文献类型：期刊文献

英文题名：C-doped Bi3O4X nanosheets with self-induced internal electric fields for pyrene degradation: Effects of carbon and halogen element type on photocatalytic activity

作者：Song, Yanyu[1];He, Weiyu[1];Sun, Xianbo[1];Lei, Juying[1];Nghiem, Long D.[2];Duan, Jun[2,3];Liu, Wen[4,5];Liu, Yongdi[1];Cai, Zhengqing[1,5]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Ind Wastewater Detoxicat & Resou, Shanghai 200237, Peoples R China;[2]Univ Technol Sydney, Ctr Technol Water & Wastewater, Sch Civil & Environm Engn, Ultimo, NSW 2007, Australia;[3]Purdue Univ, Dept Agron, W Lafayette, IN 47907 USA;[4]Peking Univ, Coll Environm Sci & Engn, Key Lab Water & Sediment Sci, Minist Educ, Beijing 100871, Peoples R China;[5]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200237, Peoples R China

年份：2023

卷号：323

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：;EI(收录号：20232614328113);WOS:【SCI-EXPANDED(收录号:WOS:001038962400001)】；

基金：This study was financially supported by the National Natural Science Foundation of China (22176061, 41807340) , Natural Science Foundation of Shanghai [21ZR1415600] , and the Science and Technology Commission of Shanghai Municipality (21230712000) .

语种：英文

外文关键词：Carbon doping; Internal electric field; Halogen species; Photocatalysis

摘要：A series of C-doped Bi3O4X (X = Cl, Br, I) photocatalysts with layer-stacked structure was synthesized using glucose as carbon source, and the carbon doping and halogen species on harvesting broader solar spectrum and promoting charge carrier separation were systematically investigated. For pyrene photolysis, the photo -degradation rate of pristine materials followed the order of Bi3O4I > Bi3O4Br > Bi3O4Cl, which was attributed to the difference in electronegativity of the halogen elements. The doped carbon boosted photocatalytic perfor-mance and the optimal C/Bi3O4I achieved 100% pyrene removal within 20 min, which primarily benefited from the dramatic improvement of the internal electric field (IEF). The improved IEF further increased the separation and transfer efficiency of photogenerated charge carriers. XRD and XPS characterizations confirmed that the doped carbon implanted into the lattice of [X] layers, and mainly affected the X np states. The X np orbitals contributed to the valence band (VB) of Bi3O4X, thus the local occupied states induced by doped carbon formed above VB and significantly decreased the VB potential. Meanwhile, the doped carbon narrowed the band gap and greatly improved visible light utilization. The & BULL;O2 , h+ and & BULL;OH were identified as dominant active species for pyrene degradation, and the generation rate of & BULL;O2  and & BULL;OH was further measured by the probe technique. Moreover, the photodegradation pathways of pyrene were proposed and the ecotoxicity of intermediates was assessed. This study reveals the effect of halogen species on photocatalytic activity and provides guidance for enhancing IEF by doping inorganic element.