Enhanced photocatalytic activity of (La, N) co-doped TiO₂ by TiCl₄ sol-gel autoigniting synthesis

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• 作者：Zhongqing Liu ; Yanping Zhou ; Zhenghua Li ; Yichao Wang ; Changchun Ge
• 关键词：photocatalyst ; co-doping ; titanium dioxide ; sol-gel autoigniting synthesis ; photocatalytic activity
• 刊名：Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material
• 出版年：2007
• 出版时间：December 2007
• 年：2007
• 卷：14
• 期：6
• 页码：552-557
• 全文大小：562 K

文摘

(La, N) co-doped TiO₂ photocatalysts were synthesized using TiCl₄ sol-gel autoigniting synthesis (SAS) starting from a complex compound system of TiCl₄-La(NO₃)₃-citric acid-NH₄NO₃-NH₃.H₂O, in which the (La, N) co-doped process was accomplished in the formation of TiO₂ nanocrystals. The prepared samples were characterized by using X-ray diffraction (XRD), X-ray photoemission spectroscopy (XPS) and UV-vis diffuse reflectance spectra. The results indicated that nitrogen and lanthanum were incorporated into the lattice and interstices of titania nanocrystals, which resulted in narrowing the band gap and promoting the separation of photoexcited hole-electron pairs, respectively, and showing expected red-shifts and enhanced photocatalytic activity under visible light. The mechanism on nitrogen doping and enhancement in photocatalytic activity of (La, N) co-doped titania by SAS was discussed in detail.