Preparation of highly active photocatalyst anatase TiO2 by mixed template method |
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Authors: | Shanxia Luo Fumin Wang Zhansheng Shi Feng Xin |
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Affiliation: | (1) School of Chemical Engineering and Technology, Tianjin University, 300072 Tianjin, People’s Republic of China |
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Abstract: | 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 as a model reaction. The results showed that TiO2 photocatalysts with mixed template have higher photocatalytic activity than P25. |
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Keywords: | TiO2 Photocatalyst Template PEG CTAB Photocatalytic activity |
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