考察了应用超声波降解水中低浓度乙酰甲胺磷农药的可行性,探讨了声强、超声时间、乙酰甲胺磷初始浓度、pH值和添加纳米TiO2等对降解效果的影响。结果表明:在一定范围内,声强越大,超声时间越长,乙酰甲胺磷的降解率越高,初始浓度越大,在相同时间内降解率越低,相对于中性条件,pH值偏酸或偏碱均有利于乙酰甲胺磷的降解;加入高温活化的纳米TiO2有助于提高乙酰甲胺磷的降解率;在超声频率25 kHz,声强为60 W/cm2,纳米TiO2用量为1.0 g/L,pH值为2.5,25℃下经1 h超声处理后,乙酰甲胺磷的降解率可达85%。

Degradation of acephate pesticide by ultrasonic wave was studied.The effects of ultrasonic power,time,pH value of solution,initial concentration of solution and nanometer TiO2 on the degradation of acephate pesticide were investigated.the results indicated that the degradation rate of acephate increased obviously with the increase of ultrasonic power and time.pH values of the solution also exhibited significant influence,both acidity and basicity condition were favor for the degradation.Nano-TiO2 enhanced the degradation of acephate as well.The degradation ratio of acephate pesticide surpassed 85% within 1h under the condition of: ultrasonic frequency of 25 kHz,output power of 60 W/cm2,1.0 g/L Nano-TiO2 catalyst,pH of 2.5,and temperature of 25℃.