Visible light active N-doped TiO2 prepared from different precursors: Origin of the visible light absorption and photoactivity
Visible light active N-doped TiO2 prepared from different precursors: Origin of the visible light absorption and photoactivity
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由不同前驱体制备的可见光活性 N 掺杂 TiO2：可见光吸收和光活性的起源
DOI：
10.1016/j.apcatb.2011.03.020
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发表时间：
2011-05
影响因子：
22.1
通讯作者：
Zhang, Zhijun
中科院分区：
文献类型：
--
作者：
Wang, Yan;Feng, Caixia;Zhang, Min;Yang, Jianjun;Zhang, Zhijun
分别采用纳米管钛酸（NTA）、原料P25-TiO2和新型TiO2三种前驱体，通过在流动NH3中退火制备可见光活性N掺杂TiO2样品，旨在揭示可见光响应的决定因素。通过X射线衍射(XRD)、X射线光电子能谱(XPS)、漫反射光谱(DRS)和电子自旋共振(ESR)研究了所得N掺杂TiO2样品的物理化学性质。通过监测丙烯的光催化氧化，比较了三种N掺杂样品的可见光光催化活性。结果发现，以NTA为前驱体得到的N掺杂TiO2催化剂具有最高的光催化活性。在 2.34-2.53 eV 可见光谱区观察到的吸收边与单电子俘获氧空位（表示为 SETOV，即 F+色心）密切相关，而 2.95-3.10 处的另一个吸收边则归属于本征吸收。 N掺杂TiO2的可见光敏化是由于NH3处理过程中SETOV的形成，并且掺杂N起到阻止光生电子和空穴复合的作用，从而产生可见光光催化活性。由不同前驱体制成的 N 掺杂 TiO2 样品具有不同的 SETOV 浓度，因此可见光催化性能不同。
Three kinds of precursors, nanotubular titanic acid (denoted as NTA), raw P25-TiO2and novel-TiO2, were separately used to prepare visible light active N-doped TiO2samples by annealing in flowing NH3, aiming to reveal the determinative factors on visible light response. The physicochemical properties of resultant N-doped TiO2samples were investigated by means of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), diffuse reflectance spectra (DRS), and electron spin resonance (ESR). The visible light photocatalytic activity of the three kinds of N-doped samples was compared by monitoring the photocatalytic oxidation of propylene. It was found that N-doped TiO2catalyst obtained by using NTA as the precursor possessed the highest photocatalytic activity. The absorption edge observed in the visible spectral region of 2.34–2.53 eV is closely related with single-electron-trapped oxygen vacancy (denoted as SETOV, i.e.,F+color centers), while another absorption edge at 2.95–3.10 is assigned to the intrinsic absorption. The visible light sensitization of N-doped TiO2was due to the formation of SETOV in NH3-treatment process, and doped-N played a role in preventing photogenerated electrons and holes from recombination, resulting in visible light photocatalytic activity. N-doped TiO2samples made from different precursors had different concentrations of SETOV and hence different visible light photocatalytic performance.
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影响因子：
15
作者：
R. Iyengar;M. Codell;J. Karra;J. Turkevich
通讯作者：
R. Iyengar;M. Codell;J. Karra;J. Turkevich
影响因子：
--
作者：
Yan Wang;Caixia Feng;Zhensheng Jin;Jiwei Zhang;Jianjun Yang;S. Zhang
通讯作者：
Yan Wang;Caixia Feng;Zhensheng Jin;Jiwei Zhang;Jianjun Yang;S. Zhang
影响因子：
22.1
作者：
D'Arienzo, Massimiliano;Scotti, Roberto;Morazzoni, Franca
通讯作者：
Morazzoni, Franca
影响因子：
3.3
作者：
S. Livraghi;A. Czoska;M. Paganini;E. Giamello
通讯作者：
S. Livraghi;A. Czoska;M. Paganini;E. Giamello
影响因子：
3.7
作者：
A. Emeline;N. Sheremetyeva;N. V. Khomchenko;V. Ryabchuk;N. Serpone
通讯作者：
A. Emeline;N. Sheremetyeva;N. V. Khomchenko;V. Ryabchuk;N. Serpone