光催化降解敌百虫农药废水的影响因素分析

Analysis of factors influencing the photocatalytic degradation of trichlorfon

在TiO2悬浮体系,对农用敌百虫有机磷农药进行光催化氧化降解反应。发现光催化降解过程中适当补充NaOH溶液,可以维持较高的有机磷降解率,对于处理有机磷农药废水保持一定的pH值有作用。 敌百虫农药有机磷含量起始浓度处于3.1 mg·L-1和31 mg·L-1之间,在50 mg的催化剂TiO2作用下90 min内无机磷浓度变化符合零级反应,而且反应速率常数和敌百虫起始浓度呈线形关系,实验中探讨了降解过程中出现的影响因素。

The photocatalytic degradation of trichlorfon in aqueous TiO2 dispersions was investigated. The result shows addition of NaOH can promote the photocatalytic degradation of trichlorfon and it can keep the pH value on the photocatalytic degradation of organic phosphorus pesticides. When the initial concentration of organic phosphorus of trichlorfon is between 3.1 mg稬-1 and 31 mg稬-1, the change of inorganic phosphor fit zero order kinetic law on the effect of 50 mg TiO2 within 90 minutes. It shows the linear relationship between the rate constants and the initial concentration of trichlorfon. Finally, this paper discusses the influence factors on the photocatalytic degradation of trichlorfon.