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采用水热法制备了膨润土负载的膨润土/BiVO_4复合材料,借助XRD、IR、SEM、DRS等表征了掺杂膨润土前后的BiVO_4结构、光化学性质的变化。膨润土/BiVO_4复合材料保持了母体BiVO_4的单斜结构,SEM结果证实膨润土负载在钒酸铋的表面,DRS结果显示膨润土负载的样品在可见光区的吸收增强。研究表明,10%膨润土/BiVO_4样品的光催化活性最高,可见光照射300min对亚甲基蓝溶液的降解率达92%,与纯BiVO_4相比,其光降解率提高了1.04倍。
Bentonite / BiVO 4 composites were prepared by hydrothermal method. The structure and photochemical properties of BiVO 4 were characterized by XRD, IR, SEM and DRS. The bentonite / BiVO_4 composite maintains the monoclinic structure of the parent BiVO_4. The SEM results confirm that the bentonite is supported on the surface of bismuth vanadate. The DRS results show that the bentonite-supported sample has enhanced absorption in the visible region. The results showed that the photocatalytic activity of 10% bentonite / BiVO 4 sample was the highest, the degradation rate of methylene blue solution was 92% after 300 min visible irradiation, and the photodegradation rate was 1.04 times higher than that of pure BiVO 4.