Synthesis of well ordered mesoporous Yb, N co-doped TiO₂ with superior visible photocatalytic activity

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• 作者：Yunfei Ma ; Mingyang Xing ; Jinlong Zhang ; ^{jlzhang@ecust.edu.cn} ; Baozhu Tian ; Feng Chen
• 关键词：Mesoporous titanium dioxide ; Visible light activity ; Ytterbium ; Nitrogen ; Co-doped
• 刊名：Microporous and Mesoporous Materials
• 出版年：2012
• 期刊代码：78_13871811
• 类别：ch
• 出版时间：1 July, 2012
• 卷：156
• 期：Complete
• 页码：145-152
• 文件大小：1496 K

摘要

Well-ordered mesoporous TiO₂ co-doped with nitrogen and ytterbium was successfully synthesized by an evaporation-induced self-assembly process. The as-prepared and calcined mesoporous TiO₂ materials were characterized by X-ray diffraction, transmission electron microscope, UV-vis absorbance spectroscopy, X-ray photoelectron spectroscopy, fourier transform infrared and N₂ adsorption-desorption measurements. After calcinations at 350 掳C, the TiO₂ co-doped with nitrogen and 3%ytterbium had the highest surface area (219 m² g^鈭?) and retained ordered structures. Under visible light irradiation, 75%of 20 mg/L phenol solution was degraded after 10 h and 10 mg/L rhodamine B (RhB) was decomposed completely after 4 h. The significant enhancement in the photocatalytic activity of the modified TiO₂ is attributed to the synergistic effect of N and Yb. The N dopant extended the absorption to visible region and the Yb dopant was beneficial in stabilizing the mesoporous structure and restraining the recombination of photogenerated holes and electrons.