文献类型：期刊文献

英文题名：New approaches to prepare nitrogen-doped TiO₂ photocatalysts and study on their photocatalytic activities in visible light

作者：Xing, Mingyang;Zhang, Jinlong[1];Chen, Feng

机构：[1]E China Univ Sci & Technol, Adv Mat Lab, Shanghai 200237, Peoples R China; E China Univ Sci & Technol, Inst Fine Chem, Shanghai 200237, Peoples R China

年份：2009

卷号：89

期号：3-4

起止页码：563

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENTAL

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000267203200034)】；

基金：This work has been supported by Science and Technology Commission of Shanghai Municipality (07JC14015); Shanghai Nanotechnology Promotion Centre (0752nm001), National Nature Science Foundation of China (20773039): National Basic Research Program of China (973 Program, 2007CB613301, 2004CB719500), and the Ministry of Science and Technology of China (2006AA06Z379, 2006DFA52710).

语种：英文

外文关键词：N-TiO2; pH; Photocatalytic degradation; Nitrogen states

摘要：Nitrogen-doped TiO2 nanocatalysts were successfully synthesized by adjusting a pH range using the ammonium nitrate and ammonia water as the nitrogen source. The samples were characterized by XRD, XPS and UV-DRS. When the total amount of ammonium nitrate and ammonia water was unchanged, different pH values were modified by changing the NH4NO3/NH3 center dot H2O ratio to prepare nitrogen-doped TiO2. The prepared photocatalyst showed the highest photo-activity for the degradation of 2,4-dichlorophenol (2,4-DCP) under visible light when prepared at pH 5.87. XPS analysis showed the presence of nitrogen in two states doped in TiO2. The results indicated the photocatalytic activity of N-TiO2 is varied with the change of pH values, the amount of the nitrogen sources and water. The experimental results showed that the higher activity is due to the variation in the concentration and states of nitrogen-doped in TiO2. In the preparation methods, the photocatalyst was treated with the hydrogen peroxide before calcination, resulting in the decrease of nitrogen doped into the lattice and the photo-degradation rate of 2,4-DCP. The results suggested that the nitrogen source could be doped into the crystal lattice only in the form of reduction state as NH4+ ion during the calcination process. (C) 2009 Elsevier B.V. All rights reserved.