Photocatalytic Degradation of Gaseous Chlorinated Ethanes on TiO_2 and sulfated TiO_2 -Effect of Surface Acidity and Conversion to Useful Alkenes-

挥发性氯代有机化合物（Volatile Chlorinated Organic Compounds，VCOCs）对动物具有毒性和致癌性，已成为严重的环境问题。二氧化钛光催化剂是降解挥发性有机化合物的理想修复技术。但在光催化降解氯代乙烷气体的过程中，光催化活性有所下降。本研究阐明了氯代乙烷的降解机理及氯代乙烷失活的原因。此外，我们发现，在没有氧气的反应气体流中，光催化降解氯代乙烷形成乙烯和氯乙烯，这是有用的烯烃的化学工业。在各种实验条件下研究了从氯化乙烷转化为这些烯烃。

Volatile chlorinated organic compounds (VCOCs) have been serious environmental problems because they are toxic and carcinogenic to animals. Titanium dioxide photocatalysts have been good candidates as the remediation technique for the degradation of VCOCs. However, the photocatalytic activity decreases during the photocatalytic degradation of gaseous chlorinated ethanes. This study has clarified the degradation mechanism of the chlorinated ethanes and the reason for the deactivation of the photocatalysis. Furthermore, we found that in the absence of oxygen in the reactant gas stream, the photocatalytic degradation of chlorinated ethanes formed ethylene and ethylene chloride which are useful alkenes for chemical industries. Conversion to these alkenes from the chlorinated ethanes was studied under various experimental conditions.