Department of Chemistry, Anna University, Chennai 600 025, India.
J Hazard Mater. 2011 Feb 28;186(2-3):1183-92. doi: 10.1016/j.jhazmat.2010.11.124. Epub 2010 Dec 4.
Sol-gel method was used to synthesize Zr(4+), La(3+) and Ce(3+) doped mesoporous TiO(2) 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 Zr(4+) ion into the lattice of TiO(2), and surface binding nature of La(3+) and Ce(3+) ions on mesoporous TiO(2). 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 TiO(2) was evaluated using aqueous alachlor as a model pollutant. It was found that 1 wt% Ce(3+) doped mesoporous TiO(2) exhibited higher activity than pure and other metal ions doped mesoporous TiO(2). The change of oxidation state of Ce(3+) is suggested to be the cause for enhanced photocatalytic activity.
采用溶胶-凝胶法，以三嵌段共聚物为模板，在乙醇/水介质中合成了不同重量百分比（0.5、1.0、2.0 和 3.0wt%）的Zr(4+)、La(3+)和Ce(3+)掺杂介孔 TiO(2)材料。表征结果表明，Zr(4+)离子进入 TiO(2)晶格发生同晶取代，La(3+)和 Ce(3+)离子以表面结合的方式存在于介孔 TiO(2)上。微观检查证实了表面吸附了可以改变颗粒形态的外来离子。颗粒尺寸小于 20nm。采用水相中莠去津作为模型污染物评价了金属离子掺杂介孔 TiO(2)的光催化活性。结果表明，1wt%Ce(3+)掺杂介孔 TiO(2)的活性高于纯介孔 TiO(2)和其他金属离子掺杂介孔 TiO(2)。Ce(3+)价态的变化被认为是提高光催化活性的原因。
