Study on Characterization and Preparetion of Bismuth Tungstate

Abstract

With the solvent of ethylene glycol, it is synthetized the bismuth tungstate(BWO) catalyst with controllable morphology. By using X ray powder diffraction(XRD) and the scanning electron microscope(SEM and TEM), the products are characterized. It is found that glycerol content can affect the morphology and structure of bismuth tungstate. The result is as follows: BWO is amorphous powder, and in front of the high temperature, it is a roasting scheelite layered structure, for nano single crystal phase. After high temperature roasting, it is changed into amorphous powder, and reunion. The oxidation mechanism of BWO is that the hole conduction band position of BWO is low, the surface hydroxyl, less after inspired by ultraviolet light can effectively reduce the concentration of organic matter.