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无机材料学报

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热处理及气氛对纳米二氧化钛可见光催化活性影响研究

周武艺1, 唐绍裘2, 卫泽斌3, 徐悦华1, 卢其明1

  

  1. (1. 华南农业大学 理学院应用化学系, 广州 510642; 2. 湖南大学 材料科学与工程学院, 长沙 410082; 3. 华南农业大学 资源与环境学院, 广州 510642)

  • 收稿日期:2006-12-31 修回日期:2007-04-24 出版日期:2008-01-20 网络出版日期:2008-01-20

Effects of Heat Treatment and Atmosphere on the Visible Light Photocatalytic Activity of Nano-TiO2

  • ZHOU Wu-Yi1, TANG Shao-Qiu2, Wei Ze-Bin3, XU Yue-Hua1, LU Qi-Ming1
  

  1. (1. Department of Applied Chemistry. College of Science, South-China Agricultural University. Guangzhou 510642, China; 2. College of Materials Science and Engineering, Hunan University, Changsha 410082, China; 3. College of Resource and Environment, South China Agricultural University, Guangzhou 510642, China)
  • Received:2006-12-31 Revised:2007-04-24 Published:2008-01-20 Online:2008-01-20

PDF (PC)

1891

被引次数

28 | 3

摘要： 通过XRD、TEM、DRS、XPS等技术研究了纳米TiO2粉末在不同气氛中进行热处理的晶体结构, 形貌及价态分布等. 结果表明, 在氮气中较低温度(400℃)热处理后发生了由锐钛矿向金红石的转变, 颗粒分布均匀, 并且由于部分N原子进入表面的TiO2晶格中取代了部分O原子产生氧缺陷, 从而成为光活性中心, 致使吸收光子的数量增多, 带隙变宽, 并向可见光区方向移动. 光催化降解亚甲基蓝溶液实验也表明在氮气中热处理较大提高了纳米TiO2粉末可见光光催化活性.

关键词: 纳米二氧化钛, 热处理, 气氛, 可见光催化

Abstract: The nano-TiO2 powders were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), diffuse reflectance spectra (DRS) and X-ray photoelectron spectroscope (XPS). The results show that nano-TiO2 is transformed to rutile crystal after treating at 400℃ in N2 atmosphere and the nano-TiO2 particles obtained are uniform. Part N atoms are intruded into the TiO2 crystals and substituted for some of O atoms, which produce oxygen defects. Those oxygen defects become the center of photo activity, which result in the increase of absorbed photons and the formation of broad band gap and make the absorption spectrum move to the visible light. The photocatalytic degradation of methylene blue shows that the visible light catalytic activity of nano-TiO2 calcined in N2 atmosphere is improved.


Key words: nano-TiO2, heat treatment, atmosphere, visible-light catalytic

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