光降解
半导体
载流子
可见光谱
带隙
电场
纳米技术
兴奋剂
热液循环
材料科学
碳纤维
光化学
化学工程
碳纳米管
化学
光催化
催化作用
光电子学
有机化学
工程类
复合材料
物理
复合数
量子力学
作者
Jing Ji,Xiulan Sun,Weiyu He,Yongdi Liu,Jun Duan,Wen Li,Long D. Nghiem,Qilin Wang,Zhengqing Cai
标识
DOI:10.1016/j.seppur.2022.122066
摘要
A new type of solar active carbon-doped Bi3O4Br catalyst was synthesized by combining hydrothermal and post-thermal treatment. The activity of the material under sunlight and visible light was 3.3 times and 2.7 times that of Bi3O4Br, respectively. The C-doping on Bi3O4Br nanosheets increased the built-in electric field strength, thus significantly promoted the migration of charge carriers and enhanced the photocatalytic activity. In addition, replacing Br with C with a smaller atomic radius can shorten the interlayer spacing, which is beneficial to carrier separation. Experiments showed that the doping of C shortened the semiconductor band gap by 9.8% and expanded the absorption range of visible light. Among the photogenerated reactive species, h+ played a major role in the degradation of 1-methylpyrene (a typical polycyclic aromatic hydrocarbons), followed by O2∙- and •OH. Based on intermediate analysis and DFT calculation, we proposed the degradation mechanism and pathways. Quantitative structure–activity relationship (QSAR) analysis showed that some toxic intermediates were produced during the photocatalysis process, but the overall environmental risk was greatly reduced. This work provides new perspective for understanding non-metallic doping in semiconductor photocatalysts to enhance the built-in electric field, and this technology can be extended to other semiconductor materials.
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