酸催化溶胶-凝胶法Eu2+、Gd3+共掺杂TiO2的制备及光催化活性

无机材料学报, 2008, 23(5): 1085-1088. doi: 10.3724/SP.J.1077.2008.01085

酸催化溶胶-凝胶法Eu²⁺、Gd³⁺共掺杂TiO₂的制备及光催化活性

1.1. 中南大学化学化工学院, 长沙 410083

2. 2. 长沙理工大学化学与环境工程学院, 长沙 410077

2. 2. College of Chemistry and Environment Engineering, Changsha University of Science and Technology, Changsha 410076, China

关键词：稀土 , codoping , synergetic effect , photocatalysis

Preparation and Photocatalysis Activity of Eu^2+/Gd³⁺ codoped Nano-TiO₂ Multiplex Photocatalyst from Sol-Gel Process Catalyzed with Acid

ZHOU Yi , HUANG Ke-Long , ZHU Zhi-Ping , YANG Bo , XIA Chang-Bin , XIAO Han-Ning

Keywords： rare earth , 共掺杂 , 协同效应 , 光催化

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.

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 Eu^2+/Gd³⁺ content and the minimum size appeares at 1% doped content. UV-Vis absorption spectra show
that Eu^3+/Gd³⁺ codoping can enhance the visible light response of the TiO₂. The photocatalyst activity of Eu^2+/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 Eu^2+/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.

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