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Environ Sci Technol

Title:		Removal of Gaseous Volatile Organic Compounds by a Multiwalled Carbon Nanotubes/Peroxymonosulfate Wet Scrubber
Author(s):		Wu J; Wang J; Liu C; Nie C; Wang T; Xie X; Cao J; Zhou J; Huang H; Li D; Wang S; Ao Z;
Address:		"Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China. Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China. School of Resources Environmental and Chemical Engineering, Nanchang University, Nanchang 330031, China. School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China. Advanced Interdisciplinary Institute of Environment and Ecology, Beijing Normal University, Zhuhai 519087, China. School of Chemical Engineering and Advanced Materials, The University of Adelaide, Adelaide, SA 5005, Australia"
Journal Title:		Environ Sci Technol
Year:		2022
Volume:		20220909
Issue:		19
Page Number:		13996 - 14007
DOI:		10.1021/acs.est.2c03590
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"In this study, a wet scrubber coupled with a persulfate-based advanced oxidation process [carbocatalysts/peroxymonosulfate (PMS)] was demonstrated to efficiently remove gaseous volatile organic compounds (VOCs). The removal efficiency of a representative VOC, styrene, was stable at above 98%, and an average mineralization rate was achieved at 76% during 2 h. The removal efficiency of the carbocatalysts/PMS wet scrubber for styrene was much higher than that of pure water, carbocatalysts/water, or PMS/water systems. Quenching experiments, electron spin resonance spectroscopy, in-situ Raman spectroscopy and density functional theory (DFT) calculations indicated that singlet oxygen ((1)O(2)) and oxidative complexes are the main reactive oxygen species and that both contributed to styrene removal. In particular, carbonyl groups (C horizontal lineO) in the carbocatalyst were found to be the active sites for activating PMS during styrene oxidation. The role of (1)O(2) was discovered to be benzene ring breaking and a possible non-radical oxidation pathway of styrene was proposed based on time-of-flight mass spectroscopy which was further verified by DFT calculations. In particular, the electron transfer process of multi world carbon nanotubes-PMS* in styrene oxidation was further studied in-depth by experiments and DFT calculations. The unstable vinyl on styrene was simultaneously degraded by the oxidative complexes and (1)O(2) into benzene, and finally oxidized by (1)O(2) into H(2)O and CO(2). This study provides an effective method for VOC removal and clearly illustrates the complete degradation mechanism of styrene in a nonradical PMS-based process by a wet scrubber"
Keywords:		"Benzene Carbon Dioxide Gases *Nanotubes, Carbon Peroxides/chemistry Reactive Oxygen Species Singlet Oxygen Styrenes *Volatile Organic Compounds Water carbocatalyst density functional theory peroxymonosulfate volatile organic compounds wet scrubber;"
Notes:		"MedlineWu, Jieman Wang, Jiangen Liu, Chuying Nie, Chunyang Wang, Teng Xie, Xiaowen Cao, Jiachun Zhou, Junhui Huang, Haibao Li, Didi Wang, Shaobin Ao, Zhimin eng Research Support, Non-U.S. Gov't 2022/09/10 Environ Sci Technol. 2022 Oct 4; 56(19):13996-14007. doi: 10.1021/acs.est.2c03590. Epub 2022 Sep 9"