BiVO4纳米材料制备及其光催化性能

Preparation of BiVO4 nanomaterial and its photocatalytic property

以柠檬酸钠为表面活性剂,采用水热法制备了一系列形貌可控且规则的BiVO4纳米材料。借助X射线衍射仪、紫外-可见分光光度计和荧光分光光度计对其性质进行了表征;同时,将其用于可见光催化降解亚甲基蓝,以此评价光催化剂的活性和光稳定性。结果表明:所制备的BiVO4光催化剂为纯单斜相结构。随着柠檬酸钠用量的增加,BiVO4半导体对可见光的吸收范围扩大,荧光发射强度降低。在可见光条件下,当柠檬酸钠用量为0.15 g时,所制备的BiVO4光催化剂对亚甲基蓝光降解速率常数为0.0053 min^-1,降解效果最好;当反应进行到315 min时,有机污染物亚甲基蓝的去除率达到83%。

Series of BiVO4 nanomaterials with controllable and regular morphology were prepared by hydrothermal method with sodium citrate as surfactant.Its properties were characterized by X-ray diffraction,UV-visible spectrophotometer and fluorescence spectrophotometer.Meanwhile,the photocatalytic activity and photostability of BiVO4 nanomaterials were evaluated by degradation of methylene blue under visible light.The results showed that BiVO4 photocatalyst was pure monoclinic phase.With the increase of sodium citrate,the absorption range of BiVO4 semiconductor was broadened in visible light,and the PL emission intensity of BiVO4 photocatalyst was reduced.Finally,the 0.15-BiVO4 photocatalyst achieved the optimal methylene blue degradation rate constant of 0.0053 min^-1 and removal rate of 83%after 315 min under visible light irradiation.