4.6 Article

Template-Free Synthesis of Monoclinic BiVO4 with Porous Structure and Its High Photocatalytic Activity

Journal

MATERIALS
Volume 9, Issue 8, Pages -

Publisher

MDPI
DOI: 10.3390/ma9080685

Keywords

bismuth vanadate; porous structure; photocatalysis

Funding

  1. National Natural Science Foundation of China [21403184, 21276220]
  2. Natural Science Foundation of the Jiangsu Higher Education Institutions of China [14KJB150025, 15KJA430007, 14KJB430023]
  3. China Postdoctoral Science Foundation [2014M561622]
  4. Jiangsu Collaborative Innovation Center for Ecological Building Materials and Environmental Protection Equipments [GX2015102, CP201502]
  5. National Key Research and Development Project of China [2016YFC0209202]

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Monoclinic BiVO4 photocatalysts with porous structures were synthesized by a two-step approach without assistance of any templates. The as-prepared samples were characterized by X-ray diffraction pattern (XRD), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET), ultraviolet-visible (UV-vis) diffuse reflectance spectroscopy (DRS), photocurrent responses, and electrochemical impedance spectra (EIS). It is found that the as-prepared BiVO4 samples had a porous structure with aperture diameter of 50-300 nm. Moreover, the BET specific surface area of the porous BiVO4-200 degrees C sample reaches up to 5.69 m(2)/g, which is much higher than that of the sample of BiVO4 particles without porous structure. Furthermore, a possible formation mechanism of BiVO4 with porous structure was proposed. With methylene blue (MB) as a model compound, the photocatalytic oxidation of organic contaminants in aqueous solution was investigated under visible light irradiation. It is found that the porous BiVO4-200 degrees C sample exhibits the best photocatalytic activity, and the photocatalytic rate constant is about three times of that of the sample of BiVO4 particles without porous structure. In addition, the photocurrent responses and electrochemical impedance spectra strongly support this conclusion.

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