Nitrogen-doped titanium dioxide visible light photocatalyst: Spectroscopic identification of photoactive centers
Nitrogen-doped titanium dioxide visible light photocatalyst: Spectroscopic identification of photoactive centers
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DOI：
10.1016/j.jcat.2010.07.033
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发表时间：
2010-12
影响因子：
7.3
通讯作者：
Zizhong Zhang;Xuxu Wang;Jinlin Long;Quan Gu;Z. Ding;Xianzhi Fu
中科院分区：
文献类型：
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作者：
Zizhong Zhang;Xuxu Wang;Jinlin Long;Quan Gu;Z. Ding;Xianzhi Fu
本文重点研究了氮掺杂TiO 2可见光催化剂的光活性中心。采用后氮化法在400-800°C温度范围内制备了一系列N掺杂TiO 2材料。以丙酮的光催化氧化为模型反应，考察了材料的光催化性能。利用近边X射线吸收精细结构、X射线光电子能谱和电子顺磁共振谱对掺杂氮物种的化学状态进行了表征。结果表明，四种氮物种在TiO 2中单独存在或共同存在，这取决于氮化温度。材料的光活性中心是含有氧空位和氮阴离子的抗磁性[O-Ti 4 +-N3−-Ti 4 +-V 0-]簇。N掺杂TiO 2的可见光发射是由表面[Ti4+-N3−]单元的激发态引发的。
This paper focuses on the photoactive centers of nitrogen-doped TiO2visible light photocatalyst. A series of N-doped TiO2materials were prepared by a post-nitridation route at the temperature range of 400–800°C. The photocatalytic oxidation of acetone as a model reaction was used to evaluate the photocatalytic properties of the materials. The chemical states of doped nitrogen species were characterized by near-edge X-ray absorption fine structure, X-ray photoelectron, and electron paramagnetic resonance spectroscopies. The results reveal that four types of N species exist alone or together in TiO2depending on nitridation temperature. The photoactive centers of the materials are a diamagnetic [O–Ti4+–N3−–Ti4+–V0-] cluster containing an oxygen vacancy and a nitrogen anion. The visible light photocatalysis of N-doped TiO2is proposed to be initiated by an excited state of the surface [Ti4+–N3−] unit.