Change Tendency of Photocatalytic Activity in System of Perovskite(ABO3) Type Oxide and Analysis

Abstract

Abstract: The perovskite(ABO₃) type oxides have a photocatalytic activity that can be characterized with decolorization of some organic dyes under irradiation of mercury lamp. The experimental results show that the photocatalytic activity of ABO₃ increases with increasing atomic number of atom B(Ti—Co) when A-site atom keeps constant. It is connected with the rise of Allred Rochow electronegativity of atom B, the decrease of ABO₃ energy gap(energy defference between the filled p bands of O^2- and the unoccupied 3 d band of neighboring atom B) and the increase of the third atomic ionizaton potentials of atom B. It has been also proved that the photocatalytic activity of ABO₃ compounds increases with increasing χ_ARof atom A(Ca, Cd, Pb).

Key words: Perovskite type oxide, Photocatalytic activity, Allred-Rochow electronegativity, Energy gap

CLC Number:

O643.36

TrendMD:

BAI Shu-Lin, FU Xi-Xian, SANG Li-Xia, YANG Qiu-Hua, WANG Jun-Zhen, ZENG Shu-Lan . Change Tendency of Photocatalytic Activity in System of Perovskite(ABO₃) Type Oxide and Analysis[J]. Chem. J. Chinese Universities, 2001, 22(4): 663.

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Change Tendency of Photocatalytic Activity in System of Perovskite(ABO₃) Type Oxide and Analysis

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