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Review on photochemistry degradation of organophosphorus pesticides

YU Long1,2, LI Guang-yi1,2, DENG Xiao1, LI Qin-fen1(1 The Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Danzhou 571737, Hainan, China; 2 The Environment and Plant Protection College, South China University of Tropical Agriculture, Danzhou 571737, Hainan, China)  
The present paper reviews three kinds of organophosphorus pesticides for the photocatalytic degradation, namely, photooxidation, photohydrolysis and photoisomerization and the corresponding mechanism, photosensitizer or quenching agent as well as their functions in the degradation process. First of all, the photocatalytic degradation is generally thought of as a main transformation approach to organophosphorus pesticides in the environment. Due to its effectiveness and free-from secondary pollution, more and more attention has been attached to their transformation way in recent years. Some important factors have also been studied, including pH, lamp-house, illuminating time, original concentration of organophosphorus pesticides, the concentration of Fe3+ and H2O2, and air flux, that influence the efficiency of their photocatalytic degradation. Based on the previous research work, aspects that should be considered in the future research in this way have also been put forward. Last of all, it can be concluded that combining photocatalytic degradation technique with other efficient methods to develop effective, economic pesticide residue degradation techniques should be emphasized in the area's future research.
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