水相中·HS的光谱表征及其与氧气的反应研究  

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

作　　者：房豪杰[1] 董文博[1] 张仁熙[1] 侯惠奇[1] 

机构地区：[1]复旦大学环境科学研究所,上海200433

出　　处：《物理化学学报》2006年第6期761-763,共3页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(20507004;20377009);上海同济高廷耀环保科技发展基金会资助项目

摘　　要：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 266 nm laser photolysis formation and chemical behavior of ·H S 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.

关 键 词：激光光解-瞬态吸收 ·HS 水相 H2S 

分 类 号：O643.1[理学—物理化学]