Tungsten oxide nanopowder has photochromic property so that it may be applied for producing thermal insulation masterbatch. Tungsten oxide also has photocatalytic property, and therefore it can be used for the treatment of organic contaminated water. However, the photocatalytic activity of tungsten oxide is not so desired, and thus it is required to enhance its photocatalytic activity by means of semiconductor recombination.
For example, the WO3/Bi2WO6 composite photocatalyst was analyzed to find that the composite photocatalyst exhibited higher photocatalytic activity than the two single-phase photocatalysts. The small particles of WO3 in this sample were grown on Bi2WO6 nanosheets. Due to the formation of heterojunction between WO3 and Bi2WO6, a leveling phenomenon of the Fermi level occurred at the two semiconductor interfaces. When light was irradiated, both single-phase semiconductors could be excited by light and generate photo-generated carriers, which were separated by the built-in power plant. The migration of photogenerated carriers in the composite photocatalyst was that the photogenerated electrons migrated to Bi2WO6 on WO3, while the photogenerated holes migrated from Bi2WO6 to WO3.
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