物理化学学报 >> 2013, Vol. 29 >> Issue (06): 1319-1326.doi: 10.3866/PKU.WHXB201304012

催化和表面科学 上一篇    下一篇

Zr/Ti摩尔比对锶锆钛复合氧化物在可见光下光催化性能的影响

黄海凤1, 贾建明1, 卢晗锋2, 张宏华1, 潘烈群3   

  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与材料科学学院, 催化反应工程研究所, 杭州 310014;
    3 富阳市环境保护监测站, 浙江 富阳 311400
  • 收稿日期:2012-11-20 修回日期:2013-04-01 发布日期:2013-05-17
  • 通讯作者: 卢晗锋 E-mail:luhf@zjut.edu.cn
  • 基金资助:

    国家自然科学基金(21107096)资助项目

Effect of Designed Zr/Ti Molar Ratio on the Photocatalytic Activity of Sr-Zr-Ti Mixed Oxide Catalysts under Visible Light

HUANG Hai-Feng1, JIA Jian-Ming1, LU Han-Feng2, ZHANG Hong-Hua1, PAN Lie-Qun3   

  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 and Materials Science, Zhejiang University of Technology, Hangzhou 310014, P. R. China;
    3 Environmental Monitoring Station of Fuyang City, Fuyang 311400, Zhejiang Province, P. R. China
  • Received:2012-11-20 Revised:2013-04-01 Published:2013-05-17
  • Supported by:

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

摘要:

通过分步沉积法制备了不同Zr/Ti 摩尔比的锶锆钛(SZT)复合氧化物催化剂, 以X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、紫外-可见(UV-Vis)漫反射光谱等表征手段考察不同Zr/Ti 摩尔比下SZT催化剂的结构形态, 以可见光下光催化降解亚甲基蓝为模型反应考察样品的光催化活性. 结果表明: Zr/Ti 摩尔比<1 时SZT催化剂发生Zr4+与Ti4+同质替换, 引起晶格缺陷, 光催化活性小幅提高; Zr/Ti 摩尔比≥1 时SZT催化剂产生SrZrO3/TinO2n-1 (n=4, 9)的新晶相, TinO2n-1 (n=4, 9)的存在有利于光生电子-空穴的传导与分离, 可大幅提高催化剂光催化活性. 其中, SZT-5/5 表现出最高的光催化活性, 其一级反应速率常数达到0.2133 min-1, 是同等光照条件下纯SrTiO3样品(0.0158 min-1)的13.5倍.

关键词: 可见光, 锶锆钛复合氧化物, Zr/Ti 摩尔比, 光催化降解, 亚甲基蓝

Abstract:

A series of Sr-Zr-Ti (SZT) mixed oxide catalysts were prepared by a fractional-precipitation method. These photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and ultraviolet visible (UV-Vis) diffuse reflectance absorption spectra. Photocatalytic degradation of methylene blue was investigated to determine the photoactivity of the catalyst. It was shown that with a Zr/Ti ratio<1, the SZT mixed oxide catalysts showed improved photocatalytic activity. This was attributed to lattice defects creating active photocatalytic sites because of Zr4+ doping. For Zr/Ti ratios ≥1, the catalysts showed markedly improved photocatalytic activity because of new crystalline phases of SrZrO3 and TinO2n-1 (n=4, 9)that facilitated splitting and conduction for electron/hole. Typical SZT samples (Zr/Ti=4) showed the highest photocatalytic activity, with first-order reaction rate constant 13.5 times that of a SrTiO3 sample.

Key words: Visible light, Sr-Zr-Ti mixed oxide, Zr/Ti molar ratio, Photocatalytic degradation, Methylene blue

MSC2000: 

  • O644