Preparation、Characterization and Photocatalytic Activities of Low Amount La3+-doped S-TiO2 Photocatalysts

doi:10.7517/j.issn.1674-0475.2009.01.38

Abstract

Abstract: La³⁺/S-TiO₂ were prepared by sol-gel-impregnation method and characterized by means of XRD、BET、XPS and UV-Vis.Activities of prepared nano-photocatalysts were evaluated by decolorizing methyl orange solution as model compound to photocatalytic degradation.The mechanisms of effects of low amount La³⁺-doping on the photocatalytic activity of TiO₂ nano-particles were discussed.The results show that S-doping can significantly enhance the photocatalytic activity of TiO₂ nano-particles and La³⁺doped S-TiO₂ can further enhance the photocatalytic activity of TiO₂ nanoparticles.Under optimal addition amount of La³⁺ into TiO₂ 0.369%(mass fraction),decolorizing rate of methyl orange on La³⁺/S-TiO₂ nano-photocatalyst was 92.4% after 120 min irradiation.The analytical results of XRD show that the presence of low amount of La³⁺in TiO₂ can inhibit the phase transformation from anatase to rutile,suppress the growth of TiO₂ grains and raise the specific surface area.The analytical results of XPS indicate that S、La³⁺ doping can result in the increase in the density of the surface hydroxyl,and cationic S⁶⁺ is incorporated into TiO₂ lattice and substitutes a part of Ti⁴⁺.The analytical results of UV-Vis indicate that the La³⁺/S-TiO₂ catalyst has stronger absorption in the ultraviolet region than the pure TiO₂.Compared with pure TiO₂,the enhanced photocatalytic activity of the La³⁺ doped TiO₂ nano-powders can be due to the increase of the density of the surface hydroxyl and the specific surface area,and the improvement of the ultraviolet light absorption properties of the particle surface.

Key words: photocatalysis, TiO₂, La³⁺-doping, methyl orange

CLC Number:

O643

LI Hui-quan, FAN Yi-ning, DONG Kun-ming, JIN Feng, CHEN Shui-sheng. Preparation、Characterization and Photocatalytic Activities of Low Amount La³⁺-doped S-TiO₂ Photocatalysts[J]. Imaging Science and Photochemistry, 2009, 27(1): 38-47.

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Preparation、Characterization and Photocatalytic Activities of Low Amount La³⁺-doped S-TiO₂ Photocatalysts

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