Preparation of highly active photocatalyst anatase TiO₂ by mixed template method

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• 作者：Shanxia Luo ; Fumin Wang ; Zhansheng Shi and Feng Xin
• 关键词：TiO2 ; Photocatalyst ; Template ; PEG ; CTAB ; Photocatalytic activity
• 刊名：Journal of Sol-Gel Science and Technology
• 出版年：2009
• 出版时间：October, 2009
• 年：2009
• 卷：52
• 期：1
• 页码：1-7
• 全文大小：538.0 KB

文摘

TiO₂ nanocrystals with diameters 8–10 nm have been prepared through sol–gel method using a mixed template of polyethylene glycol (PEG) and cetytrimethylammonium bromide (CTAB) at low temperature. The samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution (HR) TEM and fourier transform infrared spectroscopy (FT-IR) etc. XRD analysis showed the TiO₂ photocatalysts prepared with mixed template are pure anatase. FTIR spectrum revealed that the cationic surfactant provides CTA+ molecules and bonds to Ti–O to prevent the condensation reaction. PEG plays a dispersant role in controlling the structure of nano-TiO₂ particles. CTAB and PEG incorporated with each other to restrain the growth of crystal nucleus and control the size of grain. The self-assembling process has been confirmed by HRTEM. PEG played different role in mixed template from the single template. The photocatalytic activity of samples was determined by using 3\textI - ? \textI₃ - + 2\texte - 3{\text{I}}^{ - } \to {\text{I}}_{3}^{ - } + 2{\text{e}}^{ - } as a model reaction. The results showed that TiO₂ photocatalysts with mixed template have higher photocatalytic activity than P25.