Surface Properties and Photocatalytic Activity of Pr3+-Doped TiO2 Nano-Powders

doi:10.7517/j.issn.1674-0475.2006.04.276

Abstract

Abstract: Pure and Pr³⁺-doped TiO₂ nano-powders with different doping contents were prepared by an acid-catalyzed sol-gel method using Ti(OC₄H₉)₄ and Pr(NO₃)₃ as precursors and characterized by XRD,BET,XPS and SPS techniques.The effects of Pr³⁺-doping content and calcination temperature on the photocatalytic activity for photocatalytic degradation of methylene blue(MB) in aqueous solution,phase structure,crystallite size and surface texture properties of the nano-powders were investigated.The surface composition and surface photovoltaic properties of the nano-particles were also studied.The mechanism of enhancement in their photocatalytic activity was also discussed.The results indicate that Pr³⁺-doping can enhance the photocatalytic activity of TiO₂ nano-powders as compared with pure TiO₂.1.25% Pr³⁺-doped TiO₂ nano-powders calcined at 600 ℃ for 2 h show the highest photocatalytic activity.The presence of Pr³⁺ in TiO₂ can strongly inhibit the phase transformation from anatase to rutile,and reduce crystallite size,and enlarge specific surface area,and increase the contents of both surface hydroxyl groups and adsorbed oxygen,and enhance separation efficiency of photo-generated electron-hole pairs,and improve the light adsorption properties of the particle surface as well,which result in the enhancement in the photocatalytic activity.

Key words: nano-sized titania, Pr³⁺-doping, surface property, photocatalytic activity

CLC Number:

O643

JIANG Hong-quan, WANG Peng, CHEN Hong-yan, YU Kai. Surface Properties and Photocatalytic Activity of Pr³⁺-Doped TiO₂ Nano-Powders[J]. Imaging Science and Photochemistry, 2006, 24(4): 276-285.

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Surface Properties and Photocatalytic Activity of Pr³⁺-Doped TiO₂ Nano-Powders

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