β-Bi2O3修饰Bi2WO6光催化降解苯酚及其可能机理

doi:10.3866/PKU.WHXB201501131

Abstract

Abstract:

In this study, a series of Bi₂O₃-containing Bi₂WO₆ catalysts were prepared by a simple mixing method. We used the oxidation of phenol in water under UV light as a model reaction, and found that as the amount of Bi₂O₃ in the mixture increased, its photocatalytic activity increased, and then started to decrease. A maximum activity was observed with the catalyst containing 12.5% (mass fraction, w) of Bi₂O₃, about 4 times that of Bi₂WO₆. Solid characterization revealed that the composite was a mixture of β-Bi₂O₃ and Bi₂WO₆. The water oxidation photocurrent over the β-Bi₂O₃/Bi₂WO₆ thin film electrode was much larger than the sum of the photocurrents of the β-Bi₂O₃ and Bi₂WO₆ thin film electrodes. It is proposed that there is a valence hole transfer from Bi₂WO₆ to β-Bi₂O₃, which improves the charge separation efficiency, and consequently increases the rate of phenol degradation.

Key words: Bismuth oxide, Bismuth tungstate, Photocatalysis, Charge transfer, Organic degradation

LI Xiao-Jin, SHENG Jia-Yi, CHEN Hai-Hang, XU Yi-Ming. Improved Photocatalytic Degradation of Phenol over β-Bi₂O₃ Modified Bi₂WO₆ and Possible Mechanism[J].Acta Phys. -Chim. Sin., 2015, 31(3): 540-544.

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Improved Photocatalytic Degradation of Phenol over β-Bi₂O₃ Modified Bi₂WO₆ and Possible Mechanism

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Improved Photocatalytic Degradation of Phenol over β-Bi₂O₃ Modified Bi₂WO₆ and Possible Mechanism