Photocatalytic active flowerlike Bi 2 Fe 4 O 9 was synthesized by a hydrothermal method. Scanning (SEM) and transmission electron microscopy (TEM) images revealed that the photocatalysts are composed of well-crystallized nanoplates along the (100) plane. The as-prepared nano-Bi 2 Fe 4 O 9 exhibited excellent photocatalytic oxidation of phenol and aqueous ammonia under visible light irradiation. Much enhanced photocatalytic performance for phenol oxidation was observed with the assistance of a small amount of H 2 O 2 . For guiding the further improvement of its photocatalytic activity, the relationship between the electronic structure and the photocatalytic performance of Bi 2 Fe 4 O 9 is revealed by ab initio calculations for the first time. The calculation results indicate Bi 2 Fe 4 O 9 is a multiband semiconductor, and the principle for an improved photocatalytic performance is to increase the efficiency of electron−hole separation considering the middle energy band that may act as electron−hole recombination centers.
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Sun et al. (2009) studied this question.
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