Eu~(2+)/Gd~(3+)-codoped nanocrystalline titania catalyst and its photocatalytic activity under natur

• 作 者: 周艺 黄可龙 朱志平 夏畅斌
• 机 构: School of Chemistry and Chemical Engineering Central South University,School of Chemistry and Enviro
• 出 处: Transactions of Nonferrous Metals Society of China
• 发表日期: 2007年S1期
• 关键词: titania photocatalytic nanometer doping irradiation orange characterize pollutan

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.

Powder X-ray diffraction, Transmission electron microscopy and UV-Vis spectra 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 that Eu2 + / Gd3 + -codoped titania could be excited by natural light. The higher natural light activity is due to the codoping of Eu2 + / Gd3 + The optimum 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.