纳米TiO_2-UV光催化降解乙酰甲胺磷影响因素的研究

考察了UV-纳米TiO2光催化降解乙酰甲胺磷的可行性,就高压汞灯照射时间及照射方式、催化剂种类及用量、pH值、反应温度、乙酰甲胺磷初始浓度等对光催化降解效率的影响进行了研究,并探索了催化剂的重复利用。结果表明,当添加0.1 g/L的纳米TiO2（德国P25）,乙酰甲胺磷的起始浓度为20 mg/L,温度控制在25℃,反应体系的pH为11时,以高压汞灯持续照射80 min,即可实现对乙酰甲胺磷99.9%的光催化降解。

Photocatalytic degradation of acephate by UV TiO2 process-influence of operating parameters

The photocatalytic degradation feasibility of acephate, an organophosphorous pesticide, by UV TiO2 process was investigated. The effects of radiation mode and duration,TiO2 type and concentration,in- itial aeephate concentration, temperature and initial pH value on the photodegradation efficiency have been examined. The photocatalytic effect was more efficient when the initial acephate concentration was 20 mg/L and in a suspension containing 0. 1 g/L Degussa P25 TiO2, while keeping the reaction solution at 25 ℃ and continuously irradiated for 80 rain to realized the photocatalytic degradation of the aeephate 99.9%. It seems that an alkaline solution （ pH = 11 ） could improve the photodegradation efficiency of acephate.