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Mechanistic insights into toluene degradation under VUV irradiation coupled with photocatalytic oxidation.
J Hazard Mater. 2020 Nov 15; 399:122967.JH

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 %). TiO2 was deeply involved into CO2 generalization by amplifying the advantages of VUV system and further mineralizing the intermediates. In VUV and VUV-PCO processes, O2 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 TiO2 was proposed. This study provides a deep mechanistic insight into VOCs degradation by VUV-PCO process.

Authors+Show Affiliations

School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, 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.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.Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China.Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32504905

Citation

Liang, Shimin, et al. "Mechanistic Insights Into Toluene Degradation Under VUV Irradiation Coupled With Photocatalytic Oxidation." Journal of Hazardous Materials, vol. 399, 2020, p. 122967.
Liang S, Shu Y, Li K, et al. Mechanistic insights into toluene degradation under VUV irradiation coupled with photocatalytic oxidation. J Hazard Mater. 2020;399:122967.
Liang, S., Shu, Y., Li, K., Ji, J., Huang, H., Deng, J., Leung, D. Y. C., Wu, M., & Zhang, Y. (2020). Mechanistic insights into toluene degradation under VUV irradiation coupled with photocatalytic oxidation. Journal of Hazardous Materials, 399, 122967. https://doi.org/10.1016/j.jhazmat.2020.122967
Liang S, et al. Mechanistic Insights Into Toluene Degradation Under VUV Irradiation Coupled With Photocatalytic Oxidation. J Hazard Mater. 2020 Nov 15;399:122967. PubMed PMID: 32504905.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Mechanistic insights into toluene degradation under VUV irradiation coupled with photocatalytic oxidation. AU - Liang,Shimin, AU - Shu,Yajie, AU - Li,Kai, AU - Ji,Jian, AU - Huang,Haibao, AU - Deng,Jiguang, AU - Leung,Dennis Y C, AU - Wu,Muyan, AU - Zhang,Yingguang, Y1 - 2020/05/25/ PY - 2020/03/02/received PY - 2020/05/13/revised PY - 2020/05/14/accepted PY - 2020/6/7/pubmed PY - 2020/6/7/medline PY - 2020/6/7/entrez KW - Degradation mechanisms KW - Intermediates KW - Photocatalysis KW - VOCs KW - VUV SP - 122967 EP - 122967 JF - Journal of hazardous materials JO - J. Hazard. Mater. VL - 399 N2 - 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 %). TiO2 was deeply involved into CO2 generalization by amplifying the advantages of VUV system and further mineralizing the intermediates. In VUV and VUV-PCO processes, O2 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 TiO2 was proposed. This study provides a deep mechanistic insight into VOCs degradation by VUV-PCO process. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/32504905/Mechanistic_insights_into_toluene_degradation_under_VUV_irradiation_coupled_with_photocatalytic_oxidation_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(20)30956-0 DB - PRIME DP - Unbound Medicine ER -
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