期刊
CHEMICAL ENGINEERING JOURNAL
卷 189, 期 -, 页码 473-481出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2012.02.079
关键词
CaBiO composite; Visible light; CaBi6O10; Bi2O3; Coupling effect
资金
- National Natural Science Foundation of China [21003109]
- program for Changjiang Scholars and Innovative Research Team in Chinese Universities [IRT0980]
- Doctor Startup Fund of Zhejiang Normal University [ZC304008169]
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 (>420 nm). 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. (c) 2012 Elsevier B.V. All rights reserved.
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