无机材料学报

• 研究论文 • 上一篇    

酸催化溶胶-凝胶法Eu2+、Gd3+共掺杂TiO2的制备及光催化活性

周 艺1, 2,黄可龙1, 朱志平1, 2, 杨 波2, 夏畅斌2, 肖汉宁2   

  1. 1. 中南大学化学化工学院, 长沙 410083; 2. 长沙理工大学化学与环境工程学院, 长沙 410077
  • 收稿日期:2008-01-03 修回日期:2008-05-29 出版日期:2008-09-20 网络出版日期:2008-09-20

Preparation and Photocatalysis Activity of Eu2+/Gd3+ codoped Nano-TiO2 Multiplex Photocatalyst from Sol-Gel Process Catalyzed with Acid

ZHOU Yi1, 2, HUANG Ke-Long1, ZHU Zhi-Ping1, 2, YANG Bo2, XIA Chang-Bin2, XIAO Han-Ning2   

  1. 1. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China; 2. College of Chemistry and Environment Engineering, Changsha University of Science and Technology, Changsha 410076, China
  • Received:2008-01-03 Revised:2008-05-29 Published:2008-09-20 Online:2008-09-20

摘要: 采用酸催化溶胶-凝胶法制备了Gd3+、Eu2+两种稀土金属离子混合掺杂的复合TiO2光催化剂, 通过TEM、XRD、UV-Vis等分析手段对产物进
行了表征, 结果表明: 样品均呈锐钛矿型结构, 颗粒尺寸的变化只与掺杂离子总量有关, 掺杂量为1.0%时达最小值; 一定比例Eu2+、Gd3+的混合掺杂, 能增强可见光范围内光响应. 以甲基橙为目标降解物研究了不同比例Eu2+、Gd3+混合掺杂对纳米二氧化钛光催化活性的影响, Gd3+、Eu2+适合掺杂量范围分别为0.1%~1.0%和0.5%~1.5%. Eu2+、Gd3+混和掺入TiO2光催化剂中产生协同效应, 探讨了Eu2+和Gd3+与TiO2之间的相互作用, 讨论了光催化活性与催化剂性质的关系.

关键词: 稀土, 共掺杂, 协同效应, 光催化

Abstract: A new nano-TiO2 multiplex photocatalyst codoped with Eu2+ and Gd3+ was prepared by a modified acidic sol-gel process. TEM and XRD results demonstrate that as-produced samples are anatase structure, and the crystallite size has relationship
only with total doped Eu2+/Gd3+ content and the minimum size appeares at 1% doped content. UV-Vis absorption spectra show
that Eu3+/Gd3+ codoping can enhance the visible light response of the TiO2. The photocatalyst activity of Eu2+/Gd3+ codoped TiO2 is evaluated by photodegradation of methyl orange in an aqueous solution under natural light irradiation, A synergetic effect is observed due to Eu2+/Gd3+ codoping, and the optimal doping concentration for Gd3+ and Eu2+ are in the range from 0.1% to 1.0% and 0.5% to 1.5% respectively. The relationship and function between Eu2+, Gd3+ and TiO2 are also discussed.

Key words: rare earth, codoping, synergetic effect, photocatalysis

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