Synthesis of hierarchical m-BiVO_4 particles via hydro-solvothermal method and their photocatalytic properties

摘要

A facile hydro-solvothermal method based on hydrothermal technique has been developed for the synthesis of monoclinic BiVO_4 powders with hierarchical structures, using Bi(NO_3)_3 ? 5H_2O and NaVO_3 as raw materials, and oleylamine as surfactant. The phase structure and morphology of as-prepared BiVO_4 particles are characterized by X-ray diffraction, field scanning electron microscope and transmission electron microscopy, respectively. The UV-vis absorption spectra and BET special surface areas are also measured. The influences of volume ratio of water/toluene and the pH value of aqueous phase on the morphology of BiVO_4 particles have been investigated to obtain the different shapes. The possible mechanisms for the synthesis technology and shape self-assembly of BiVO_4 are discussed. The results of the photocatalytic activity of as-prepared BiVO_4 show that sphere-like and needle-like BiVO_4 polycrystalline particles exhibit more excellent visible-light photocatalytic and satisfied recycling properties.