BiVO4-MCM-41复合催化剂的制备及其对亚甲基蓝降解的光催化活性

将单斜白钨矿结构的BiVO4固载于中孔MCM-41分子筛上,制备了BiVO4-MCM-41复合催化剂,并对催化剂进行了表征,考察了催化剂在光催化亚甲基蓝降解反应中的催化活性.结果表明,BiVO4首先在MCM-41分子筛上形成锆石结构或四面体白钨矿结构的结晶,通过水热处理之后转变为单斜结构的结晶.BiVO4-MCM-41催化剂不仅保持了BiVO4较高的光催化活性,而且提高了对亚甲基蓝的吸附性能,从而提高了对亚甲基蓝降解反应的光催化活性.

Preparation of BiVO4-MCM-41 Composite Catalyst and Its Photocatalytic Activity for Degradation of Methylene Blue

The BiVO4-MCM-41 composite catalyst was prepared by supporting BiVO4 with monoclinic scheelite structure on the surface of MCM-41 molecular sieve. The BiVO4-MCM-41 samples were characterized and their photocatalytic activity for degradation of methylene blue was measured. It was found that the zircon structure or tetragonal structure of BiVO4 was first crystallized on the surface of MCM-41 molecular sieve, and under the hydrothermal treatment, the monoclinic scheelite structure of BiVO4 was formed from the zircon structure or tetragonal structure. The catalyst possessed a larger specific surface area and therefore improved its photocatalytic activity for degradation of methylene blue owing to the increase of adsorption performance.