单斜BiVO_4的离子液体辅助水热合成及表征

Synthesis and Characterization of m-BiVO_4 via Ionic Liquid-assisted Hydrothermal Synthesis

在离子液体[BMIM]Br辅助的水热条件下,合成了斜钒铋矿(Clinobisvanite,m-BiVO4)片状多面体微米晶.采用XRD,XPS,IR和SEM等对产物物相、结构和形貌进行了表征.结果表明,m-BiVO4产物为单斜晶系,I2/b空间群,片状多面体长宽为8～12μm,厚度为2～5μm,晶型较完整,且具有良好的结晶度和分散性.离子液体对m-BiVO4形貌的控制作用可归结为[BMIM]+在m-BiVO4的(001)面吸附作用,在一定程度上抑制了该晶面的生长速率.

Clinobisvanite,m-BiVO4,sheet-like micro-crystals were synthesized via an ionic liquid-assisted hydrothermal method.The phase,structure and morphology were characterized by X-ray diffraction（XRD）,X-ray photoelectron spectroscopy（XPS）,Fourier transform infrared spectroscopy（FTIR）,and field emission scanning electron microscope（FESEM） techniques.The results indicated that m-BiVO4 micro-crystals had a monoclinic structure with I2/b space group,and had good dispersity and higher crystallinity.Moreover,the m-BiVO4 micro-crystals showed a sheet-like morphology with the length and width in the range of 8—12 μm and the thickness of 2—5 μm.The effects of Br on the formation of the m-BiVO4 were investigated systematically.It is believed that the effect of ionic liquids on the morphology can be attributed to the adsorption of ＋ on the（001） plane of m-BiVO4,which can inhibit the growth rate of the plane.