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P-n junction BiVO"4/Ag"2O heterogeneous nanostructures with enhanced visible-light photocatalytic properties of BiVO"4 nanocrystals have been successfully prepared by coupling a hydrothermal process with monoacid strategy. A large number of nano p-n junction heterostructures assembled by p-type Ag"2O nanoparticles formed on the surface of BiVO"4 nanocrystals, where Ag"2O and BiVO"4 form p- and n-type semiconductors, respectively. The experimental results showed that the samples are monoclinic phases and have decahedral morphology, so that efficient charge separation can be achieved on different crystal facets. The CH"3COO^- can largely reduce the interface energy of BiVO"4 to decrease the agglomeration phenomena. In addition, the p-n junction BiVO"4/Ag"2O heterogeneous nanostructures have much higher photocatalytic activities than the pure BiVO"4 nanocrystals for the degradation of methyl orange (MO) under visible light irradiation. The enhanced photocatalytic activity owed to the effective charge transfer from different crystal facets and p-type Ag"2O to the attached n-type BiVO"4 nanoparticles.
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