Hydrothermal Synthesis and Visible-light Photocatalytic Properties of BiVO4 with Different Structures and Morphologies

doi:10.3724/SP.J.1077.2012.00026

Abstract

Abstract:

Visible-light photocatalysts BiVO₄ with different crystal structures and morphologies were prepared via a mild additive-free hydrothermal method. The as-prepared samples were well-determined by X-ray diffraction (XRD), scanning electron microscope (SEM), UV-Vis diffuse reflectance spectroscope (DRS) and low-temperature N₂ adsorption. The results indicated that both hydrothermal temperature and pH value of reaction solution had significant influence on the formation of crystal structures. Hydrothermal temperature of 180℃ and acidic condition facilitated the formation of monoclinic BiVO₄. The pH value of reaction solution also affected the morphologies of samples remarkably, which resulted in three different types: sheet-, cube- and rod-like shapes. All the samples were applied to the photodegradation of methylene blue (MB) under visible light and sheet-like BiVO₄ obtained in pH=2 reaction solution exhibited the best photocatalytic activity (4 h, 92.0%). In addition, influence factors of this photocatalytic system were thoroughly investigated, which included photocatalyst dosage, initial concentration and the existence of electron acceptors. The optimal photocatalytic condition was as follow: the dosage of catalyst was 1.0 g/L, the initial concentration of methylene blue was 10 mg/L, and KBrO₃ was used as electron acceptor.

Key words: bismuth vanadate (BiVO₄), hydrothermal synthesis, photocatalytic activity, additive-free

CLC Number:

O643

GUO Jia, ZHU Yi, ZHANG Yuan-Ming, LI Ming-Yu, YANG Jun. Hydrothermal Synthesis and Visible-light Photocatalytic Properties of BiVO₄with Different Structures and Morphologies[J]. Journal of Inorganic Materials, 2012, 27(1): 26-32.

Figures/Tables 10

Fig. 1 XRD patterns of BiVO4 obtained at different hydrothermal temperatures

Fig. 2 XRD patterns of BiVO4 obtained in reaction solution with different pH values

Fig. 3 SEM images of BiVO4 samples obtained in reaction solution with different pH values

Fig. 4 UV-Vis spectra of BiVO4 samples obtained in different conditions

Fig. 5 Changes of UV-Vis spectra of MB solution with irradiation time

Fig. 6 Photocatalytic activity of BiVO4 samples obtained in reaction solution with different pH values

Fig. 7 Effect of the dosage of BiVO4 on photocatalytic degradation of methylene blue

Fig. 8 Effect of the initial concentration of methylene blue on photocatalytic degradation

Fig. 9 Effect of different electron acceptors on photocatalytic degradation of methylene blue

Fig. 10 Effect of KBrO3 on UV-Vis spectra of MB solution

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Hydrothermal Synthesis and Visible-light Photocatalytic Properties of BiVO₄with Different Structures and Morphologies

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