Silver Tungstate / Graphene Composite Photocatalyst

Photocatalytic technology is a technology that uses light energy as energy to realize catalysis. The photocatalytic properties of tungstate have been confirmed by many researches. However, in terms of catalytic efficiency, zinc tungstate, bismuth tungstate and cadmium tungstate are reported more, while silver tungstate is relatively few. This is because the photocatalytic properties of silver tungstate are also worthy of improvement.

At present, inhibiting the recombination of photogenerated electron hole pairs and increasing the specific surface area of catalysts are two effective ways to improve the photocatalytic activity of catalysts. Doping modification of photocatalyst can effectively inhibit photoelectron hole recombination and increase the interfacial mobility of photoelectron hole. Graphene is a single-layer graphite crystal with large specific surface area and good adsorption capacity for pollutants. Meanwhile, the good transmittance of graphene provides a good condition for photocatalysis. In recent years, graphene has been widely applied in the field of preparation of composite catalytic materials.

Due to the existence of graphene, the photogenerated electrons of silver tungstate can be captured in order to inhibit their recombination and improve the quantum efficiency. At the same time, the wavelength range of absorption light can be expanded effectively, and the utilization rate of visible light can be improved. It can effectively promote the oxidation and decomposition of pollutants by silver tungstate.

Tungstic acid silver / graphene composite is green, preparation process is simple, easy to get raw materials. Compared with the traditional single silver tungstate catalyst, the composite photocatalyst can synergy silver tungstate and graphene, promote photoinduced charge separation, broaden the light response range of silver tungstate catalyst, improve the catalytic stability of silver tungstate, and is conducive to recovery of silver tungstate utilization, reduces the cost.

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