Interlayer-I-doped BiOIO3 nanoplates with an optimized electronic structure for efficient visible light photocatalysis

Abstract

The success in the synthesis of Bi-based layered photocatalysts with high photocatalytic activities has triggered intensive studies. Herein, we prepared interlayer-I-doped BiOIO₃ nanoplates by a facile method. Interestingly, it was found that I atoms were doped into the BiOIO₃ interlayers instead of substituting for the lattice atoms based on theoretical and experimental results. The interbedded I atoms endowed BiOIO₃ with an extended light response from the UV to the visible region by narrowing the bandgap and generating a middle level. The enhanced oxidation capability via positive-shifting the valence band position and improved carrier separation efficiency via forming charge delivery channels at the adjacent two layers can be achieved simultaneously. As expected, I-intercalated BiOIO₃ with an optimized electronic structure demonstrated outstanding NO removal ability under visible light irradiation, much superior to pure BiOIO₃. The present success in fabricating interlayer-I-doped BiOIO₃ would open a promising route to prepare other Bi-based layered semiconductors with efficient visible-light photocatalysis.