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Hydrothermal Synthesis and Visible-light Photocatalytic Properties of BiVO_4 with Different Structures and Morphologies

GUO Jia1,ZHU Yi2,ZHANG Yuan-Ming2,LI Ming-Yu3,YANG Jun2(1.Department of Ecology,Jinan University,Guangzhou 510632,China;2.Department of Chemistry,Jinan University,Guangzhou 510632,China;3.Department of Environment Engineering,Jinan University,Guangzhou 510632,China)  
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.
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