Effect of Preparation Parameters on Photoactivity of BiVO4 by Hydrothermal Method

Abstract EN

Bismuth vanadate (BiVO4) was synthesized from a mixture of aqueous Bi(NO3)3 and NH4VO3 solutions 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 BiVO4 were pH=7, T=195 °C, and t=6 h.

The catalytic performance of BiVO4 was 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.