Bismuth Tungstate Preparation by Microemulsion Method
Bismuth tungstate (Bi 2 WO 6 ) is an oxide with perovskite like structure, and is a typical n type semiconductor. Bismuth tungstate has become a new hot spot of photocatalysis because of its unique crystal structure. The preparation methods of bismuth tungstate include solvothermal method, precipitation method, microemulsion method, hydrothermal method, etc.. Among them, microemulsion method is a new method for preparing ultrafine powders, which can be used to prepare nanometer bismuth tungstate, which is relatively simple and the powder morphology is easy to control. Microemulsion refers to two mutually insoluble reaction solutions which form isotropic and thermodynamically stable emulsions under the influence of surfactants, the reactants are nucleated, agglomerated, agglomerated, crystallized and grown in tiny vacuoles and then treated at high temperatures (usually less than 240 degrees) to form nanoparticles. Microemulsion can be divided into three types: water-in-oil...