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

doi:10.3866/PKU.WHXB201304012

Abstract

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 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.

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

MSC2000:

O644

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 Phys. -Chim. Sin., 2013, 29(06): 1319-1326.

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

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