镧掺杂TiO_2降解有机磷农药乐果的研究

目的]探讨改性后的TiO2对市售农药乐果的降解率。方法]镧掺杂TiO2光催化降解乐果溶液,用钼酸铵分光光度法测定降解前后乐果溶液的浓度。结果]镧掺杂显著提高了TiO2对乐果的降解率;当催化剂制备时,镧的最佳掺入量为0.15%,最佳煅烧温度为600℃;催化剂光催化降解乐果溶液时,在催化剂投入量为2 g/L、乐果溶液的起始浓度较低、光照时间为4 h时,乐果溶液的降解效率最好。结论]镧掺杂后的TiO2能有效降解低浓度乐果溶液。

Study on Degradation of Organophosphorus Pesticide Dimethoate by La-doped TiO2

Objective] To discuss the degradation of organophosphorous pesticide dimethoate by modified TiO2.Method] Dimethoate solution was photocatalytic degraded by La-doped TiO2,and the concentration of the solution was detected by ammonium molybdate spectrophotometry before and after degradation.Result] Doping of La enhanced TiO2's degradation of dimethoate;during the preparation of catalyst,the best doping amount of La was 0.15%,and the optimal calcination temperature was 600 ℃;during the photocatalytic degradation of dimethoate solution,the catalyst amount was 2 g/L,initial concentration of dimethoate solution was low,the degradation efficiency was the best when illumination time was 4 h.Conclusion] La-doped TiO2 could effectively degrade low concentration of dimethoate solution.