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

Author(s): GUO Jia, ZHU Yi, ZHANG Yuan-Ming, LI Ming-Yu, YANG Jun

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 27;
Issue: 1;
Start page: 26;
Date: 2012;
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Keywords: bismuth vanadate (BiVO4); hydrothermal synthesis; photocatalytic activity; additive-free

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¡䟡nd 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.

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