在高频放电无电极灯发出的 UV/VUV 辐射下，低浓度 H2S 的光解。
Photolysis of low concentration H2S under UV/VUV irradiation emitted from high frequency discharge electrodeless lamps.
机构信息
Environmental Science & Engineering Research Center, Harbin Institute of Technology, Shenzhen Graduate School, Shenzhen, PR China.
School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia.
出版信息
Chemosphere. 2014 Aug;109:202-7. doi: 10.1016/j.chemosphere.2014.01.065. Epub 2014 Feb 26.
The photolysis of low concentration of H2S malodorous gas was studied under UV irradiation emitted by self-made high frequency discharge electrodeless lamp with atomic mercury lines at 185/253.7nm. Experiments results showed that the removal efficiency (ηH2S) of H2S was decreased with increasing initial H2S concentration and increased slightly with gas residence time. ηH2S was increased dramatically with relative humidity from<5% to 43% while the concentration of oxygen in gas environments affected the removal of H2S. The mechanisms for direct and indirect photolysis (generation of ozone) were illustrated by the experimental results on photolysis of H2S under argon environments and ozonation of H2S under air environments, respectively. The overall ηH2S by photolysis is higher than the combination of ηH2S by direct photolysis and ozonation, suggesting that hydroxyl radical-mediated indirect photolysis played an important role during photolysis processes. The main photolysis product was confirmed to be SO4(2-) with ion chromatograph.
研究了在自制的高频无极放电灯发射的紫外光（185/253.7nm 汞原子谱线）辐照下，低浓度 H2S 恶臭气体的光解。实验结果表明，随着初始 H2S 浓度的增加，H2S 的去除效率（ηH2S）降低，而气体停留时间略有增加。随着相对湿度从<5%增加到 43%，ηH2S 显著增加，而氧气浓度对 H2S 的去除有影响。通过在氩气环境下光解 H2S 和在空气环境下臭氧化 H2S 的实验结果，分别说明了直接和间接光解（臭氧生成）的机制。光解的总 ηH2S 高于直接光解和臭氧化的 ηH2S 的总和，这表明羟基自由基介导的间接光解在光解过程中起重要作用。用离子色谱仪确定了主要的光解产物为 SO4(2-)。
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