物理化学学报 >> 2003, Vol. 19 >> Issue (08): 733-736.doi: 10.3866/PKU.WHXB20030812

研究论文 上一篇    下一篇

纳米(NH4)3PMo6W6O40的室温固相合成及形成机理

周立群;柳士忠;余国锋;孙聚堂   

  1. 湖北大学化学与材料科学学院，武汉　430062； 1孝感学院化学系，孝感　432100；
  • 收稿日期:2003-01-21 修回日期:2003-04-02 发布日期:2003-08-15
  • 通讯作者: 柳士忠 E-mail:lisz@publiic.wh.hb.cn

Preparation and Formation Mechanism of the (NH4)3PMo6W6O40 Nanoparticles by Solid State Reaction at Room Temperature

Zhou Li-Qun;Liu Shi-Zhong;Yu Guo-Feng;Sun Ju-Tang   

  1. Faculty of Chemistry and Material Science, Hubei University, Wuhan　430062; 1Department of Chemistry, Xiaogan College, Xiaogan　432100; 2College of Chemistry and Molecular Science, Wuhan University, Wuhan　430072
  • Received:2003-01-21 Revised:2003-04-02 Published:2003-08-15
  • Contact: Liu Shi-Zhong E-mail:lisz@publiic.wh.hb.cn

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摘要： 以H3PMo6W6O40•23H2O和(NH4)2C2O4•H2O为原料，采用室温固相反应合成出(NH4)3PMo6W6O40•6H2O产物，用元素分析、IR、UV-Vis、XRD、TEM、TG-DTA、BET等手段确定其组成、结构和性能.结果表明，产物为纳米粒子，平均粒径为10 nm.纳米粒子保持着杂多阴离子的Keggin特征结构，比表面积为167.6 m2•g－1，且在465 ℃以下具有良好的热稳定性.反应中反应热能、结晶水和生成物H2C2O4•2H2O对形成小粒径的(NH4)3PMo6W6O40纳米粒子起关键作用.

关键词: (NH4)3PMo6W6O40, 纳米粒子, 室温固相反应, 机理

Abstract: (NH4)3PMo6W6O40 nanoparticles were synthesized by the solid state reaction of H3PMo6W6O40•23H2O with (NH4)2C2O4•H2O at room temperature. Its structure, particle size and appearance were characterized with elemental analysis, IR, UV-Vis, XRD, TEM, TG-DTA and BET techniques. The results show that (NH4)3PMo6W6O40 nanoparticles are found to exhibit Keggin structure, have a surface area of 167.6 m2•g－1, below 465 ℃, the nanoparticles have a higher thermal stability, the mean grain size is of the value of 10 nm. In this solid state reaction, grinding and reaction thermal energy can accelerate the speed of reactant diffusion and product nucleation and decrease the particle′s size, water of crystallization of reactants and product H2C2O4•2H2O play a key role of forming the small size (NH4)3PMo6W6O40 nanoparticles.

Key words: (NH4)3PMo6W6O40, Nanoparticles, Solid state reaction at room temperature, Mechanism