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›› 2009, Vol. 9 ›› Issue (6): 1115-1120.

• 过程与工艺 • 上一篇    下一篇

掺铁纳米TiO2光催化降解乐果的实验研究

傅敏 王建伟 吴四维 高堃   

  1. 重庆工商大学环境与生物工程学院 重庆工商大学环境与生物工程学院 重庆工商大学环境与生物工程学院 重庆工商大学环境与生物工程学院
  • 收稿日期:2009-03-16 修回日期:2009-06-22 出版日期:2009-12-20 发布日期:2009-12-20
  • 通讯作者: 傅敏

Photocatalytic Degradation of Omethoate with Iron Doped Nanometer TiO2

FU Min WANG Jian-wei GAO Kun, WU Si-wei   

  1. College of Environmental and Biology Engineering Chongqing Technology and Business Universit College of Environmental and Biology Engineering Chongqing Technology and Business Universit College of Environmental and Biology Engineering Chongqing Technology and Business Universit College of Environmental and Biology Engineering Chongqing Technology and Business Universit
  • Received:2009-03-16 Revised:2009-06-22 Online:2009-12-20 Published:2009-12-20
  • Contact: FU Min

摘要: 以钛酸四丁酯[CH3(CH2)3O]4Ti]为钛源,硝酸铁[Fe(NO3)3×9H2O]为改性剂,采用溶胶-凝胶法合成了掺铁纳米TiO2催化剂. 纳米TiO2的最佳掺铁量为0.05%,最佳煅烧温度为500℃. 采用X射线衍射、热重-差热、紫外-可见光谱对其结构进行了表征. 结果表明,500℃时煅烧的掺铁0.05%的TiO2为锐钛矿型,晶粒粒径为17.5 nm,其光谱吸收边带发生了红移,吸收强度增大. 对50 mg/L氧化乐果溶液的光催化降解实验表明,当光催化剂的最佳用量为0.2 g/L、溶液pH为8.6时,250 W高压汞灯照射2.5 h,乐果的降解率达到了85.23%,降解反应符合一级动力学方程.

关键词: 光催化, 二氧化钛, 铁掺杂, 乐果

Abstract: Titanium dioxide sol was synthesized by sol-gel method with adulteration of Fe(NO3)3×9H2O. The samples were characterized by XRD, DTA-TG and UV-Vis. The results show that the diameter of particles is 17.5 nm and pure anatase. From the UV-Vis spectra the absorption edge of iron-doped titania has a red shift and the absorption intensities are increased. The degradation rate of omethoate reaches 85.23% when the dosage of photocatalyst is optimally 0.2 g/L, pH=8.6 and 2.5 h illumination with high-voltage mercury lamp. The photocatalytic degradation kinetics follows the pseudo-first order reaction.

Key words: photocatalysis, TiO2, iron doped, omethoate

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