Tungsten oxide may be applied in thermal insulation film, which reflects its thermal insulation properties. And it may be used as a photocatalyst with good photocatalytic properties. However, there are some shortcomings in the photocatalysis process, so that it is necessary to improve the photocatalytic performance of tungsten oxide powder.
Researchers have made a lot of efforts to address the shortcomings of semiconductor photocatalysts in the photocatalytic process. In 1976, the first article on the field of photoelectrochemistry of tungsten trioxide was published. In 1979, Cu was successfully synthesized by photo-synthesis on tungsten trioxide powder, and its photocatalytic properties were studied. In 1980, tungsten trioxide was found to be useful for photocatalytic reduction of carbon dioxide and water, and the products formaldehyde and methanol were obtained. It has been found that tungsten trioxide can produce hydroxyl radicals in water under illumination, and hydroxyl radicals are a very important substance in photocatalytic degradation reactions. Since then, research based on tungsten trioxide photocatalyst has been carried out.
After research, some factors affecting the photocatalytic properties of photocatalysts have been discovered, such as morphology, grain size, modification of photocatalysts, element doping, precious metal loading and semiconductor recombination. At the same time, with the deepening of research, it was found that crystalline photocatalyst with different crystal faces have different photocatalytic activities.
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