title: Photolysis of low concentration H2S under UV/VUV irradiation emitted from high frequency discharge electrodeless lamps.
abstract: The photolysis of low concentration of H2S malodorous gas was studied under UV irradiation emitted by self-made high frequency discharge electrodeless lamp with atomic mercury lines at 185/253.7nm. Experiments results showed that the removal efficiency (ηH2S) of H2S was decreased with increasing initial H2S concentration and increased slightly with gas residence time. ηH2S was increased dramatically with relative humidity from<5% to 43% while the concentration of oxygen in gas environments affected the removal of H2S. The mechanisms for direct and indirect photolysis (generation of ozone) were illustrated by the experimental results on photolysis of H2S under argon environments and ozonation of H2S under air environments, respectively. The overall ηH2S by photolysis is higher than the combination of ηH2S by direct photolysis and ozonation, suggesting that hydroxyl radical-mediated indirect photolysis played an important role during photolysis processes. The main photolysis product was confirmed to be SO4(2-) with ion chromatograph.
authors.affiliation: Environmental Science & Engineering Research Center, Harbin Institute of Technology, Shenzhen Graduate School, Shenzhen, PR China. Electronic address: 273857069@qq.com.
authors.forename: Jianhui
authors.initials: J
authors.lastname: Xu
authors.affiliation: Environmental Science & Engineering Research Center, Harbin Institute of Technology, Shenzhen Graduate School, Shenzhen, PR China. Electronic address: lichaolinhit@gmail.com.
authors.forename: Chaolin
authors.initials: C
authors.lastname: Li
authors.affiliation: Environmental Science & Engineering Research Center, Harbin Institute of Technology, Shenzhen Graduate School, Shenzhen, PR China. Electronic address: 345222664@qq.com.
authors.forename: Peng
authors.initials: P
authors.lastname: Liu
authors.affiliation: School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia. Electronic address: di.he@unsw.edu.au.
authors.forename: Di
authors.initials: D
authors.lastname: He
authors.affiliation: Environmental Science & Engineering Research Center, Harbin Institute of Technology, Shenzhen Graduate School, Shenzhen, PR China. Electronic address: 229057115@qq.com.
authors.forename: Jianfeng
authors.initials: J
authors.lastname: Wang
authors.affiliation: Environmental Science & Engineering Research Center, Harbin Institute of Technology, Shenzhen Graduate School, Shenzhen, PR China. Electronic address: 173403631@qq.com.
authors.forename: Qian
authors.initials: Q
authors.lastname: Zhang
mesh_terms: D002852:Chromatography, Ion Exchange; D005740:Gases / Q000737:chemistry; D006862:Hydrogen Sulfide / Q000737:chemistry*; D017665:Hydroxyl Radical / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry; D010126:Ozone / Q000737:chemistry; D010782:Photolysis; D013447:Sulfites / Q000032:analysis; D014466:Ultraviolet Rays
chemical_list: D005740:Gases; D013447:Sulfites; D017665:Hydroxyl Radical; D010126:Ozone; D010100:Oxygen; D006862:Hydrogen Sulfide
keywords: H(2)S; High frequency discharge electrodeless lamp; Photolysis; UV irradiation