Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 116, Issue 1, Pages 134-142Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2009.02.058
Keywords
Oxides; Chemical synthesis; Powder diffraction; Raman spectroscopy and scattering
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Funding
- Natural Science Foundation of Beijing [4082008]
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The three kinds of well-known bismuth molybdates alpha-Bi2Mo3O12, beta-Bi2Mo2O9, and gamma-Bi2MoO6 have been prepared employing mild hydrothermal methods. By tuning the Bi/Mo ratio and pH values, controlling formation of bismuth molybdates can be achieved. Low pH and high concentration of molybdenum lead to the formation of alpha-Bi2Mo3O12. High pH and high concentration of bismuth lead to the formation of gamma-Bi2MoO6. The pure form of the beta-phase can be prepared by calcining the hydrothermal product at 560 degrees C. Photophysical and photocatalytic studies show that Aurivillius structure gamma-Bi2MoO6 shows an intense absorption band in the visible light region and better photocatalytic activity than alpha-Bi2Mo3O12 and beta-Bi2Mo2O9 under visible light irradiation. The factors that result in different photocatalytic activities for three kinds of photocatalysts are discussed. (C) 2009 Elsevier B.V. All rights reserved.
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