Preparation and Visible-light-driven Photocatalytic Performance of Porous Rod-like FeVO4

doi:10.15541/jim20170586

Abstract

Abstract:

Pure triclinic porous FeVO₄ with multiple morphologies were fabricated by adopting hydrothermal strategy using Fe(NO₃)₃ and NH₄VO₃as inorganic source and NH₃solution as pH adjuster. The samples were characterized by means of techniques such as X-ray diffraction, scanning electron microscopy, and ultraviolet-visible diffuse reflectance spectroscopy. It was found that hydrothermal temperature and pH of the precursor solution exerted a great effect on the crystalline structure and the particle morphology of the product. Porous triclinic FeVO₄ nanorods were generated hydrothermally at 180℃ and pH of 4 or 7, sheet-like FeVO₄ was obtained at pH 4.0 and hydrothermal temperature of 120℃. However, the mixture of Fe₂O₃ (in majority) and FeVO₄ (in minority) was prepared when pH of the precursor solution was raised to 10 at 180℃ or the hydrothermal temperature was raised to 240℃ at pH 4.0. Among the FeVO₄samples, porous FeVO₄ nanorods with the highest surface area of 10.4 m²/g exhibited the best visible-light-driven photocatalytic performance for the degradation of MO. It is concluded that such an excellent photocatalytic performance is attributed to its higher crystallinity, surface area, and surface oxygen vacancy density, porous structure, and lower bandgap energy.

Key words: porous nanorods, FeVO₄, hydrothermal method, photocatalytic performance

CLC Number:

TQ174

JIANG Hai-Yan, XIA Yun-Sheng, LI Yu-Zhen. Preparation and Visible-light-driven Photocatalytic Performance of Porous Rod-like FeVO₄[J]. Journal of Inorganic Materials, 2018, 33(9): 949-955.

Figures/Tables 8

Fig. 1 XRD patterns of the samples(a) FeVO4-180-4; (b) FeVO4-180-7; (c) FeVO4-180-10; (d) FeVO4- 120-4; (e) FeVO4-240-4

Fig. 2 TGA/DSC profile of the FeVO4-180-4 sample before calcinations

Fig. 3 SEM images of the FeVO4 samples(a) FeVO4-180-4; (b) FeVO4-180-7; (c) FeVO4-120-4

Fig. 4 TEM and HRTEM images of the FeVO4 samples(a) FeVO4-180-4; (b) FeVO4-180-7; (c) FeVO4-120-4

Fig. 5 (A) N2 adsorption-desorption isotherms and (B) pore-size distributions of the FeVO4 samples

Fig. 6 (A) Fe2p, (B) V2p3/2, and (C) O1s XPS spectra of the FeVO4 samples(a) FeVO4-180-4; (b) FeVO4-180-7; (c) FeVO4-120-4

Fig. 7 (A) UV-Vis diffuse reflectance spectra and (B) plots of the (ahν)2 versus hν of the FeVO4 samples(a) FeVO4-120-4; (b) FeVO4-180-4; (c) FeVO4-180-7

Fig. 8 MO concentration versus visible-light irradiation time for the degradation of MO aqueous solution under visible-light irradiation (≥400 nm)

References 29

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Preparation and Visible-light-driven Photocatalytic Performance of Porous Rod-like FeVO₄

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