Tungsten Heteropoly Acid Photocatalyst

A tungsten heteropoly acid phtocatalyst is composed of heteropoly acid and its salt, it consists of a central (hetero) atom (P, Si, etc.) and a coordinated (multi) atom W.

A group of metal complexes of oxygen groups bridged by oxygen atoms into space, which can be widely used in homogeneous and heterogeneous catalysis systems.

Because of the development of petrochemical industry, especially the fine chemical industry, the multifunction of catalysts has become a new research target, tungsten heteropoly acid photocatalyst is a bifunctional catalytic material with acidity and basicity and redox property. It is an environmentally friendly catalyst and can reduce environmental pollution and equipment corrosion. Therefore, it is of great significance to study the new catalytic process. Under visible light or UV irradiation, tungsten heteropoly acid is excited to become a strong oxidant and can oxidize various organic compounds in water. Its photocatalytic activity is almost as high as TiO₂.

Some scholars use PW₁₂O₄₀^3- as a catalyst, under the excitation of ultraviolet or near visible light, and the pesticide fenitrothion photodegradation were studied, the results showed that the light mineralization of fenitrothion, eventually transformed into PO₄^3-, SO₄^2-, NO₂^3-, NO₃ and other inorganic ions. The study of the catalytic mechanism shows that the reaction is mainly caused by the oxidation of OH radical. Some scholars also used water-soluble H₃PW₁₂O₄₀ as catalyst and stimulated by ultraviolet visible light, the fluorinated polyacrylate (NFPA) can be decomposed into F- and CO₂ at room temperature, and no harmful by-products such as CF₄ and CF₃H are produced.

Heteropoly compounds have the characteristics of strong acidity, oxidation and no pollution. They have laid a solid foundation for their important position in the field of catalysis. In recent years, these catalysts have shown an attractive prospect in photocatalytic chemistry, making it possible to make greater use of sunlight.

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