摘要
在模拟大气环境中,紫外光照射以及纳米TiO2光催化剂的作用下,气相无机污染物SO2被完全氧化为SO3或H2SO4。本文提出了SO2的非均相光催化氧化机理,并得出光催化反应速率符合一级动力学过程;经过连续使用之后,TiO2的光催化活性降低,最后活性消失;经过水洗之后,失活的TiO2可以得到再生。失活的TiO2和新鲜的TiO2的IR和XPS光谱差异表明,失活的TiO2表面存在H2SO4,其被认为是使催化剂失活的成分。
The photocatalytic oxidation （PCO） of SO2 over UV-illuminated TiO2 was carried out at room temperature in a batch reactor. Complete oxidation of SO2 to produce SO3 and H2SO4 was observed. A possible PCO mechanism of SO2 over TiO2 was suggested. The reaction rate was observed to fit first-order kinetics. The used TiO2 has reduced photocatalytic activity and eventually present no activity after being used consecutively. The deactivated TiO2 can be regenerated by washing with water. The differences of IR and XPS spectra of the fresh and deactivated TiO2 indicated that there was H2SO4 species on the deactivated TiO2 surface, which was considered to be the deactivating species.
出处
《环境污染治理技术与设备》
CSCD
北大核心
2005年第11期28-31,共4页
Techniques and Equipment for Environmental Pollution Control
基金
北京市教委基金资助项目(KM200311417141)
