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Br-Doped Bi2O2CO3 exposed (001) crystal facets with enhanced photocatalytic activity

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Abstract

A Br-Doped Bi2O2CO3 exposed (001) crystal facet was synthesized by a one-pot hydrothermal method. The results of the total densities of states of the valence band (VB) and UV-vis diffuse-reflectance spectrum (DRS) for the Br-doped Bi2O2CO3 exposed (001) crystal facet demonstrate that the doping of the Br anion can effectively narrow the band gap of Bi2O2CO3 by improving the valence band position. The photocatalytic performance is evaluated by degrading methyl orange (MO) and rhodamine B (RhB) dyes in an aqueous solution. In comparison with pure Bi2O2CO3, Br-doped Bi2O2CO3 exhibits drastically enhanced solar-light photoactivity, which is also superior to many other reported Bi2O2CO3-based photocatalysts. The highly enhanced photocatalytic performance is attributed to a combination of expanded photoresponse range caused by the doping of Br anions and effective separation of the photogenerated electron–hole pairs owing to the exposed active (001) crystal facet of Bi2O2CO3. The Br-doped Bi2O2CO3 exposed (001) crystal facet also shows photochemical stability, which is of special importance for its practical applications. This work demonstrates that doping enables band gap engineering and the design of high-performance photocatalysts.

Graphical abstract: Br-Doped Bi2O2CO3 exposed (001) crystal facets with enhanced photocatalytic activity

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Publication details

The article was received on 16 May 2017, accepted on 19 Jul 2017 and first published on 19 Jul 2017


Article type: Paper
DOI: 10.1039/C7CE00924K
Citation: CrystEngComm, 2017, Advance Article
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    Br-Doped Bi2O2CO3 exposed (001) crystal facets with enhanced photocatalytic activity

    J. Xu, K. K. Wang, T. Liu, Y. Peng and B. G. Xu, CrystEngComm, 2017, Advance Article , DOI: 10.1039/C7CE00924K

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