Tungstate / Silver Bromide Photocatalyst and Its Preparation Methods

For a long time, TiO₂ has been the preferred material for photocatalysis. Until 1983, Chinese scholars used WO₃ to deal with printing and dyeing wastewater for the first time, and achieved very good results. Tungstate has narrower forbidden band width (2.8eV) than TiO₂. It is considered to be one of the most potential photocatalysts.

Tungstic acid photocatalyst has many advantages, for example, tungstate zinc tungstate, bismuth tungstate, cadmium tungstate and so on. And then the morphology is controllable, such as nanoparticles, nanorods, porous films and so on. In addition, there are many advantages, such as simple synthesis, stable chemical properties and so on.

As a photosensitive material, silver bromide has a good response to light, but its energy band is relatively high, it can only absorb ultraviolet light and is unstable under light. Tungsten trioxide is the main raw material for synthesizing tungstate, tungsten trioxide undergoes self-reduction during its synthesis with silver bromide. Therefore, some scholars have proposed to give up the tungsten trioxide, the direct combination of silver tungstate and silver bromide can be prepared by a high photocatalytic activity, easy separation, high utilization of solar energy visible light photocatalyst.

After the synthesis of photocatalyst effectively overcomes the disadvantages of tungsten trioxide and silver bromide. The use of compound tungstate with silver bromide, effectively inhibited the decomposition of tungsten trioxide and its bromide reduction, to ensure its light stability, the gap is narrow, can effectively absorb visible light enhanced system of visible light absorption band and silver tungstate, can make full use of the sun the energy, the prepared tungstic acid / silver bromide photocatalyst has the characteristics of high photocatalytic activity, easy separation and high utilization of solar energy. It can be used for photolysis of water, decomposition of organic matters and sterilization. Its effect is much better than the widely used photocatalytic material TiO₂.

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