Study On Preparation And Visible-Light Photocatalytic Activity Of Bismuth Titanate Composite Materials

In this paper,a series of Bismuth titanate(Bi4Ti3O12、Bi12TiO20、Bi2Ti2O7)single phase polycrystalline samples were synthesized by the hydrothermal synthesis reaction method, and studied bismuth titanate Composite Materials doped with Gd3+. The structures and photocatalytic activity of these compounds were studied by X-ray diffraction(XRD), Ultraviolet Visible DiffuseReflectance Spectra(UV-vis), Scanning electron microscope and the measurement of photocatalytic activities.Bismuth titanate powder(Bi4Ti3O12、Bi12TiO20and Bi2Ti2O7)were synthesized in different reaction time by the hydrothermal synthesis reaction method. The products showed different size, degree of crystallization and photocatalytic activity with different proportion of Ti/Bi. The best hydrothermal reaction time of Bi4Ti3O12、Bi12TiO20and Bi2Ti2O7is16h、12h and24h. The Bii2TiO20composite powders by180℃hydrothermal synthesis showed high property, which degradated nearly100%rhodamine B in120min.Bismuth titanate Bi4Ti3O12、Bi12TiO20and Bi2Ti2O7Composite Materials doped with Gd3+were synthesized by hydrothermal synthesis method. Bi4Ti3O12and Bi12TiO20doped with Gd3+shows a high photocatalytic activity under visible light irradiation(A>400nm)in our experiment.When the doping amount of Gd3+is0.5%, Gd3+can enter the Bismuth titanate Bi4Ti3O12and Bi12TiO20lattice, and change the energy structure. The new bandwidth was appeared. Moreover, the photocatalytic activity of Gd3+doped mat-erials was much better than that of pure Bi4Ti3O12、Bi2Ti2O7and Bi12TiO20...