Oxygen Migration and Photocatalystic Activity of Pervoskite-type Oxides

Abstract

Abstract: The degradation experiments of water-soluble dye were carried out in the suspension systems of pervoskite-type oxides LaBO₃(B=Fe, Co) prepared by citrate method, and the results show that photocatalytic activity is related with the mechanism of oxygen vacancies migration in the pervoskite-type structure which takes place along the anion octahedron edge, although not in linear fashion but via a curved path, resulting in a significantly lower energy barrier. In the photocatalytic oxidation reaction, electrons are trapped by oxygen vacancies at or near the surface and then form superoxide with adsorbed oxygen, which can make dye degrade rapidly. Oxygen vacancies in the pervoskite-type structure produced by oxygen migration act as electron traps and accordingly increase the amount of the absorbed oxygen on the surface.

Key words: Pervoskite-type oxides, Oxygen vacancy, Oxygen migration, Dye degradation, Photocatalystic oxidation

CLC Number:

O643.36

TrendMD:

SANG Li-Xia, ZHONG Shun-He, FU Xi-Xian . Oxygen Migration and Photocatalystic Activity of Pervoskite-type Oxides[J]. Chem. J. Chinese Universities, 2003, 24(2): 320.

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Oxygen Migration and Photocatalystic Activity of Pervoskite-type Oxides

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