物理化学学报 >> 2008, Vol. 24 >> Issue (04): 633-638.doi: 10.3866/PKU.WHXB20080415

研究论文 上一篇    下一篇

N掺杂纳米TiO2可见光催化氧化丙烯的动力学行为

冯彩霞; 王岩; 金振声; 张顺利   

  1. 河南大学化学化工学院, 河南 开封 475004; 开封大学功能材料研究中心, 河南 开封 475004
  • 收稿日期:2007-08-22 修回日期:2007-12-26 发布日期:2008-04-07
  • 通讯作者: 金振声 E-mail:zhenshengjin@henu.edu.cn

Kinetic Behavior of Visible Light Photocatalytic Oxidation of Propylene for N-Doped Nano-TiO2

FENG Cai-Xia; WANG Yan; JIN Zhen-Sheng; ZHANG Shun-Li   

  1. College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, Henan Province, P. R. China; Functional Material Research Center, Kaifeng University, Kaifeng 475004, Henan Province, P. R. China
  • Received:2007-08-22 Revised:2007-12-26 Published:2008-04-07
  • Contact: JIN Zhen-Sheng E-mail:zhenshengjin@henu.edu.cn

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摘要： 通过在不同温度的氨气气氛中处理纳米管钛酸(NTA)制得具有可见光响应的氮掺杂纳米二氧化钛. X射线衍射(XRD)谱表征结果显示, 当温度高于400 ℃时, 样品由正交晶系向锐钛矿相转变, 700 ℃处理得到的样品除了锐钛矿相TiO2外还有TiN 新相存在; 紫外-可见扩散漫反射(DRS)结果表明, 氮掺杂纳米TiO2在整个可见光区都有明显的吸收. 不同波长可见光及不同气体流速的光催化氧化丙烯动力学研究表明, 活性最好的N掺杂纳米TiO2催化剂(600 ℃ NH3处理)对可见光的利用范围可扩展至500 nm, 低浓度丙烯光催化氧化反应为一级反应.

关键词: 纳米管钛酸, 二氧化钛, N掺杂, 可见光光催化

Abstract: N-doped TiO2 (anatase) with high visible light photocatalytic activity was prepared by treating nanotube titanic acid (NTA) in NH3 flowat different temperatures. The crystalline structure of N-doped TiO2 determined by XRD was anatase when the treating temperature was higher than 400 ℃, however, a newphase (TiN) emerged at 700 ℃. The UV-Vis diffuse reflectance spectra (DRS) display that N-doped TiO2 has a continuous absorption at λ=400 nm. The photocatalytic activity of the N-doped TiO2 was determined by the photocatalytic oxidation of propylene under visible light irradiation. The highest photocatalytic activity was obtained for the catalyst treated at 600 ℃ in NH3 flow, which was active even under λ=500 nm, its kinetic behavior was accordant with the first order reaction formula.

Key words: Nanotube titanic acid, Dioxide titanium, Nitrogen doped, Visible light photocatalysis