Tungsten oxide nanopowder, which may he used for producing near-infrared shielding material, has a certain photocatalytic performance, however, its photocatalytic activity is not high. Therefore, it is necessary to find a method to enhance the photocatalytic activity of tungsten oxide. For example, the photocatalytic activity of tungsten oxide may be improved by the method of metal load.
Four kinds of metal load tungsten trioxides were studied, including Rh/WO3, Pt/WO3, Au/WO3 and Ag/WO3. It was found that the photocatalytic activities of these four metal load tungsten trioxides were higher than those of unloaded tungsten trioxide. In addition, the study also found that both Au/WO3 and Ag/WO3 have good photocatalytic activity. This is mainly because the load metal not only promotes the separation of the photo-generated carriers of the semiconductor, but also has a surface plasmon resonance effect. The metal particles absorb visible light, inject activating electrons into the semiconductor through a plasma effect and undergo a reduction reaction.
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