Using Hydrothermal Crystallization Method Produce Tungsten Trioxide Photocatalyst

Tungsten trioxide as a photocatalyst has broad application prospects in terms of the degradation of organic and inorganic materials. Using solid phase calcination method with the different row material APT and H2WO4 the photocatalyst property is different. At high temperatures the APT as raw materials producing hexagonal phase WO3-X photocatalyst has better property.

But the study proved that H2WO4 as raw materials and using hydrothermal crystallization method will produce hexagonal phase WO3-X, oxygen index is 2.50, photocatalytic water splitting performance is greatly improved. Using hydrothermal crystallization method, the raw material will change with increasing temperature. With increasing temperature, the product will be from WO3-X. 0.33H2O converted to hexagonal phase WO3-X and in the development of temperature it will further change to monoclinic WO3-X. At the beginning WO3-X photocatalytic will be changed for the better with increasing temperature, but with the hexagonal phase WO3-X slowly transformed into monoclinic WO3-X, its photocatalytic water splitting performance is slowly reduced. From that we kown with the gradual reduction of oxygen index, WO3-X photocatalytic decomposition of water rate is increased, after reaching the limit there will has a sharp decline. This is means the photocatalytic properties of WO3-X there is an optimum content of oxygen vacancies. When the oxygen index is 2.44 to 2.50, its photolysis rate is high. Therefore hexagonal phase WO3-X will help improve the WO3-X photocatalytic water splitting properties.

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