高等学校化学学报

高等学校化学学报 ›› 2006, Vol. 27 ›› Issue (5): 797.

• 研究论文 • 上一篇    下一篇

氯化铵对TiO2纳米晶的形成、 结构及性能的影响

李道荣1,2,孙灵娜1,胡长文1   

  1. 1. 北京理工大学理学院化学系, 北京 100081; 2. 河南工业大学化工学院, 郑州 450052
  • 收稿日期:2005-08-30 出版日期:2006-05-10 发布日期:2006-05-10
  • 通讯作者: 胡长文(1955年出生), 男, 博士, 教授， 博士生导师, 主要从事纳米材料研究. E-mail: cwhu@bit.edu.cn
  • 基金资助:

    国家自然科学基金(批准号: 20331010和90406002)和高等学校博士学科点专项基金(批准号： 20030007014)资助.

Influence of NH4Cl on Formation, Structure and Properties of Titania Nanocrystals

LI Dao-Rong1,2, SUN Ling-Na1, HU Chang-Wen1*   

  1. 1. Department of Chemistry, College of Sciences, Beijing Institute of Technology, Beijing 100081;
    2. College of Chemical Engineering, Henan University of Technology, Zhengzhou 450052, China
  • Received:2005-08-30 Online:2006-05-10 Published:2006-05-10
  • Contact: HU Chang-Wen, E-mail: cwhu@bit.edu.cn

PDF (PC)

摘要：

以四氯化钛为原料, 通过氯化铵诱导晶化和热挥发分解法制备了二氧化钛纳米晶, 经粉末XRD, TEM, IR和比表面积及热重分析等手段进行了表征. 通过对粒子生长动力学分析, 在700 ℃以下存在两种生长势, 400 ℃时出现转折, 400 ℃以下粒子生长所需活化能为8.23 kJ/mol; 400 ℃以上粒子生长需活化能为45.71 kJ/mol. 于200 ℃时灼烧样品的表面积最大, 对甲基橙光催化降解活性最高.

关键词: TiO2； 氯化铵； 纳米材料； 粒子生长动力学

Abstract:

TiO2 nanocrystals were synthesized by the method of volatilization and decomposition of TiCl4 in the existence of NH4Cl. The influence of NH4Cl on the structure of crystalline phase and the properties of the sample was discussed. The samples were characterized by XRD, TEM, IR, specific surface areas and thermal analysis. The samples completely changed to anatase phase and are nanocrystals with a diameter less than 7 nm by calcination at 150 ℃ for 5 h; the samples calcined at 300-600 ℃ with the particle diameter about 9-23 nm are composed of pure anatase TiO2; the samples calcined at 700 ℃ with the particle diameter of about 33 nm are composed of a large quantity of anatase phase and a little amount of rutile phase. By dynamics analysis of crystal growth, calcination below 700 ℃, there are two kinds of driving power to crystal growth, and 400 ℃ is the turning point: calcination below 400 ℃ the required energy of crystal growth is 8.23 kJ/mol; calcination at above 400 ℃ the required energy of crystal growth is 45.71 kJ/mol. The catalytic activity of the samples calcined at 200 ℃, which had the largest specific surface area and the particle diameter is about 7 nm, are the highest in the reaction of methyl orange decomposition.

Key words: TiO2; NH4Cl; Nanomaterials; Kinetics of particle growth

中图分类号: 

TrendMD: