[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.%[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4h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.
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