Previous study has shown that the multi-walled carbon nanotubes/titanium dioxide(MWNTs/TiO_2)composite photocatalyst has higher adsorption and photocatalytic activity than TiO_2 alone. In this study, omethoate, a highly toxic organophosphorus pesticide, was selected as the degradation target and the degradation efficiency and mechanism of MWNTs/TiO_2 were studied. The effects of initial pH, dosage, temperature, light intensity and initial concentration of omethoate on the degradation efficiency of MWNTs/TiO_2 were investigated. The study provid...