Role of Sulfites in the Water Splitting Reaction
Role of Sulfites in the Water Splitting Reaction
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DOI：
10.1007/s10953-015-0422-1
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发表时间：
2016-01-01
影响因子：
1.2
通讯作者：
Jiang, Zhaohua
中科院分区：
文献类型：
--
作者：
Li, Chunxiang;Hu, Pingan;Jiang, Zhaohua
分析了高压汞灯照射下Na2SO3-Na2S牺牲剂的光解反应，了解了反应过程中氢气的生成步骤及其在光化学反应中的作用。该牺牲剂在反应过程中生成硫代硫酸盐、二硫化物、四硫化物、游离硫和羟基自由基中间体。收集到的析氢总量与光解时间数据表明，Na2SO3和Na2S浓度对析氢速率有不同但显著的影响：低且稳定的Na2SO3浓度或高浓度的Na2S有利于氢的生成。与Na2S溶液相比，在Na2SO3-Na2S牺牲剂溶液中存在两条相互竞争的反应路径，其中主导反应路径由牺牲剂中Na2SO3的浓度决定。
Photolysis of Na2SO3-Na2S sacrificial agent under irradiation with a high-pressure Hg lamp was analyzed to gain insight into the reaction steps for hydrogen formation and the function of in the photochemical reaction. This sacrificial agent leads to the formation of thiosulfate, disulfide, tetrasulfide, free sulfur and hydroxyl radical intermediates during the reactions. The collected total volume of evolved hydrogen versus photolysis time data suggest that Na2SO3 and Na2S concentrations have different but pronounced effects on the hydrogen evolution rate: a low and stable concentrations of Na2SO3 or high concentration of Na2S facilitates hydrogen formation. In comparison with Na2S solutions, two competing reaction paths have been postulated in solutions with Na2SO3-Na2S sacrificial agent, the dominant reaction path being determined by the Na2SO3 concentration in the sacrificial agent.