Abstract
Abstract Praseodymium ion-doped TiO 2 (Pr 3+ -TiO 2 ) were prepared by the sol–gel method. The catalysts were characterized structurally by X-ray diffraction (XRD) and diffusive reflectance spectra (DRS) methods. The XRD results show that doped Pr ion could stabilize the anatase phase of TiO 2 and also inhibit the increase of the crystallite size. The DRS results show that the optical absorption edge slightly shifted to red direction owing to praseodymium ion doping, and Pr 3+ doped TiO 2 (Pr 3+ -TiO 2 ) catalysts had higher absorption peaks in the ultraviolet region. Pr 3+ -TiO 2 had better adsorption capacities and photocatalytic abilities for dye removal than that of pure TiO 2 . The optimum proportion of doped Pr ion for degradation of azo dye was 1.5% under UV light and 1.0% under visible light, at which best for dye photocatalytic degradation. The red shift of the optical adsorption edge of TiO 2 and visible light adsorption by Pr 3+ doping were the key factors that enhanced the photocatalytic activity of the catalysts when irradiated with visible light.
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