rGO BiVO4 BiOCl三元复合物的制备及光催化性能

Preparation and Photocatalytic Property of rGO-BiVO4-BiOCl Ternary Complex

采用溶剂热法合成了rGO-BiVO4-BiOCl异质结,讨论了样品在可见光下对亚甲基蓝(MB)的光催化降解活性.结果表明,rGO-BiVO4-BiOCl复合物的吸收波长可达到580 nm,提高了催化剂对可见光的吸收能力.采用300 W氙灯(λ> 420 nm)模拟可见光,rGO-BiVO4-BiOCl质量比为1∶400∶1 000的样品照射120 min对MB降解率达到96.3%,分别是BiVO_4和BiOCl的2.5倍和2.2倍.三元复合物提高了电子和空穴的分离效率,增强了光催化活性.

The rGO-BiVO4-BiOCl heterojunction was synthesized by solvothermal method.The photocatalytic degradation activity for methylene blue under visible light was discussed.The experimental results showed that the absorption wavelength of rGO-BiVO4-BiOCl was 580 nm,indicating that the ternary combination can improve the absorption capacity of the catalyst for visible light.Under the irradiation of 300 W xenon lamp(λ>420 nm),the degradation rate of methylene blue catalyzed by rGO-BiVO4-BiOCl with the mass ratio of 1∶400∶1 000 reached 96.3 % after 120 min,which was 2.5 and 2.2 times higher than that of pure BiVO4 and BiOCl,respectively.Ternary complex facilitated the electron transfer of BiVO4 and BiOCl,improving the separation efficiency of electrons and holes,and enhancing the photocatalytic activity.