中文摘要：

以离子液体（[C4MIM]BF4）为模板剂,采用溶胶–凝胶法制备了介孔TiO2和Co掺杂的介孔TiO2光催化剂。研究了Co掺杂对样品的比表面积、晶相、元素价态、吸光特性及可见光活性的影响。结果表明：所制备的Co/TiO2光催化剂为介孔结构的具有较大比表面积的锐钛矿相纳米颗粒;XPS分析表明：Co以Co^2＋取代Ti^4＋进入TiO2晶格形成杂质能级,降低了TiO2带隙能,有效拓展了TiO2的光响应范围。以亚甲基蓝水溶液为降解对象,在可见光（λ〉420 nm）下考察制备样品的光催化活性,结果表明：Co掺杂的TiO2具有可见光活性,且0.3%Co/TiO2的活性最高。

英文摘要：

Co-doped mesoporous TiO2 photocatalysts were prepared by an ionic liquid 1-butyl-3-methylimida-zolium tetrafluoroborate（[C4MIM]BF4） modified Sol-Gel method. The effects of Co doping on the surface area, crystalline phase, chemical binding states and compositions, and absorbance of the Co-doped mesoporous TiO2 photocatalysts were studied by N2 adsorption-desorption measurements（BET）, X-ray diffraction（XRD）, X-ray photoelectron spectroscopy（XPS）, and UV-Vis diffuse reflectance absorption spectra（UV-Vis DRS）. BET analysis showed that Co/TiO2 photocatalyst was mesoporous structure with large surface area. XRD patterns indicated that the Co-doped mesoporous TiO2 photocatalysts was anatase structure. XPS spectra indicated that the Co2＋ replaced Ti4^＋ and entered into TiO2 lattice, which reduced the band gap of TiO2 and thereby extending the light response range to the visible region（UV-Vis spectra）. Photocatalytic activity of the Co/TiO2 mesoporous photocatalysts was evaluated by photodegradation of methylene blue（MB） under visible light（λ420 nm）. Co-doped TiO2 exhibited obvious visible light activity for MB photodegradation, and 0.3%Co/TiO2 exhibited the highest photocatalytic activity.