Yellow tungsten oxide, namely tungsten trioxide or WO3, is a kind of semiconductor material having excellent performance and wide applications. As a semiconductor photocatalyst, tungsten trioxide has a wide range of applications in the fields of photolysis of water to produce hydrogen and oxygen, and degradation of organic pollutants or inorganic pollutants. However, the photocatalytic activity of WO3 needs to be further improved to make better use of solar energy. In this regard, the experts have proposed a method to improve the photocatalytic activity of yellow tungsten oxide.
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By choosing suitable particle size of WO3 powder catalyst. Particle size is one of the factors affecting the catalytic activity of semiconductor photocatalysts. The smaller the particle size, the larger the number of particles per unit mass, and the larger the specific surface area, which is conducive to the photocatalytic reaction on the surface, and the photocatalytic reaction rate and efficiency are also increased. When the particle size is 1-10nm, a quantum effect will occur. And the particles become quantized particles, which will cause a noticeable widening of the forbidden band, so that the electron-hole pair has a stronger oxidation-reduction ability, and the catalytic activity will be increased with increasing quantization of size. So, in practical application, a suitable particle size range of WO3 powder photocatalyst should be selected.
