物理化学学报 >> 2015, Vol. 31 >> Issue (7): 1399-1405.doi: 10.3866/PKU.WHXB201505191

催化和表面科学 上一篇    下一篇

可见光下高催化活性不同结构Sr/TiO2催化剂的制备和表征

蒋孝佳1, 贾建明1, 卢晗锋2, 朱秋莲2, 黄海凤1   

  1. 1 浙江工业大学生物与环境工程学院, 杭州310014;
    2 浙江工业大学化学工程学院, 催化反应工程研究所, 杭州310014
  • 收稿日期:2015-03-24 修回日期:2015-05-18 发布日期:2015-07-08
  • 通讯作者: 黄海凤 E-mail:hhf66@zjut.edu.cn
  • 基金资助:

    国家自然科学基金(21107096)资助项目

Preparation and Characterization of Sr/TiO2 Catalysts with Different Structures and High Photocatalytic Activity under Visible Light

JIANG Xiao-Jia1, JIA Jian-Ming1, LU Han-Feng2, ZHU Qiu-Lian2, HUANG Hai-Feng1   

  1. 1 College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China;
    2 Research Institute of Catalytic Reaction Engineering, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China
  • Received:2015-03-24 Revised:2015-05-18 Published:2015-07-08
  • Contact: HUANG Hai-Feng E-mail:hhf66@zjut.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21107096).

摘要:

采用分步沉积法制备不同Sr/Ti 摩尔比例的Sr/TiO2催化剂, 以X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、傅里叶变换红外(FT-IR) 光谱、紫外-可见漫反射光谱(UV-Vis RDS)等手段对样品进行了表征, 以可见光催化降解亚甲基蓝为模型反应考察样品光催化活性. 结果表明, 催化剂的活性和结构随Sr/Ti 摩尔比(n(Sr)/n(Ti))的变化而变化, 当n(Sr)/n(Ti)≤3/2 时, 催化剂呈由TiO2和SrTiO3组成的球状结构; 而当n(Sr)/n(Ti)在3/2 与4/1 之间时, 催化剂呈片状结构, 且随着n(Sr)/n(Ti)增大, 催化剂组成由SrTiO3 和Sr24 变为Sr24和Sr(OH)2·H2O; 当n(Sr)/n(Ti)=9/1 时, 催化剂呈以Sr(OH)2·H2O为主的针状结构. 其中, n(Sr)/n(Ti)=4/1的样品表现出最高的光催化活性, 一级反应速率为SrTiO3钙钛矿催化剂的5.0倍, 商用P25的86.7倍.

关键词: Sr/Ti 摩尔比例, 不同结构, 光催化, 亚甲基蓝, 可见光

Abstract:

Sr/TiO2 catalysts with different Sr/Ti molar ratios (n(Sr)/n(Ti)) were synthesized by fractional precipitation. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectrometry, and ultraviolet-visible diffuse reflectance spectrophotometry (UV-Vis RDS). The photocatalytic activity of the samples under visible light was determined using the photocatalytic degradation of methylene blue. The photocatalytic activities and structures of the catalysts changed with n(Sr)/n(Ti) molar ratio. When n(Sr)/n(Ti)≤3/2, the catalysts, which were composed of TiO2 and SrTiO3, showed a globular structure. When n(Sr)/n(Ti) was between 3/2 and 4/1, the catalysts had a flaky structure. As the n(Sr)/n(Ti) increased, the composition of the catalysts changed from SrTiO3 and Sr24 to Sr24 and Sr(OH)2·H2O. When the n(Sr)/n(Ti) ratio was 9/1, the catalyst mainly consisted of Sr(OH)2 ·H2O and exhibited an acicular structure. The sample with n(Sr)/n(Ti)=4/1 exhibited the highest photocatalytic activity; its first-order reaction rate constant was 5.0 times as high as that of the perovskite catalyst SrTiO3 and 86.7 times as high as that of the commercial Ti photocatalyst P25.

Key words: Sr/Ti molar ratio, Different structure, Photocatalysis, Methylene blue, Visible light

MSC2000: 

  • O644