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Abstract: The reaction mechanism of 3-chlorophenol with OH, H in aqueous solution was studied by transient technology. The 3-chlorophenol aqueous solutions have been saturated with air or N[sub 2] previously. Under alkaline condition, the reaction of OH radical with 3-chlorophenol produces 3-chlorinated phenoxyl radical, with the absorption peaks at 400 nm and 417 nm. Under neutral condition, the reaction of OH radical with 3-chlorophenol produces OH-adduct with the maximal absorption at about 340 nm. And in acid solution, the reaction of H with 3-chlorophenol produces H-adduct with the maximal absorption at about 320 nm. 3-chlorophenol is compared with 4- and 2-chlorophenols from the free radical pathways. The results show that the positions of chlorine on the aromatic ring strongly influence the dehalogenation and degradation process. [ABSTRACT FROM AUTHOR]

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 (185/253.7nm) and iodine lamp (178.3/180.1/183/184.4/187.6/206.2nm)). Experiments results showed that the removal efficiency () 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 36mm, gas flow rate of 0.42standardls−1, was 52% with initial H2S concentration of 19.5mgm−3 by microwave mercury lamp, the absolute removal amount (ARA) was 4.30μgs−1, and energy yield (EY) was 77.3mgkWh−1; was 56% with initial H2S concentration of 18.9mgm−3 by microwave iodine lamp, the ARA was 4.48μgs−1, and the EY was 80.5mg kWh−1. The main photolysis product was confirmed to be with IC. [Copyright &y& Elsevier]