title: Abatement and degradation pathways of toluene in indoor air by positive corona discharge.
abstract: Indoor air concentrations of volatile organic compounds often exceed outdoor levels by a factor of 5. There is much interest in developing new technologies in order to improve indoor air quality. In this work non-thermal plasma (DC positive corona discharge) is explored as an innovative technology for indoor air purification. An inlet gas stream of 10 l min(-1) containing 0.50+/-0.02 ppm toluene was treated by the plasma reactor in atmospheric conditions. Toluene removal proved to be achievable with a characteristic energy density epsilon(0) of 50 J l(-1). Removal efficiencies were higher for 26% relative humidity (epsilon(0)=35 J l(-1)), compared with those at increased humidities (50% relative humidity, epsilon(0)=49 J l(-1)). Reaction products such as formic acid, benzaldehyde, benzyl alcohol, 3-methyl-4-nitrophenol, 4-methyl-2-nitrophenol, 4-methyl-2-propyl furan, 5-methyl-2-nitrophenol, 4-nitrophenol, 2-methyl-4,6-dinitrophenol are identified by means of mass spectrometry. Based on these by-products a toluene degradation mechanism is proposed.
authors.affiliation: Research Group EnVOC, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium.
authors.forename: J
authors.initials: J
authors.lastname: Van Durme
authors.forename: J
authors.initials: J
authors.lastname: Dewulf
authors.forename: W
authors.initials: W
authors.lastname: Sysmans
authors.forename: C
authors.initials: C
authors.lastname: Leys
authors.forename: H
authors.initials: H
authors.lastname: Van Langenhove
mesh_terms: D016902:Air Pollution, Indoor / Q000032:analysis / Q000517:prevention & control*; D004563:Electrochemistry; D006813:Humidity; D015394:Molecular Structure; D014050:Toluene / Q000737:chemistry*; D014835:Volatilization
chemical_list: D014050:Toluene