Abstract
Herein, we, for the first time, have developed a facile anion intercalation method to prepare uniform Bi2O2[BO2(OH)]/Bi2O3 and Bi2O2[BO2(OH)] nanosheets, in which H2O2 is employed as the exfoliating reagent to break the weak Bi−O bonds (2.572 A) between [Bi2O2]n2n+ layers, then allowing borate ion to precisely intercalate into [Bi2O2]n2n+ layers. Further, density functional theory (DFT) calculations reveal that both O 2p and B 2p of [BO3]3− layer obviously contribute to an downshift of valence band (VB) and upshift of conduction band (CB), leading to a wider band gap of Bi2O2[BO2(OH)]. Thus, Bi2O2[BO2(OH)]/Bi2O3 exhibit a higher photocatalytic activity than Bi2O3 for the degradations of rhodamine B (RhB) under ultraviolet light irradiation (λ < 420 nm), which may be resultant from a synergetic effect of double internal electronic field that has improved charge separation efficiency. For featured layered materials, anion intercalation is an artful facile strategy to develop new, efficient photocatalysts.
Published Version
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