Silicon and aluminum co-doping of titania nanoparticles: Effect on thermal stability, particle size and photocatalytic activity

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• 作者：Dongchen Wu ; Fuwei Mao ; Zhihui Yang ; Shumei Wang ; Zhufa Zhou ; ^{zhouzhufa@suda.edu.cn" class="auth_mail}
• 关键词：Co-doping ; TiO2 ; Thermal stability ; Particle size ; Photocatalytic activity
• 刊名：Materials Science in Semiconductor Processing
• 出版年：July, 2014
• 年：2014
• 卷：23
• 期：Complete
• 页码：72-77
• 全文大小：1352 K

文摘

Silicon and aluminum co-doped titania (TiO₂) nanoparticles were fabricated by the sol-gel method. To investigate the effects of silicon and aluminum co-doping on thermal stability, microstructure and photocatalytic activity of TiO₂ nanoparticles. Six batches of silicon-aluminum doped samples were characterized by X-ray diffraction (XRD), BET surface area measurement, scanning electron microscopy (SEM) and UV-vis absorption spectra. The photocatalytic activities were evaluated by the degradation of methylene blue (MB) under UV light irradiation. Experimental results revealed that silicon and aluminum co-doping helped to improve the crystal phase transition temperature of titania to 1200 掳C and also decrease the particle size at high calcination temperature. A significant blue-shift was observed in the spectrum of UV-vis absorption. Additionally, it was found that silicon and aluminum co-doping exhibited better photocatalytic activity. The formation defects from solid solution reaction between Si⁴⁺, Al³⁺ and TiO₂ effectively inhibits the crystal phase transition and grain growth of TiO₂ nanoparticles.