title: Photolysis of low concentration H2S under UV/VUV irradiation emitted from microwave discharge electrodeless lamps.
abstract: The photolysis of simulating low concentration of hydrogen sulfide malodorous gas was studied under UV irradiation emitted by self-made microwave discharge electrodeless lamps (i.e. microwave UV electrodeless mercury lamp (185/253.7 nm) and iodine lamp (178.3/180.1/183/184.4/187.6/206.2 nm)). Experiments results showed that the removal efficiency (eta H2S) of hydrogen sulfide was decreased with increasing initial H2S concentration and increased slightly with gas residence time; H2S removal efficiency was decreased dramatically with enlarged pipe diameter. Under the experimental conditions with pipe diameter of 36 mm, gas flow rate of 0.42 standard l s(-1), eta H2S was 52% with initial H2S concentration of 19.5 mg m(-3) by microwave mercury lamp, the absolute removal amount (ARA) was 4.30 microg s(-1), and energy yield (EY) was 77.3 mg kW h(-1); eta H2S was 56% with initial H2S concentration of 18.9 mg m(-3) by microwave iodine lamp, the ARA was 4.48 microg s(-1), and the EY was 80.5mg kW h(-1). The main photolysis product was confirmed to be SO4(2-) with IC.
authors.affiliation: Institute of Environmental Science, Fudan University, Shanghai 200433, China.
authors.forename: Lan-Yan
authors.initials: LY
authors.lastname: Xia
authors.forename: Ding-Hong
authors.initials: DH
authors.lastname: Gu
authors.forename: Jing
authors.initials: J
authors.lastname: Tan
authors.forename: Wen-Bo
authors.initials: WB
authors.lastname: Dong
authors.forename: Hui-Qi
authors.initials: HQ
authors.lastname: Hou
mesh_terms: D006862:Hydrogen Sulfide / Q000737:chemistry*; D008872:Microwaves; D010777:Photochemistry; D014466:Ultraviolet Rays
chemical_list: D006862:Hydrogen Sulfide