摘要： 采用水热法制备单斜晶型BiVO₄及活性炭掺杂的BiVO₄（C/BiVO₄）。利用X-射线衍射、N₂吸脱附和紫外-可见光漫反射光谱对样品进行表征，考察了2种样品在模拟太阳光下对Cr（Ⅵ）的降解。结果表明，活性炭的掺杂使BiVO₄晶粒度变小、比表面积增大、禁带宽度变窄，比BiVO₄具有更高的光催化活性。柠檬酸的加入可与BiVO₄发生协同效应，共同促进Cr（Ⅵ）的还原。在一定范围内，体系pH越低、C/BiVO₄投加量越多、柠檬酸浓度越高、Cr（Ⅵ）初始浓度越低，越有利于Cr（Ⅵ）的去除。

关键词: 光催化还原, 水热法, C/BiVO₄, 柠檬酸, Cr (Ⅵ)

Abstract: In this paper,monoclinic BiVO₄ and activated carbon-doped BiVO₄ were prepared using hydrothermal method. Then the prepared samples were characterized by X-ray diffraction,N₂ adsorption and desorption, and UV-vis diffuse reflection spectrum. At last, the degradation of Cr(Ⅵ) by these two samples was studied under simulated solar light. The results show that the doped activated carbon makes the grain size of BiVO₄ smaller,increases the specific surface area, and narrows the forbidden bandwidth. Compared with the pure BiVO₄,the activated carbon-doped BiVO₄ exhibits a higher photocatalytic activity. Besides,the addition of citric acid can promote the reduction of Cr(Ⅵ) via its synergistic effect with BiVO₄. Within a certain range, it is found that lower pH of the system,higher dosage of C/BiVO₄,higher concentration of citric acid and lower initial concentration of Cr(Ⅵ) are all beneficial to the removal of Cr(Ⅵ).

Key words: photocatalytic reduction, hydrothermal synthesis, C/BiVO₄, citric acid, Cr(Ⅵ)

中图分类号: 

• X703.1