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›› 2007, Vol. 7 ›› Issue (3): 556-560.

• 过程与工艺 • 上一篇    下一篇

pH值对溶胶-凝胶法制备纳米TiO2的影响

周利民,王一平,黄群武   

  1. 东华理工大学应用化学系
  • 出版日期:2007-06-20 发布日期:2007-06-20

The Effect of pH Value on Preparation of TiO2 Nanoparticles with Sol-Gel Method

ZHOU Li-min,WANG Yi-ping,HUANG Qun-wu   

  1. Department of Applied Chemistry, East China Institute of Technology Fuzhou
  • Online:2007-06-20 Published:2007-06-20

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摘要： 利用溶胶-凝胶法制备了纳米TiO2颗粒，采用透射电镜(TEM)和X射线衍射(XRD)对产物进行了表征，考察了Ti4+-三乙醇胺(Ti-TEOA)络合体系组成随陈化时间的变化及pH对TiO2粒径、结晶习性、产率及Ti-TEOA稳定性的影响. 结果表明，产物为锐钛型TiO2，140℃陈化时，Ti(OH)4凝胶在10 h后全部转化为TiO2颗粒，平均粒径5~22 nm；随pH升高，粒径增大，但TiO2产率在pH>10.6时显著下降，至pH 12时无TiO2颗粒生成；不同pH时TiO2结晶习性变化明显. 25℃下pH>6时Ti-TEOA络合体系稳定.

关键词: 溶胶-凝胶法, 纳米TiO2, pH, 结晶习性

Abstract: TiO2 nanoparticles were prepared with sol-gel method and characterized by transmission electron microscope (TEM) and X-ray diffraction (XRD). The composition changes of Ti4+-triethanolamine (Ti-TEOA) complex system with aging time and the effect of pH value on particles size, crystallization habit and yield of TiO2, and the stability of Ti-TEOA were investigated. The results showed that the synthesized product was anatase TiO2. Ti(OH)4 gel was totally converted into TiO2 after 10 h of aging at 140℃. The mean diameter of TiO2 particles was 5~22 nm and increased with increasing pH. However, the yield of TiO2 decreased dramatically at pH>10.6 and no TiO2 particles were found at pH 12. The crystallization habit of TiO2 was greatly changed with different pH values. Ti-TEOA complex system was stable at pH>6 and 25℃.

Key words: sol-gel method, TiO2 nanoparticles, pH, crystallization habit