A novel visible-light-active BiOCl/BiVO 4 photocatalyst with a p–n heterojunction structure was prepared using a hydrothermal method. The photocatalytic activity of the heterojunction was investigated by monitoring the change in methyl orange (MO) concentration under visible-light irradiation. The results reveal that the composite exhibited markedly improved efficiency for MO photodegradation in comparison with pure BiVO 4, BiOCl, and Degussa P25. This is ascribed to the B-type heterojunction structure with a strong oxidative ability and efficient charge separation and transfer across the BiOCl/BiVO 4 p–n junction. The highest activity was obtained in the BiOCl/BiVO 4 heterojunction using a composite of 13 mol % BiOCl and 87 mol % BiVO 4 . The removal of MO was mainly initiated by valence-band holes, but dissolved oxygen also played a crucial role in consuming the conduction-band electrons. This was verified by the effects of scavengers and N 2 purging.
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He et al. (2013) studied this question.
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