒性更大的中间体 NO 2,​​可以通过表面硼化通过诱导交错带排列来削弱体的表面并同时产生更多的表面氧空位(V O)。交错的能带排列使激子不稳定并促进它们解离成电荷载流子,而表面 V O捕获电子并通过单电子转移途径有效地将O 2活化成超氧自由基( O 2 ) 。与1 O 2不同, O 2 能够以高选择性将 NO 完全氧化成硝酸盐,这对于在可见光照射下安全的室内 NO 修复更为理想。本研究为层状二维光催化剂提供了一种简便的激子效应控制方法,并阐明了管理 ROS 产生对有效去除污染物的重要性。
更新日期:2022-09-29
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