基片上镀TiO_2薄膜光催化降解有机磷农药

Degradation of Pesticide by Photo-catalysis with Titanium Dioxide Thin Films

以基片上镀TiO2薄膜为光催化剂降解有机磷农药. 结果表明,基片为铜丝比基片为钛网和硅片时光催化降解率高;随光照时间延长,光降解率增大;当溶液pH值为2时,光降解率最高;对于钛网,当退火温度为450oC时光催化降解率最大;用HNO3调节溶液pH值比用H2SO4和HCl调节光降解率高;膜使用次数越多,光催化活性越小;硫杆磷酸酯类农药比磷酸酯类农药更容易发生光催化降解;农药浓度越稀,越容易进行光催化降解. 当用铜丝作为基底物、光照时间为60 min 时,光催化降解率可高于80%.

The feasibility study on degradation of organic phosphorous pesticide by photo-catalysis at the surface of titanium dioxide thin films was carried out. The films were prepared over different substrates by lower pressurechemical vapor deposition. The factors influencing the degradation rate of organic phosphorous pesticide were investigated. It was found that the optimal conditions for photo-catalytic conversion are copper wire as the substrate, annealing the film at 450oC and using the film as quickly as possible after it is deposited. It is also shown that when the pH of solution is equal to 2 and nitric acid is used to adjust pH, the degradation conversion is higher.