Bismuth Tungstate Preparation by Solid Phase Method
Bismuth tungstate is a new photocatalyst developed in recent years.
It has the characteristics of narrow band gap, good catalytic performance, stable photocatalytic and environmental protection, and has become a new hot spot in the field of photocatalyst.
The preparation methods of bismuth tungstate mainly include solid phase method and liquid phase method. In general, they are fire process and wet process. Solid phase method is the preparation of bismuth tungstate by sintering at high temperature, compared with the liquid phase method, the solid phase method is more adopted by enterprises. Because most of the smelting enterprises adopt solid phase method to obtain tungsten powder, calcination equipment can be used in conjunction with each other, and the equipment foundation is the reason why solid phase method is more popular. The synthesis principle of bismuth tungstate solid phase method is mechanical processing containing Bi and W elements in the oxide material or its salt, then, the product obtained by mechanical processing and mixing directly through high temperature sintering can obtain bismuth tungstate products.
Some scholars believe that the preparation of solid phase preparation of the ambient temperature is the key to determine the preparation of bismuth tungstate, thus, he tested the 573K, 673K, 773K, 873K, 973K five temperature. Finally, the optimum calcination temperature of bismuth tungstate photocatalyst is 873 K, too low or too high calcination temperature will decrease the activity of bismuth tungstate photocatalyst.
Solid phase process is a relatively mature method for preparing bismuth tungstate, but its inadequacy is also accepted, but its deficiency is also obvious. The main reason is that the process needs to be heated by high temperature, and the energy consumption is greater, what is more serious is the size of the particles, the specific surface area and other factors, the performance of bismuth tungstate catalyst prepared by solid phase method is relative poor to liquid phase. Therefore, in recent years, the use of solid phase method of bismuth tungstate enterprises gradually reduced.
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