Studies On The Preparation, Characterization And Catalytic Property Of The Heteropoly Acid And Its Salt

Heterropolyacid was composed with atoms (such as P, Si, Fe and Co) and polyatoms (such as Mo, W, V and Ta) for a class of general oxygen acid according to certain structure through the coordination of the oxygen atoms. And it received widely attention in the field of catalysis because of advantages of its unique acidic and quasi-liquid behavior.With the development of industry, ecological environment was destroyed, especially the pollution of limited water resource, removing the organic dye, such as Methylene blue and other toxic and harmful chemical substances had become an important task for environmental protection. As a solid acid, heterropolyacid with good acidity and catalytic oxidation can effectively degrade dyes and other organic pollutants. In addition, it had the performances of low toxicity, no environmental pollution, high activity, mild reaction conditions, no corrosion to equipment characteristics. Because of photocatalytic can effectively degradate the organic pollutants into inorganic small molecules, which gained popular attention of the low energy consumption, easy operation, mild reaction conditions, advantages of no pollution. A lot of refractory or difficult to remove by other methods, can use this method to remove.In this paper, cobalt potassium tungstate, Keggin single vacant heteropoly acid salt catalyst was prepared, and XRD, FT-IR and TEM methods was used to characterize the materials. The photocatalytic degradation of Methylene blue, Rhodamine B, Safranine T and acid catalytic synthesis of isoamyl acetate and butyl lactate by using these catalysts were investigated, and the effects of experimental conditions on the degradation rate and the rate of esterification were detected.