Tungsten Trioxide Photocatalyst Ion Exchange Method

Tungsten trioxide photocatalyst has a wide range of applications because of its excellent material properties. Tungsten trioxide photocatalysts have different methods of synthesis, and ion exchange is a method based on ion exchange reactions.

Ion exchange reaction is an in-situ reaction that can effectively construct heterojunctions. At the same time, the synthesized heterojunctions can be in close contact with each other, which is in favor of the mutual migration of photogenerated carriers of tungsten oxide in two phases.

Tungsten trioxide composite system, the ion exchange method tungsten trioxide carrier migration between the two phases can be broadly divided into two categories. Namely ion exchange ring current type and ion exchange Z-type system. The principle that occurs for the ion exchange ring current pattern is that tungsten trioxide generates photoelectrons and holes will migrate from the higher redox energy band to the lower redox band, respectively. As long as the reduction of photogenerated carrier potential of tungsten trioxide can satisfy the condition of photocatalytic reaction, the separation of photogenerated carriers will be improved and the photocatalytic activity of the material will be improved.

For ion-exchange Z-type systems, it will retain the highest redox capacity of tungsten oxide photo-generated carriers in the two-phase monomer. The redox ability of tungsten trioxide photoacid carriers will occur composite reaction. It can be seen from these two ways that the Z-type system will be more conducive to the photocatalytic reaction of tungsten trioxide.

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