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.
周 艺
,
黄可龙1
,
朱志平
,
杨 波
,
夏畅斌
,
肖汉宁
. 酸催化溶胶-凝胶法Eu2+、Gd3+共掺杂TiO2的制备及光催化活性[J]. 无机材料学报, 2008
, 23(5)
: 1085
-1088
.
DOI: 10.3724/SP.J.1077.2008.01085
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.
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