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| Spectrum of •HS and Its Reactions with Oxygen in Aqueous Solution |
| FANG Hao-Jie;DONG Wen-Bo;ZHANG Ren-Xi;HOU Hui-Qi |
| Institute of Environment Science, Fudan University, Shanghai 200433, P. R. China |
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Abstract 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.
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Received: 27 December 2005
Published: 31 May 2006
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Corresponding Authors:
DONG Wen-Bo;HOU Hui-Qi
E-mail: wbdong@fudan.edu.cn, fdesi@fudan.edu.cn
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