Synthesis and characterization of Zr4+, La3+ and Ce3+ doped mesoporous TiO2: Evaluation of their photocatalytic activity
Synthesis and characterization of Zr4+, La3+ and Ce3+ doped mesoporous TiO2: Evaluation of their photocatalytic activity
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DOI：
10.1016/j.jhazmat.2010.11.124
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发表时间：
2011-02-28
影响因子：
13.6
通讯作者：
Murugesan, V.
中科院分区：
文献类型：
--
作者：
Kumaresan, L.;Prabhu, A.;Murugesan, V.
以三嵌段共聚物为结构导向模板剂，在乙醇/水介质中，采用溶胶-凝胶法合成了Zr 4+、La 3+和Ce 3+掺杂的介孔TiO 2材料，其质量分数分别为0.5，1.0，2.0和3.0%.表征结果表明，Zr 4+离子同晶取代到TiO 2的晶格中，La 3+和Ce 3+离子在介孔TiO 2上具有表面结合的性质。显微镜检查证实了外来离子的表面吸附，这可能会改变颗粒形态。颗粒的尺寸小于20 nm。以甲草胺水溶液为模型污染物，研究了金属离子掺杂介孔TiO 2的光催化活性。结果表明，Ce 3+掺杂量为1wt%的介孔TiO 2比纯的介孔TiO 2和掺杂其它金属离子的介孔TiO 2具有更高的催化活性。Ce 3+氧化态的改变是光催化活性增强的原因。(C)2010 Elsevier B. V.保留所有权利。
Sol-gel method was used to synthesize Zr4+, La3+ and Ce3+ doped mesoporous TiO2 materials with different weight percentage (0.5, 1.0, 2.0 and 3.0 wt%) using triblock copolymer as the structure directing template in ethanol/water medium. Characterization revealed the isomorphic substitution of Zr4+ ion into the lattice of TiO2, and surface binding nature of La3+ and Ce3+ ions on mesoporous TiO2. Microscopic examination confirmed the surface adsorption of foreign ion which could alter the particle morphology. The size of the particles was less than 20 nm. Photocatalytic activity of metal ions doped mesoporous TiO2 was evaluated using aqueous alachlor as a model pollutant. It was found that 1 wt% Ce3+ doped mesoporous TiO2 exhibited higher activity than pure and other metal ions doped mesoporous TiO2. The change of oxidation state of Ce3+ is suggested to be the cause for enhanced photocatalytic activity. (C) 2010 Elsevier B.V. All rights reserved.