School of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, China.
Environ Technol. 2009 Dec 14;30(14):1555-63. doi: 10.1080/09593330903313786.
A new approach to the simultaneous removal of SO2 and NO from flue gas, by TiO2 photocatalysis based on UV irradiation technology, is presented. Experiments on the simultaneous desulphurization and denitrification were carried out using this photocatalyst in a self-designed photocatalytic reactor. Under the optimal experimental conditions, a removal efficiency of 98% for SO2 and 50% for NO was achieved. Scanning electron microscopy, transmission electron microscopy and X-ray energy spectrometry were used to observe the surface characteristics of the TiO2 photocatalyst. It was found that the surface of the quartz sand carrier was covered with Ti, on which the Si content of the quartz sand carrier was similar to the Ti content, indicating that the quartz sand supported the TiO2 membrane well. Based on the results of X-ray photoelectron spectroscopy (XPS) and chemical analysis of the resulting products, the SO2 and NO removal mechanisms were revealed. Sulphate was the main desulphurization product and nitrite was the main denitrification product. In the removal reaction, NO was rapidly oxidized to NO2 and absorbed in the chemical reaction.
提出了一种利用 TiO2 光催化技术的新型烟气同时脱硫脱硝方法。采用自行设计的光催化反应器，用该光催化剂进行了同时脱硫脱硝实验。在最佳实验条件下，SO2 的去除率达到 98%，NO 的去除率达到 50%。利用扫描电子显微镜、透射电子显微镜和 X 射线能谱对 TiO2 光催化剂的表面特性进行了观察。结果表明，石英砂载体的表面覆盖着 Ti，石英砂载体的 Si 含量与 Ti 含量相近，表明石英砂很好地支撑了 TiO2 膜。基于 X 射线光电子能谱（XPS）和产物化学分析的结果，揭示了 SO2 和 NO 的去除机理。硫酸盐是主要的脱硫产物，亚硝酸盐是主要的脱硝产物。在去除反应中，NO 迅速被氧化为 NO2 并被吸收到化学反应中。
