Ammonium Paratungstate Preparing Tungsten Bismuth Light Catalyst

Handling the environmental pollution is the focus and urgent problems for human today, especially governance of organic pollutants. Photocatalytic technology has the advantages that low energy consumption, clean mild conditions, no secondary pollution, etc. in purify organic pollutants, being a green environmental control technology which has a broad application prospect. Tungsten bismuth (Bi₂WO₆), as a new type of bismuth series light catalyst, is a multi-compound with layered structure. And because of its high catalytic activity under visible light irradiation, it can decompose water to produce oxygen and degradation of organic matter, making it particularly suitable for environmental pollution control and solar energy conversion.

Studies have pointed out a method that uses ammonium paratungstate as a raw material for preparing bismuth tungstate with three-dimensional wheel-like hierarchical structure. The steps are as follows:

1. Dissolving the bismuth salt in dilute aqueous acid to form a clear solution;
2. Dissolving ammonium paratungstate by a certain percentage in deionized water to obtain APT aqueous solution;
3. Add APT solution slowly into the clear solution obtained in Step 1, and continue stirring for 0.5~l hour to obtain solution named A;
4. Dissolving an amount of sulfate in deionized water, and slowly adding it into solution A, and continue stirring for 0.5~l hour, to obtain solution named B;
5. Transferring B solution into a stainless steel autoclave containing Teflon-lined, and heated to 150~200°C for 10~30h, to generate products;
6. The products is washed and carried out centrifugation, and dried under vacuum at 50~100°C, to obtain the bismuth tungstate with three-dimensional wheel-like hierarchical structure.