【摘要】 采用高温活化处理过的纳米锐钛型TiO2 为催化剂,研究了各种因素对有机磷农药的代表性化合物———甲基对硫磷超声降解反应的影响.结果表明,在纳米锐钛型TiO2 的作用下,甲基对硫磷的超声降解效果明显优于单纯使用超声的降解.降解过程符合一级动力学反应.在超声波频率40kHz,输出功率5 0W ,催化剂用量10 0 0mg·L- 1 ,pH为5 0 0 ,温度为2 0℃,甲基对硫磷水溶液初始浓度5 0mg·L- 1 的条件下,5 0min时的降解率即可达到95 %以上.更多还原

【Abstract】 A variety of affecting factors on ultrasonic degradation of methylparathion pesticide, a kind of typical organophosphate insecticides, by adopting nano anatase TiO₂ catalyst after treatment of high-temperature activation was studied. The results indicated that the effects of ultrasonic degradation were more obvious in the presence of nano anatase TiO₂ than in absence of any TiO₂. The ultrasonic degradation kinetics of methylparathion pesticide in the presence of nano anatase TiO₂ catalyst followed the first-order reaction. The degradation ratio of methylparathion pesticide surpassed 95.0 % within 50?min under the experimental conditions such as ultrasonic frequency of 40?kHz, output power of 50?W, amount of 1000?mg/L TiO₂ catalyst, pH of 5.00, and temperature of 20 ℃, when the initial methylparathion pesticide concentration of 50?mg/L更多还原