Effect of Preparation Parameters on Photoactivity of BiVO4by Hydrothermal Method

[摘要] Bismuth vanadate (BiVO4) was synthesized from a mixture of aqueous Bi(NO3)3and NH4VO3solutions by using hydrothermal method. Via conducting the orthogonal experiments and single-factor experiments, the best synthetic parameters were determined. The physical and photophysical properties of the as-obtained samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and UV-Vis diffusion reflectance spectroscopy (UV-Vis). The result showed that the best experimental parameters of monoclinic BiVO4werepH=7,T=195 °C, and  t=6 h. The catalytic performance of BiVO4was evaluated by reducing carbon dioxide to methane under visible light irradiation. It was found that the methane production reached 145 μg/g-cat after 5 h irradiation with the catalyst dosage of 0.15 g in 200 mL mixed solution of 0.1 M NaOH and 0.1 M Na2SO3.

[学科分类] 材料工程