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化学学报
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化学学报 ›› 2009, Vol. 67 ›› Issue (6): 507-512. 上一篇    下一篇

研究论文

微量铂掺杂对TiO2粉末结构和性能的影响

刘秀华* 吴仲成 赵雅文 杨宇川 傅依备

  

  1. (中国工程物理研究院 绵阳 621900)

  • 投稿日期:2008-03-04 修回日期:2008-07-30 发布日期:2009-03-28
  • 通讯作者: 刘秀华

The Effects of Doping Micro Platinum on the Structures and Performances of TiO2 Powders

Liu, Xiuhua* Wu, Zhongcheng Zhao, Yawen Yang, Yuchuan Fu, Yibei   

  1. (China Academy of Engineering Physics, Mianyang 621900)
  • Received:2008-03-04 Revised:2008-07-30 Published:2009-03-28
  • Contact: Liu, Xiuhua

PDF

2237

被引次数

59

采用溶胶-凝胶法制备了铂掺杂的TiO2粉末, 利用透射电子显微镜、X射线光电子能谱、紫外可见光谱和X射线衍射技术对粉末的结构和光吸收性能进行了表征. 结果表明, Pt/TiO2粉末主要含有Ti, O, Pt和C元素, 其中Pt主要以0价态存在. 573～873 K焙烧的Pt/TiO2粉末中, TiO2是锐钛矿结构, 973 K焙烧时, 有6.3%的TiO2转变为金红石结构. Pt/TiO2粉末的晶粒尺寸小, 铂和锐钛矿结构TiO2粒子都是纳米颗粒. 随焙烧温度升高, 粉末中TiO2的晶粒尺寸逐渐增大, 晶格常数a和c发生各向异性的变化, 单胞体积在相变时发生收缩. 与TiO2粉末相比, Pt/TiO2粉末中两种结构TiO2的晶格常数和晶胞体积基本上都增大了, 光谱吸收范围被明显拓展至可见光, 实现了可见光催化的基础.

关键词: 铂, 二氧化钛, 粉末, 表征

The Pt-doped TiO2 powder was prepared by the sol-gel method, and its structure and light absorption performance were characterized by transmission electron microscopy, X-ray photoelectron spectroscopy, UV-Vis absorption spectroscopy and X-ray diffraction. The results showed that there were Ti, O, Pt and C elements in the Pt/TiO2 powder, and Pt mainly existed in a metallic state. When calcined between 573 and 873 K, TiO2 in Pt/TiO2 powder took an anatase structure. When calcined at 973 K, 6.3% TiO2 was transformed into rutile structure. The grain size of Pt/TiO2 powder was small. Pt and anatase TiO2 particles were all nanometer particles. With increasing the calcination temperatures, the grain size of TiO2 in Pt/TiO2 powder increased gradually, and the changing of crystal lattice constants a and c differed in different directions. Cell volume was contracted during phase transition. The crystal lattice constant and cell volume of TiO2 with both structures in Pt/TiO2 powders become bigger than those in TiO2 powders. After platinum doping, the photon excited wavelength of TiO2 powder was broadened to visible light region. The basis of visible photocatalysis was realized.

Key words: platinum, titanium dioxide, powder, characterization