Abstract
For the first time we report novel BiOCl/Bi 2O 3 photocatalyst functional under visible light irradiation. Even though both the individual BiOCl and Bi 2O 3 show very low photocatalytic efficiency under visible light irradiation, their heterojunctions provide unexpectedly high efficiency in decomposing organic compounds. Furthermore, the BiOCl/Bi 2O 3 can induce complete mineralization without formation of intermediate species by utilizing the holes generated in the VB of BiOCl. Compared to the Degussa P25, it demonstrates 5.7 times of efficiency in evolving CO 2 from gaseous 2-propanol (IP), and 10.5 times of efficiency in removing aqueous 1,4-terephthalic acid (TA) under visible light ( λ ⩾ 420 nm ) irradiation. In this BiOCl/Bi 2O 3 system the BiOCl seems to work as main photocatalyst, while the role of Bi 2O 3 is a sensitizer absorbing visible light. The photocatalytic mechanism has been proposed based on the relative band position of these two semiconductors.
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