Citation: HUANG Hai-Feng, JIA Jian-Ming, LU Han-Feng, ZHANG Hong-Hua, PAN Lie-Qun. Effect of Designed Zr/Ti Molar Ratio on the Photocatalytic Activity of Sr-Zr-Ti Mixed Oxide Catalysts under Visible Light[J]. Acta Physico-Chimica Sinica, ;2013, 29(06): 1319-1326. doi: 10.3866/PKU.WHXB201304012 shu

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

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 Date: 20 November 2012
Available Online: 1 April 2013
Fund Project: 国家自然科学基金(21107096)资助项目 (21107096)

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 Ti_nO_2n-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.
- Visible light,
- Sr-Zr-Ti mixed oxide,
- Zr/Ti molar ratio,
- Photocatalytic degradation,
- Methylene blue
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