| Title: | Mechanistic insights into toluene degradation under VUV irradiation coupled with photocatalytic oxidation |
| Author(s): | Liang S; Shu Y; Li K; Ji J; Huang H; Deng J; Leung DYC; Wu M; Zhang Y; |
| Address: | "School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, PR China. Guangdong Indoor Air Pollution Control Engineering Research Center, Sun Yat-sen University, Guangzhou 510006, PR China. School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, PR China; Guangdong Indoor Air Pollution Control Engineering Research Center, Sun Yat-sen University, Guangzhou 510006, PR China. Electronic address: seabao8@gmail.com. College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, PR China. Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China" |
| DOI: | 10.1016/j.jhazmat.2020.122967 |
| ISSN/ISBN: | 1873-3336 (Electronic) 0304-3894 (Linking) |
| Abstract: | "Volatile organic compounds (VOCs) exists ubiquitously in chemical industries and were regarded as major contributors to air pollution, which should be strictly regulated. Vacuum ultraviolet irradiation coupled with photocatalytic oxidation (VUV-PCO) has been considered as an efficient approach to VOCs removal due to high-energy photons which could break down VOCs directly and be absorbed by photocatalysts to generate free radicals for further oxidation. However, the photochemical transformation mechanisms of VOCs have not been fully revealed. Herein, we systematically analyzed the intermediates using proton-transfer-reaction mass spectrometer (PTR-MS) to explore the transformation mechanisms of toluene degradation in VUV and VUV-PCO processes. VUV-PCO process displayed superior toluene degradation efficiency (50 %) and mineralization efficiency (65 %) compared with single VUV photolysis (35 %) and UV photocatalysis (5 %). TiO(2) was deeply involved into CO(2) generalization by amplifying the advantages of VUV system and further mineralizing the intermediates. In VUV and VUV-PCO processes, O(2) participation changed the intermediates distribution by increasing multiple oxygenated products, while the introduction of water contributed to the formation and degradation of most intermediates. A possible degradation mechanism of toluene under VUV irradiation combined with TiO(2) was proposed. This study provides a deep mechanistic insight into VOCs degradation by VUV-PCO process" |
| Keywords: | Degradation mechanisms Intermediates Photocatalysis VOCs Vuv; |
| Notes: | "PubMed-not-MEDLINELiang, Shimin Shu, Yajie Li, Kai Ji, Jian Huang, Haibao Deng, Jiguang Leung, Dennis Y C Wu, Muyan Zhang, Yingguang eng Research Support, Non-U.S. Gov't Netherlands 2020/06/07 J Hazard Mater. 2020 Nov 15; 399:122967. doi: 10.1016/j.jhazmat.2020.122967. Epub 2020 May 25" |
