氯苯
离解(化学)
激子
光化学
化学
表面电荷
活性氧
光催化
材料科学
化学物理
化学工程
物理化学
物理
有机化学
催化作用
生物化学
量子力学
工程类
作者
Yanbiao Shi,Chenchen Zhang,Zhiping Yang,Xupeng Liu,Xu Zhang,Cancan Ling,Jundi Cheng,Chuan Liang,Chengliang Mao,Lizhi Zhang
标识
DOI:10.1021/acs.jpcc.2c07341
摘要
Semiconductor-based photocatalytic O2 activation is a facile, green, yet versatile strategy to produce reactive oxygen species (ROS) for environmental remediation and pollution control but suffers from low ROS generation rate. Herein, we demonstrate that a simple surface phosphorylation can greatly enhance the O2 photoactivation of BiOBr to produce superoxide radical (·O2–) via boosting exciton dissociation. The phosphorylated BiOBr surface establishes an interfacial electrostatic field from the bulk to the surface, and weakens the surface Bi–O bonds to induce oxygen vacancy (VO) generation simultaneously. This interfacial electrostatic field attenuates the exciton binding energy (Eb) from 266 to 89 meV, facilitating the dissociation of excitons to charge carriers, i.e., electrons and holes. Driven by the interfacial electrostatic field, the photoinduced electrons migrate to and are confined by the surface VO, thus activating absorbed O2 to the superoxide radical (·O2–). As a result, surface phosphorylated BiOBr could degrade the synthetic chlorobenzene solution with a 6.3 times higher rate (0.69 h–1) than BiOBr (0.11 h–1) under visible light. Impressively, this surface phosphorylated BiOBr was able to decrease the COD value of industrial chlorobenzene wastewater from 153 to 19 mg/L, below the Water Quality Standards Category III of China. This study sheds light on the design and synthesis of high-performance photocatalysts and also provides a green strategy for wastewater treatment with solar energy.
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