TS-1分子筛光催化氧化降解氧化乐果

Photocatalytic oxidation degradation of omethoate by using TS-1 zeolite

以TS-1分子筛为光催化剂,H2O2为氧化剂,紫外灯为光源,对农药氧化乐果进行光催化氧化降解研究。详细考察了催化剂添加质量浓度,H2O2添加体积分数和光照时间对氧化乐果降解率的影响。实验结果表明,TS-1分子筛催化剂对氧化乐果具有很好的催化降解活性。氧化乐果可以降解为CO2,NH3,SO42-,PO43-等。最佳反应条件:催化剂质量浓度5 g/L,H2O2体积分数30 mL/L,光照时间90 min,氧化乐果降解率高达96%。此反应为一级动力学反应。三次再生后,TS-1分子筛对氧化乐果的光催化活性没有明显降低。

Photocatalytic oxidation of omethoate with H2O2 was studied with Ti-containing zeolite （TS-1） as photocatalyst under ultraviolet lamp irradiation. The effects of photocatalyst adding mass concentration, H2O2 adding volume fraction and radiation time on the degradation rate of omethoate were investigated. The results show that TS-1 exhibits very good photocatalytic degradation activity to omethoate. Omethoate can be photo-oxidized to CO2, NH3, SO4^2- , PO4^3-. The optimum conditions are the photocatalyst mass concentration of 5 g/L, H2O2 volume fraction of 30 mL/L and an irradiation time of 90 min. Under these conditions, the degradation rate of omethoate is up to 96%. The photocatalytic oxidation of omethoate is first-order kinetic reaction. The activity of photocatalyst is not decreased obviously after being reused three times.