镧掺杂TiO_2降解有机磷农药乐果的研究 |
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引用本文: | 向乾坤,赵秀琴. 镧掺杂TiO_2降解有机磷农药乐果的研究[J]. 安徽农业科学, 2011, 39(35): 21690-21692 |
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作者姓名: | 向乾坤 赵秀琴 |
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作者单位: | 武汉生物工程学院化学与环境工程系,湖北武汉,430415 |
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摘 要: | [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。
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关 键 词: | TiO2 掺杂改性 乐果 降解率 |
Study on Degradation of Organophosphorus Pesticide Dimethoate by La-doped TiO2 |
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Affiliation: | XIANG Qian-kun et al(Department of Chemistry and Environment Engineering,Wuhan Bioengineering Institute,Wuhan,Hubei 430415) |
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Abstract: | [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. |
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Keywords: | TiO2 Doping modification Dimethoate Degradation rate |
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