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Citation: FANG Hao-Jie, DONG Wen-Bo, ZHANG Ren-Xi, HOU Hui-Qi. Spectrum of •HS and Its Reactions with Oxygen in Aqueous Solution[J]. Acta Physico-Chimica Sinica, ;2006, 22(06): 761-763. doi: 10.3866/PKU.WHXB20060623 shu

Spectrum of •HS and Its Reactions with Oxygen in Aqueous Solution

1.
Institute of Environment Science, Fudan University, Shanghai 200433, P. R. China

Received Date: 27 December 2005
Available Online: 31 May 2006

The 266 nm laser photolysis formation and chemical behavior of •HS in aqueous solution have been studied by laser photolysis-transient absorption technique. The 266 nm laser photolysis of H2O2 leads to the formation of •OH, which reacts with H2S to produce •HS, while solutions of HS− can also be directly photolyzed with 266 nm laser pulses to produce •HS radical. The transient UV-Vis absorption spectrum of •HS has been attributed to 220~300 nm with a maximum absorption at 220 nm and a shoulder at 250~270 nm. The chemical behavior of •HS is very active in oxygen saturated aqueous solution:•HS will first react with oxygen to form •SO2−, which further reacts with another oxygen molecule with the production of SO2 and •O2−. In acid solution, •O2− immediately protonates to form •HO2.
- Laser photolysis- transient absorption;•HS;Aqueous phase;H2S
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