Study of Photocalytic Oxidation Degradation Organic Phosphorus Pesticide in Aqueous with Nometer TiO2

Using semiconductor photocatalysis to degrade organic contamination has received great attention recently. In this paper, study of using the anatasena nometer TiO₂ light catalyzer loaded on the fiberglass cloth to degrade the low concentration organic phosphor pesticide dichlorovos (DDVP) in aqueous soultion was done. The results showed that the surface density of TiO₂ had great effect on the DDVP degradation. The best effect of DDVP degration can be gotten when the surface density of TiO₂ loaded was 17.5g/m₂ (corresponding quality is 1.13g), and the degradation ratio was 85.22% on catalyzing reaction in 210 minutes under this condition. Through addition the H₂O₂ and O3 oxidant in the system of nometer TiO₂/UV, the ratio of degradation improve greatly and the corresponding ratio can achieve 73% and 67% respectively in 60 minutes. Same experiment for other organic phosphorus pesticide was also done and the similar results were gotten.