高级检索
无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

BaTinO2n+1光催化性能和结构关系的研究

邢精成1,2, 王文邓1, 卞建江2, 杨建华1, 黄富强1   

  1. 1. 中国科学院 上海硅酸盐研究所, 上海 200050; 2. 上海大学 材料科学与工程学院, 上海 200072
  • 收稿日期:2006-10-26 修回日期:2006-12-05 出版日期:2007-11-20 网络出版日期:2007-11-20

Structure-dependent Photocatalytic Activities of BaTinO2n+1 (n=1, 2 and 4)

XING Jing-Cheng1,2, WANG Wen-Deng1, BIAN Jian-Jiang2, YANG Jian-Hua1, HUANG Fu-Qiang1   

  1. 1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; 2. Department of Material Science and Technology, Shanghai University, Shanghai 210009, China
  • Received:2006-10-26 Revised:2006-12-05 Published:2007-11-20 Online:2007-11-20

PDF (PC)

2013

摘要： 光催化剂BaTinO2n+1(n=1, 2和4)粉末是通过sol-gel法制得的聚合物前驱体在800℃下烧制而成. 利用XRD粉末衍射和UV-Vis吸收光谱表征样品的物相和吸收光谱特性. 在样品的光催化活性测试中, 采取甲基橙作为染料光降解的模型, 研究了BaTiO3、BaTi2O5和BaTi4O9在各种酸性条件下对甲基橙溶液的降解效率, 并初步探讨了其光催化性能差异的影响机制. 实验表明, 在相同的酸性条件下, 三种钛酸钡BaTinO2 n+1(n=1, 2和4)的光催化活性都随n的增大而增强, 即BaTiO32O54O9. 引入堆积率(定义为单位晶胞内所有组成离子的体积占整个晶胞体积的百分比)的概念, 堆积率越小, 则表明材料晶体结构越开放. 利用结构开放度的概念模型可以很好地解释光催化活性的差异, 即在这三种材料中, 结构越开放, 光催化性能越好.

关键词: BaTinO2 n+1 (n=1, 2 和4), 光催化, 甲基橙, Sol-Gel, pH值

Abstract: The BaTiO3, BaTi2O5 and BaTi4O9 photocatalysts were prepared by a sol-gel method calcined at 800℃. The prepared powders were characterized by X-ray powder diffraction and UV-Vis absorbance spectra. Their UVinduced photocatalytic activities were evaluated on the degradation of methyl orange at different pH values. The results show that the photocatalytic activities of BaTinO2n+1 are improved as n increases from 1 to 2 and 4. The crystal packing factor (P.F.) is introduced to explain this phenomenon, in which P.F. is defined as the proportion of the total volume of all the ions in a cell to the volume of a cell. The smaller the P.F. is, the looser-packing the structure has, the better photocatalytic activity will be achieved. The experimental fact that BaTi4O9 has the best photocatalytic performance among the three compounds is ascribed to its highest structure-openness degree.

Key words: BaTinO2 n+1 (n=1, 2 and 4), photocatalytic, methyl orange, sol-gel, pH value

中图分类号: