Origin of visible-light-driven photocatalysis:: A comparative study on N/F-doped and N-F-codoped TiO2 powders by means of experimental characterizations and theoretical calculations
Origin of visible-light-driven photocatalysis:: A comparative study on N/F-doped and N-F-codoped TiO2 powders by means of experimental characterizations and theoretical calculations
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DOI：
10.1016/j.jssc.2005.08.008
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发表时间：
2005-11-01
影响因子：
3.3
通讯作者：
Haneda, H
中科院分区：
文献类型：
--
作者：
Li, D;Ohashi, N;Haneda, H
对喷雾热分解法合成的N掺杂、F掺杂和N-F共掺杂的TiO 2粉体（NTO、FTO、NFTO）进行了全面的比较研究，以阐明其可见光驱动发光的起源。通过XPS、UV-Vis、PL、NH_3-TPD和ESR等光谱分析，比较了它们的实验性质。它们的理论预测性质的比较是基于对计算的电子结构的分析。结果表明，N掺杂不仅改善了TiO 2的可见光吸收，而且产生了表面氧空位。F掺杂产生了一些有益的效果，包括表面氧空位的产生，表面酸性的增强和Ti 3+离子的增加。掺杂的N原子在TiO 2的价带上方形成了局域能态，而掺杂的F原子本身对能带结构没有影响。光催化实验表明，NFTO对乙醛和三氯乙烯的可见光降解活性最高。这种高活性归因于由N-F共掺杂诱导的几种有益效果的协同结果。(c)2005年爱思唯尔公司All rights reserved.
An overall comparative study was carried out on N-doped, F-doped, and N-F-codoped TiO2 powders (NTO, FTO, NFTO) synthesized by spray pyrolysis in order to elucidate the origin of their visible-light-driven photocatalysis. The comparisons in their experimentally obtained characteristics were based on the analysis of XPS, UV-Vis, PL, NH3-TPD and ESR spectra. The comparisons in their theoretically predicted properties were based on the analysis of the calculated electronic structures. As the results, N-doping into TiO2 resulted in not only the improvement in visible-light absorption but also the creation of surface oxygen vacancies. F-doping produced several beneficial effects including the creation of surface oxygen vacancies, the enhancement of surface acidity and the increase of Ti3+ ions. Doped N atoms formed a localized energy state above the valence band of TiO2, whereas doped F atoms themselves had no influence on the band structure. The photocatalytic tests indicated that the NFTO demonstrated the highest visible-light activity for decompositions of both acetaldehyde and trichloroethylene. This high activity was ascribed to a synergetic consequence of several beneficial effects induced by the N-F-codoping. (c) 2005 Elsevier Inc. All rights reserved.