Issue 34, 2017

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

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

Supplementary files

Article information

Article type
Paper
Submitted
16 May 2017
Accepted
19 Jul 2017
First published
19 Jul 2017

CrystEngComm, 2017,19, 5001-5007

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, 19, 5001 DOI: 10.1039/C7CE00924K

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