稀土掺杂纳米二氧化钛光催化剂的研究进展

Recent progress on rare earth elements doped nano-titanium dioxide photocatalysts

纳米二氧化钛(TiO2)催化剂由于其高效、价廉、无毒、稳定等优点,被认为是一种极具应用前景的环境友好型光催化材料,它在空气净化、环境治理、光解水制氢、废水处理等环保领域得到了广泛的研究和应用。在对TiO2改性研究中发现,稀土金属掺杂是较为有效和经济的手段,稀土离子的掺入不仅可以提高对有机污染物吸附量,还可以延迟锐钛矿相向金红石相的转变,增强TiO2的光催化性能。目前,有关稀土掺杂TiO2的综合性报道较少。本文简单介绍了稀土掺杂纳米TiO2提高其光催化性能的机理,从单一稀土元素掺杂、稀土元素与其他元素共掺杂、稀土元素与稀土元素共掺杂纳米TiO2光催化剂3个方面阐述了稀土掺杂纳米TiO2光催化剂的研究进展,并在最后指出了稀土掺杂纳米TiO2中存在的问题和未来的研究方向。

Nano-Titanium dioxide, because of its advantages of high event, cheap, nontoxic, stable. Among all kinds of photocatalysts, nano-titanium dioxide is considered as one of the most promising environmental-friendly materials, nano-titanium oxide has been extensively applied for air purification, sterilization. For the research of the modification of titanium dioxide, doping with rare earth metals is a more effective and economical means. It was found rare earth elements doping can not only improved the adsorption capacity of organic pollutants, but also retarded the phase transformation from anatase to rutile andenhance the photocatalytic activity of TiO2 catalysts.At present, there are few comprehensive reports about rare earth doped TiO2. This paper describes the principl of rare earth doped nanometer TiO2 improve its photocatalytic performance. The research advances of rare earth single-element doping and co -doping with other elements and co-doping with rare earth element are discussed in detail. Current existing problems and future developing trends in this area are also discussed.