文献类型：期刊文献

英文题名：Synthesis of Z-scheme amorphous WO3-loaded TiO2 photocatalyst for enhanced photocatalytic degradation of dichloromethane: Internal electric field and mechanism exploration

作者：Gu, Xiucheng[1];Li, Chenchen[1];Jiang, Hao[1];Li, Chunzhong[1];Hu, Yanjie[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Environm Friendly Mat Tech Serv Platform, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China

年份：2024

卷号：12

期号：5

外文期刊名：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING

收录：;EI(收录号：20243416889626);WOS:【SCI-EXPANDED(收录号:WOS:001297608000001)】；

基金：This work was supported by the National Natural Science Foundation of China (22378128, 22108079, U22B20143, U22A20429) , the Science and Technology Commission of Shanghai Municipality (22dz1205900) , Project supported by Shanghai Municipal Science and Technology Major Project, the Fundamental Research Funds for the Central Universities. Additional support was provided by fringe Nobel Prize Scientist Joint Research Center.

语种：英文

外文关键词：Photocatalyst; Heterojunction; Built-in electric field; Acidity; Dichloromethane

摘要：Photocatalytic technology is a highly efficient means for treatment of volatile organic compounds (VOCs) and mitigation of environmental issues. In this study, we successfully prepared the Z-scheme WO3/TiO2 heterojunction catalyst through the impregnation sintering process. The photocatalytic performance of dichloromethane (DCM) was examined by monitoring its concentration changes under ultraviolet light irradiation. The results demonstrated that 3 % WO3/TiO2 exhibited the most excellent performance, achieving a degradation performance of 98 % under a continuous airflow of 0.8 L/min and an initial DCM concentration of 200 ppm. Importantly, the catalyst maintained its performance without any significant decrease even after 100 h of continuous testing. The excellent performance was mainly thanks to built-in electric field and narrower bandgap, which effectively reduced electron and hole complexation, thereby increasing the production of more reactive oxygen species. Gas phase capture testing revealed that center dot O2- radicals played a crucial role in DCM degradation. Additionally, the improvement of surface acidity by WO3 and preferential breaking of C-Cl bond effectively prevented the production of phosgene (COCl2). This research finding addresses the gap in the understanding of photocatalytic degradation of DCM with TiO2 modified by metal oxides and lays a strong foundation for future industrial applications.