文献类型：期刊文献

英文题名：Built-in electric field enabled in carbon-doped Bi3O4Br nanocrystals for excellent photodegradation of PAHs

作者：Ji, Jing[1];Sun, Xianbo[1];He, Weiyu[1];Liu, Yongdi[1];Duan, Jun[2];Liu, Wen[2];Nghiem, Long D.[3];Wang, Qilin[3];Cai, Zhengqing[1,4]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Ind Wastewater Detoxicat & Reso, Shanghai 200237, Peoples R China;[2]Peking Univ, Coll Environm Sci & Engn, Key Lab Water & Sediment Sci, Minist Educ, Beijing 100871, Peoples R China;[3]Univ Technol Sydney, Ctr Technol Water & Wastewater, Sch Civil & Environm Engn, Ultimo, NSW 2007, Australia;[4]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200237, Peoples R China

年份：2022

卷号：302

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：;EI(收录号：20223712735037);WOS:【SCI-EXPANDED(收录号:WOS:000874530200001)】；

基金：Acknowledgments This study was financially supported by the National Key R&D Pro-gram of China (2019YFC0408200) , Natural Science Foundation of Shanghai [21ZR1415600] , and the National Natural Science Foundation of China [41807340] .

语种：英文

外文关键词：Photocatalytic; C-Bi3O4Br; Internal electric field; Electron-hole pair; PAHs

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 O-2(center dot-) and center dot 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.