In this study, a microwave discharge electrodeless lamp (MDEL) photo-degradation system coupled with anatase TiO (P25) was constructed to improve the selective degradation of NH to N. The MDEL system can generate abundant reactive oxygen species (ROS) with ultraviolet radiation at 185 nm and 254 nm during gas phase reaction. The species and content of ROS generated in the reaction system were determined by oxidation extraction spectrophotometry, and the effects of residence time, temperature, and relative humidity on the production of reactive oxygen species were investigated. In addition, the removal efficiency under different conditions such as initial ammonia concentration, relative humidity and residence time was explored. It was found that the removal rate could reach 83% when the initial ammonia concentration was 100 ppm, relative humidity was 55% and gas residence time was 5.16 s. The high-energy ultraviolet at 185 nm from MDEL could break NH molecules in advance and produced a large amount of ·NH. Besides, NH was converted to N by generating large amounts of ROS, reducing NO and nitrate generation. Our work presents a novel approach to construct a photocatalytic system for high efficiency degradation of NH.

中文翻译：

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微波放电无极灯照射下锐钛矿型TiO2光催化降解氨氮

在本研究中，构建了与锐钛矿TiO（P25）耦合的微波放电无电极灯（MDEL）光降解系统，以提高NH向N的选择性降解。MDEL系统可以在紫外线辐射下产生丰富的活性氧（ROS）气相反应期间在 185 nm 和 254 nm 处。采用氧化萃取分光光度法测定反应体系中产生的ROS的种类和含量，并考察停留时间、温度和相对湿度对活性氧产生的影响。此外，还探讨了不同条件下的去除效率，例如初始氨浓度、相对湿度和停留时间。结果发现，当氨初始浓度为100 ppm、相对湿度为55%、气体停留时间为5.16 s时，去除率可达83%。 MDEL发出的185 nm高能紫外​​线可以提前破坏NH分子，产生大量·NH。此外，NH通过产生大量ROS转化为N，减少NO和硝酸盐的生成。我们的工作提出了一种构建光催化系统以高效降解 NH 的新方法。