Journal of Petrochemical Universities

Journal of Petrochemical Universities ›› 2011, Vol. 24 ›› Issue (2): 6-9.DOI: 10.3696/j.issn.1006-396X.2011.02.002

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Phase Transformation of Nano-TiO2 Prepared by Sol-Gel Method

  

  1. School of Chemistry and Materials Science, Liaoning Shihua University, Fushun Liaoning 113001, P.R.China
  • Received:2010-11-30 Revised:2011-03-03 Published:2011-04-25 Online:2011-04-25

溶胶-凝胶法制备氧化钛相变的研究

张静,阎松   

  1. 辽宁石油化工大学化学与材料科学学院,辽宁抚顺113001
  • 作者简介:张静(1980 -), 女, 内蒙古兴安盟乌兰浩特市, 副教授, 博士
  • 基金资助:
    国家自然科学基金青年基金资助(20903054)

Abstract:

TiO2 nanoparticle was prepared by sol-gel method using Ti(OBu)4 as precursor. Phase transformation of TiO2 from anatase to rutile was studied by UV Raman spectroscopy, visible Raman spectroscopy, X-ray diffraction (XRD). The results from visible Raman spectroscopy are in good agreement with those of XRD patterns. It was observed that anatase in the bulk region starts to change into rutile at 600 ℃. However, from UV Raman spectra, the anatase in the surface region transformed into the rutile phase until the calcination temperature was up to 765 ℃. The inconsistency in the results from the above three techniques suggests that the anatase phase of TiO2 at surface region can remain at relatively higher calcination temperatures than that in bulk during the phase transformation. It was suggested that the rutile phase starts to form at the interfaces between the anatase particles of the agglomerated TiO2 particles.
 

Key words:

摘要: 以钛酸四丁酯为前驱物, 用溶胶-凝胶方法制得了纳米氧化钛(TiO2)粒子, 并采用紫外拉曼光谱, 可见拉曼光谱以及XRD 进行表征, 并计算了不同焙烧温度时TiO2 表面和体相的晶相组成, 以此为基础研究了TiO2 的相变机理。XRD 与可见拉曼光谱的结果一致, 均表明体相区锐钛矿在600 ℃时开始向金红石转变。然而紫外拉曼光谱的结果却表明, 焙烧温度高达765 ℃时, 表面区锐钛矿才开始发生相变, 即从锐钛矿到金红石的相变过程中存在体相和表面相变不同步的现象, 金红石相是从相互接触的锐钛矿粒子的界面开始生成的。

关键词: 氧化钛 , 相变 , 溶胶凝胶法

Cite this article

ZHANG Jing, YAN Song. Phase Transformation of Nano-TiO2 Prepared by Sol-Gel Method[J]. Journal of Petrochemical Universities, 2011, 24(2): 6-9.

张静,阎松. 溶胶-凝胶法制备氧化钛相变的研究[J]. 石油化工高等学校学报, 2011, 24(2): 6-9.