Photocatalytic degradation of methylene blue on CaBi6O10/Bi2O3 composites under visible light

► CaBi6O10/Bi2O3 composite is a novel visible-light driven catalyst. ► CaBi6O10/Bi2O3 photocatalyst shows high activity for methylene blue degradation. ► The generation of OH during reaction is proven by photoluminescence spectra. ► The coupling effect between CaBi6O10 and Bi2O3 is the reason of the...

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Bibliographic Details
Published in:	Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2012-05, Vol.189-190, p.473-481
Main Authors:	Wang, Yongjiao, He, Yiming, Li, Tingting, Cai, Jun, Luo, Mengfei, Zhao, Leihong
Format:	Article
Language:	eng
Subjects:	Applied sciences Bi2O3 Biological and physicochemical phenomena CaBi6O10 CaBiO composite calcium Catalysis Catalytic reactions Chemical engineering Chemistry Coupling effect energy Exact sciences and technology General and physical chemistry irradiation methylene blue Natural water pollution photolysis Pollution Raman spectroscopy Reactors reflectance scanning electron microscopy semiconductors Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry transmission electron microscopy Visible light water pollution Water treatment and pollution X-ray diffraction
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Summary:	► CaBi6O10/Bi2O3 composite is a novel visible-light driven catalyst. ► CaBi6O10/Bi2O3 photocatalyst shows high activity for methylene blue degradation. ► The generation of OH during reaction is proven by photoluminescence spectra. ► The coupling effect between CaBi6O10 and Bi2O3 is the reason of the high activity. Calcium bismuthate (CaBi6O10/Bi2O3) composites synthesized using a simple deposition method were used as visible-light driven photocatalysts for dye degradation in polluted water and their activities were investigated. The photocatalysts were characterized via X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) analysis, Raman spectroscopy (Raman), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), and UV–vis diffuse reflectance spectroscopy (DRS). The photocatalytic activity of the CaBiO composites was evaluated through the decomposition of methylene blue in an aqueous solution under visible light irradiation (>420nm). The CaBi6O10/Bi2O3 binary semiconductors exhibit better photocatalytic properties compared with those of the single-phase CaBi6O10 or Bi2O3. Based on the results of the energy band position calculation and the terephthalic acid photoluminescence (PL) probe experiment, the effective electron–hole separation in the two semiconductors is considered the cause of the high activity.
ISSN:	1385-8947 1873-3212