Hydrothermal fabrication and visible-light-driven photocatalytic properties of bismuth vanadate with multiple morphologies and/or porous structures for methyl orange degradation.
Monoclinic BiVO4 with multiple morphologies and/or porous structures were fabricated using the hydrothermal strategy. The materials were characterized by means of the XRD, Raman, TGA/DSC, SEM, XPS, and UV-Vis techniques. The photocatalytic activities of the BiVO4 materials were evaluated for the degradation of Methyl Orange under visible-light irradiation. It is observed that pH value and surfactant exerted a great effect on the morphology and pore structure of the BiVO4 product. Spherical BiVO4 with porous structures, flower-cluster-like BiVO4, and flower-bundle-like BiVO4 were generated hydrothermally at 100 degrees C with poly(vinyl pyrrolidone) (PVP) and urea (pH = 2) and at 160 degrees C with NaHCO3 (pH = 7 and 8), respectively. The PVP-derived BiVO4 showed much higher surface areas (5.0-8.4 m2/g) and narrower bandgap energies (2.45-2.49 eV). The best photocatalytic performance of the spherical BiVO4 material with a surface area of 8.4 m2/g was associated with its higher surface area, narrower bandgap energy, higher surface oxygen vacancy density, and unique porous architecture.
Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China.
Haiyan
H
Jiang
Hongxing
H
Dai
Xue
X
Meng
Lei
L
Zhang
Jiguang
J
Deng
Yuxi
Y
Liu
Chak Tong
CT
Au
D001391:Azo Compounds / Q000737:chemistry*; D001729:Bismuth / Q000737:chemistry*; D002384:Catalysis; D007202:Indicators and Reagents / Q000737:chemistry*; D008027:Light; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D012666:Semiconductors; D014638:Vanadates / Q000737:chemistry*
D001391:Azo Compounds; D007202:Indicators and Reagents; C091754:bismuth vanadium tetraoxide; D014638:Vanadates; C100258:methyl orange; D001729:Bismuth