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利用激光光解-瞬态吸收技术探讨了水相·HS自由基的产生及其在水溶液中的化学行为.实验中利用·OH与H2S反应以及266nm激光直接光解HS-两种途径产生了·HS,通过光谱解析,得到了·HS的紫外-可见吸收光谱:吸收范围为220￣300nm,最大吸收在220nm,并且在250￣270nm有肩峰.进一步的研究结果表明,氧气饱和的水溶液中,·HS的化学行为非常活泼,它首先与O2反应生成·SO2-,·SO2-继续与O2发生电子转移反应生成SO2和·O2-,后者在酸性条件下会很快地质子化生成·HO2.
The laser photolysis-transient absorption technique was used to investigate the generation of aqueous HS radical and its chemical behavior in aqueous solution. In the experiment, the interaction between · OH and H2S and the direct laser photolysis of 266 nm laser were used to generate HS, the UV-Vis absorption spectra of HS were obtained by spectroscopic analysis: the absorption range was 220-300 nm, the maximum absorption was at 220 nm, and the shoulder peak was at 250-270 nm.Further results showed that in oxygen-saturated aqueous solution, HS is chemically very reactive. It first reacts with O2 to form SO2-. SO2- continues to react electron transfer with O2 to form SO2 and O2-, which are rapidly protonated to form HO2 under acidic conditions .