中文摘要：

采用乙二醇溶胶-凝胶法制备了BiVO4样品,研究了不同反应pH值对样品的形貌及光催化活性的影响.通过SEM,XRD,XPS和UV-Vis等表征手段对样品的形貌、物相以及光学性能进行表征和分析.结果表明：所制备的样品纯度较高,均为单斜型BiVO4光催化剂,并且随着反应pH值的改变,样品的形貌及光学性能也随之改变;当pH值为5时,产物为不规则的片状结构;当pH值增至7和9时,产物片状结构大量减少,表现出明显的颗粒状结构;当反应pH值增至11和13时,产物颗粒状结构团聚明显.当pH值为9时,所制备的样品具有最小的禁带宽度以及最小的晶体粒径,并且表现出最高的光催化活性,在250W金属卤化物灯下光照50min,对甲基橙的脱色率可达66.23％.

英文摘要：

The visible-light-driven BiVO4 photocatalysts were synthesized by ethylene glycol sol-gel method. The effect of different pH values on microstructure and photocatalytic properties of BiVO4 was studied. The samples were characterized by SEM, XRD, XPS and UV-Vis DRS analyses. The results show that all samples have high purity and all samples are monoelinic. The morphology and photocatalytic properties of the samples change when the pH value changes. When the pH value is 5, the sample is irregular lamellar structure;when the pH value increases to 7 and 9, the sample shows obvious granular structure and much less sample for the irregular structure; when the pH value increases to 11 and 13, the granular structure has the phenomenon of aggregation. The sample of pH= 9 has the smallest band gap energy and the minimum grain size, and shows the highest photocatalytic activity. The total decoloration rate of methyl orange is 66. 23% under 250W metal halide light for 50min.