摘要
研究了在太阳光的照射下，ＴｉＯ２薄层光催化降解有机磷农药的可行性。结果表明，０．６５×１０－４ｍｏｌ·Ｌ－１的久效磷、甲拌磷农药光照他可完全降解至ＰＯ４３－；加入微量的Ｈ２Ｏ２或通入空气可大大提高光解率；有机磷农药初始浓度增加，其光解率下降；光照１２０ｈ后ＴｉＯ２薄层的光催化活性没有减弱，可以连续使用。初步探讨了有机磷农药光催化降解的机理，认为·ＯＨ和Ｏ２２－是最主要的氧化剂。
This paper studied the feasibility of photocatalytic degradation of organophosphorous pesticides using thin films of TiO2 under solar radiation. The results showed that 0. 65×10-4mol. L-1 of monocrotophos. phorate can be completely photocatalytic degraded into PO43- after illumination for 4h the photodegradation efficiencies were respectively enhanced significantly by adding a little amount of H2O2 or flow of air. the photodegradation efficiency decreased with increasing initial concentration of the organophosphorous pesticides. After 120h illumination.there was no significant loss of photocatalytic activity of TiO2. it could be used continually. possible mechanisms of the photocatalytic degradation of organophosphorous pesticides would be discussed. OH and O22- as primary oxidizing species are proposed.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
1995年第3期234-239,共6页
Acta Energiae Solaris Sinica
关键词
太阳光
光催化降解
有机磷农药
TiO_2薄层
solar radiation photocatalytic degradation. organophosphorous pesticides. thin hims of TiO_2
