Effect of Co-Doped La3+/Halogen on Visible Light Photocatalytic Activity of TiO₂

Abstract:

La³⁺/halogen (F^-, Cl^- and Br^-) co-doped TiO₂ was synthesized by alkoxide hydrolysis method. The prepared La³⁺/halogen TiO₂ photocatalysts with anatase phases and rutile phases were characterized with XRD, EDS, TEM and surface area analytic technology. Methyl orange was used as model pollutants to evaluate its visible light photocatalytic activity. The results showed that the co-doping of La³⁺ and halogen ions improved the surface area of TiO₂. Compared with 450°C and 650°C, La³⁺/Cl^- and La³⁺/Br^- co-doped TiO₂ calcined at 550°C exhibited much higher photocatalytic activity. The optimal doping ratio of La³⁺/F^-, La³⁺/Cl^- and La³⁺/Br^- was 0.4, 0.6, and 0.5 ((wt%)/(wt%)), respectively. Moreover, the degradation ratio of methyl orange on La³⁺/halogen co-doped TiO₂ with the optimal ratio were all higher than the maximum degradation ratio on La³⁺, F^-, Cl^- and Br^- doped TiO₂ prepared by the same method.

• Periodical: Advanced Materials Research (Volumes 239-242)
• Pages: 1923-1928
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.239-242.1923
• Online since: May 2011
• Authors: Qian Lin Chen, Yuan Wang, Chun Yan Zhong, Yu Guo
• Keywords: Doping, Halogen, TiO₂, Visible Light Photocatalysis

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