Eu2+/Gd3+-codoped nanocrystalline titania catalyst and its photocatalytic activity under natural light
来源期刊：中国有色金属学报(英文版)2007年增刊第1期(Part ⅡB)
论文作者：周艺 黄可龙 朱志平 夏畅斌
文章页码：1112 - 1116
Key words：titania catalysts; codoping; synergetic effect
Abstract: Eu2+/Gd3+-codoped nanocrystalline titania catalysts were prepared by a modified sol-gel method. Powder X-ray diffraction, Transmission electron microscopy and UV-Vis spectra analyse were carried out to characterize the catalysts with different Eu2+/Gd3+contents.The photocatalytic efficiency was evaluated by the photodegradation of methyl orange in an aqueous solution under natural light irradiation. It has been confirmed that Eu2+/Gd3+-codoped titania could be excited by natural light. The higher natural light activity is due to the codoping of Eu2+/Gd3+. An optimum synergetic effect was found for a mass ratio of Eu/TiO2 equal to 1.0% and Gd/TiO2 equal to 0.5%. The effects induced by Eu2+/Gd3+-codoped on the titania catalysts may be explained in terms of Gd3+→Eu2+ energy transfer to affect the photocatalysis activity of the titania catalysts.
基金信息：the National Natural Science Foundation of China
the Natural Science Foundation of Hunan Province, China
the Scientific Research Fund of Hunan Provincial Education Department, China
