Preparation of Sb_2O_3-doped TiO_2 by Hydrothermal Method and the Inhibition of Photocatalytic Activity

Two kinds of Sb2O3-doped TiO2(Sb2O3:TiO2=0-0.35mol%) nano-particles were synthesized by the hydrothermal method at 200℃ for 6h. The first kind of Sb2O3-doped TiO2 was prepared by using titania and antimony trichloride as reactants. The second kind of Sb2O3-doped TiO2 was prepared by using metatitanic acid and antimony trichloride as reactants. The Sb2O3doped TiO2 powders were characterized by XRD, SEM, EDS, TG, IR and the diameter of the particles was evaluated by Scherrer equation. EDS characterization shows that Sb2O3 exists in Sb2O3-doped TiO2. The crystallines of all samples are anatase in XRD patterns. The dopant of Sb2O3 can inhibit the particle growth of the second kind of Sb2O3-doped TiO2 when the crystalline . is changed into anatase TiO2. The photocatalytic activities of the two kinds of Sb2O3-doped TiO2 were characterized by photodegradation of rhodamine B. The photocatalytic activity of Sb2O3doped TiO2 is effectively suppressed by the doping of Sb2O3. When Sb2O3:TiO2 is 0.21%, the photocatalytic activity of Sb2O3-doped TiO2 is the lowest. The photocatalytic activity of the second kind of Sb2O3-doped TiO2 is lower than that of the first.