以TiCl_4和Na_2SiO_3为原料,采用水热法制备了一系列掺杂Si的纳米TiO_2粉体.采用X射线衍射分析(XRD),红外光谱(FT-IR),紫外可见吸收光谱(UV-vis DRS)对样品进行了表征.结果表明:掺杂Si的TiO_2样品粒径较小,样品中锐钛矿的百分含量有了一定提高.同时发现在Si掺杂的样品中有Ti-O-Si键的存在.掺杂Si的TiO_2样品的光催化活性较未掺杂样品有了较大提高.并讨论了Si掺杂提高TiO_2光催化活性可能的原因.
A series of Si-doped nanocrystalline titania powders were prepared by hydrothermal method using titanium tetrachloride (TiCl_4) and sodium silicate (Na_2SiO_3) as precursors. The photocatalysts were characterized by X-ray diffraction (XRD) analysis, fourier transform infrared spectroscopy (FT-IR), UV-vis diffuse reflectance spectrophotometer (UV-vis DRS). As the Si doped, photocatalysts with smaller crystal size, higher content of anatase phase were obtained. It was also found that Ti-O-Si band was formed in the Si-doped samples. The photocatalytic activity of Si-doped TiO_2 were improved compare with non-doped. The possible reasons of Si-doped for the enhanced photocatalytic activity was discussed.
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