Highly improved visible light photocatalytic activity of BiPO₄ through fabricating a novel p–n heterojunction BiOI/BiPO₄ nanocomposite
2013
Cao, Jing | Xu, Benyan | Lin, Haili | Chen, Shifu
Novel BiOI/BiPO₄ photocatalyst with a p–n heterojunction was fabricated via a facile deposition–precipitation method. The phase structures, morphologies and optical properties of the obtained samples were studied by several characterization tools including XRD, SEM, HRTEM, BET, EDS and UV–Vis DRS. BiOI/BiPO₄ photocatalyst displayed much higher photocatalytic performance for the methyl orange (MO) degradation than the single BiPO₄ and BiOI under visible light (λ>400nm). The best photocatalytic activity of BiOI/BiPO₄ with nearly 98% MO degradation located at molar percentage ratio of 40% after 2h irradiation. Moreover, BiOI/BiPO₄ could also decompose 50% of colorless phenol solution after 8h irradiation. The enhanced photocatalytic performance can be mainly ascribed to the formation of p–n heterojunction interface in BiOI/BiPO₄ which facilitates the transfer and separation of photogenerated electron–hole pairs, as well as the strong visible light absorption originating from the sensitization role of BiOI to BiPO₄.
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