| Title: | "Decomposition efficiency and aerosol by-products of toluene, ethyl acetate and acetone using dielectric barrier discharge technique" |
| Address: | "School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China. Electronic address: yuhuan_1981@163.com. School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, 210044, China. Department of Chemical and Environmental Engineering, University of Nottingham Ningbo China, Ningbo, 315100, China. College of Chemistry and Environmental Engineering, Jiangsu University of Technology, Changzhou, 213001, China" |
| DOI: | 10.1016/j.chemosphere.2019.124439 |
| ISSN/ISBN: | 1879-1298 (Electronic) 0045-6535 (Linking) |
| Abstract: | "Dielectric barrier discharge (DBD) has been widely used as end-of-pipe technology to degrade low-concentration volatile organic compound (VOC) emissions. In this work, the influence of DBD conditions including discharge voltage, VOC residence time in DBD plasma, VOC initial concentration and synergistic effect of multiple VOC mixing on the decomposition efficiency of three VOCs (toluene, ethyl acetate and acetone) were investigated systematically. One focus of this work was to investigate size distribution and chemical composition of aerosol by-products. The results suggested that high discharge voltage, long residence time and low VOC initial concentration would increase VOC removal ratio and their conversion to CO(2). Among the three VOCs, toluene was easiest to form particles with a mode diameter between 40 and 100?ª+nm and most difficult to be decomposed completely to CO(2). Maximum aerosol yield from toluene was observed to account for 13.1?ª++/-?ª+1.0% of initial concentration (400?ª+ppm) in the condition of discharge voltage 6?ª+kV and residence time 0.52?ª+s. Gas chromatography-mass spectrometry analysis showed that non-nitrogen containing benzene derivatives, nitrophenol derivatives and amines were the main components of toluene aerosol by-products. For ethyl acetate and acetone, aerosols could only be produced in the condition of high discharge voltages (>7.5?ª+kV) and long gas residence time (>/=0.95?ª+s) with a bimodal distribution below 20?ª+nm. When the mixture of three VOCs was fed into the plasma, we observed a strong synergistic effect that led to higher VOC removal ratio, but lower conversion of decomposed VOCs to CO(2) and aerosols" |
| Keywords: | Acetates/*chemistry Acetone/*chemistry Aerosols/*chemistry Carbon Dioxide/chemistry Environmental Restoration and Remediation/methods Gas Chromatography-Mass Spectrometry Particle Size Toluene/analysis/*chemistry Volatile Organic Compounds/analysis/*chemi; |
| Notes: | "MedlineYu, Huan Hu, Wei He, Jun Ye, Zhaolian eng England 2019/08/04 Chemosphere. 2019 Dec; 237:124439. doi: 10.1016/j.chemosphere.2019.124439. Epub 2019 Jul 25" |
