无机材料学报 ›› 2010, Vol. 25 ›› Issue (8): 815-819.DOI: 10.3724/SP.J.1077.2010.00815 CSTR: 32189.14.SP.J.1077.2010.00815

• 研究论文 • 上一篇    下一篇

微波辅助低温制备纳米TiO2晶体生长动力学研究

冯 炜1, 邹克华2, 翟增秀2   

  1. (1. 天津大学 化工学院 天津300072; 2. 天津市环境保护科学研究院 国家环境保护恶臭污染控制重点实验室, 天津300191)
  • 收稿日期:2009-11-20 修回日期:2010-02-05 出版日期:2010-08-20 网络出版日期:2010-07-19
  • 基金资助:

    国家水体污染控制与治理科技重大专项资助项目(2008X07314-001-12)

Study on the Crystal Growth Kinetics of Nano TiO2 Prepared with Microwave Aid at Low Temperature

FENG Wei1, ZOU Ke-Hua2, ZHAI Zen-Xiu2   

  1. (1. School of Chemical Engineering and Technology, Tianjing University, Tianjin 300072, China, 2. State Envtronmental Protection Key Laboratory of Odor Pollution Control, Tianjin 300191, China)
  • Received:2009-11-20 Revised:2010-02-05 Published:2010-08-20 Online:2010-07-19

摘要:

采用一次微波辅助促进水解, 水浴陈化或二次微波辐射促进晶化的热处理方法, 在较低温度下制得纳米TiO2晶体颗粒, 样品表征结果证明为单一锐钛矿晶型, 且具有球形或短柱型形貌特征. 晶体生长宏观动力学研究显示, 二次微波辐射下纳米TiO2晶体生长规律可描述为2次方程, 表观生长活化能为59.47 kJ/mol, 而水浴陈化方式下晶体生长则可描述为3次方方程, 表观生长活化能为19.44 kJ/mol, 因此二次微波辐射方法制备纳米TiO2晶体具有更大的表观生长活化能和独特的动力学性质.

关键词: 微波, 纳米TiO2晶体, 晶体生长, 动力学

Abstract:

The TiO2 nanocrystal particles were prepared by low-temperature method. Firstly, hydrolysis of reactants was promoted with microwave radiation aid, then crystallization could be facilitated through the process of the second microwave radiation or aging in water bath. The characterization results show that the shape of TiO2 nanocrystal is sphere or short column, which are all in pure anatase phase. The kinetic studies indicate that the anatase TiO2 growth can be described as the twice order kinetic equation and the apparent activity energy is 59.47 kJ/mol with two-step microwave radiation, while the kinetic equation is conformed to the third order and the apparent activity energy is 19.44 kJ/mol with ageing process. The above comparison proves that the nanocrystal TiO2 would grow faster in short time with the two-step microwave radiation at low temperature.

Key words: microwave, TiO2 nanocrystal, crystal growth, study of kinetics

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