Bismuth Tungstate Preparation by Solid Phase Chemical Method

Bismuth tungstate is a multi-functional material, which has physical and chemical properties such as piezoelectricity, ferroelectricity, pyroelectricity and catalysis. It has been widely used in ionic semiconductors, ferromagnetic materials, catalysis and many other fields. The band gap of Bi₂WO₆ is only about 2.75eV. This is because the valence band of Bi₂WO₆ is composed of Bi₆s and O₂ orbital hybridization, which increases the valence band potential of photocatalyst and effectively reduces the band gap of semiconductor. Therefore, Bi₂WO₆ is considered as one of the most promising visible light-responsive semiconductor photocatalysts.

At present, researchers have used various methods to synthesize bismuth tungstate with special morphology under the action of templates and surfactants, such as hydrothermal synthesis, solvothermal method, sol-gel synthesis, solid-phase chemical synthesis, etc. solid phase wave synthesis method does not use solvents, and has high selectivity, high yield and process. Because of its simplicity, it has become an important method to synthesize nanomaterials. It mainly uses bismuth nitrate and sodium tungstate as reactants, synthesizes precursors by grinding at room temperature, and then gets bismuth tungstate nanosheets by heat treatment. The specific operation process is as follows:

Accurately weigh 0.01 mol Bismuth Nitrate and grind quickly after adding 0.02 mol Sodium Tungstate. As grinding proceeds, the mixture turns into a finer white powder. Continue grinding for 40 minutes to ensure that the reaction proceeds adequately. The reaction products are washed and dried to precursors, which are grinded at a speed of 5-10 oC/min in air. Bismuth tungstate nanosheets were prepared by heat treatment at 430 ℃ for 2 h.

Bismuth tungstate nanosheets were prepared by solid-phase chemical method, using cheap and readily available raw materials and simple grinding. The preparation method is simple, the product yield is high, and the environment is friendly. It is easy to realize mass production and has a very broad application prospects.

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