New approaches to prepare nitrogen-doped TiO2 photocatalysts and study on their photocatalytic activities in visible light
New approaches to prepare nitrogen-doped TiO2 photocatalysts and study on their photocatalytic activities in visible light
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氮掺杂TiO2光催化剂的制备新方法及其可见光催化活性研究
DOI：
10.1016/j.apcatb.2009.01.016
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发表时间：
2009-07
影响因子：
22.1
通讯作者：
Zhang, Jinlong
中科院分区：
文献类型：
--
作者：
Xing, Mingyang;Chen, Feng;Zhang, Jinlong
以硝酸铵和氨水为氮源，通过调节pH范围，成功地合成了掺氮纳米二氧化钛催化剂。用X射线衍射仪、X射线光电子能谱和UV-DRS对样品进行了表征。在保持硝酸铵和氨水总量不变的情况下，通过改变NH4NO3/NH3·H2O的比例来改变不同的pH值，制备氮掺杂的二氧化钛。当pH为5.87时，制备的光催化剂在可见光下对2，4-二氯苯酚(2，4-DCP)的降解活性最高。XPS分析表明，二氧化钛中氮以两种状态存在。结果表明，N-TiO2的光催化活性随pH值、氮源用量和水量的变化而变化。实验结果表明，较高的活性是由于二氧化钛中氮的掺杂浓度和状态的变化所致。在制备方法中，光催化剂在焙烧前用过氧化氢处理，减少了氮的掺杂量，降低了2，4-DCP的光降解率。结果表明，氮源在焙烧过程中只能以还原状态NH4+离子的形式掺杂到晶格中。
Nitrogen-doped TiO2nanocatalysts 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·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-TiO2is 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.
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影响因子：
5.4
作者：
E. György;Á. D. Pino;P. Serra;J. Morenza
通讯作者：
E. György;Á. D. Pino;P. Serra;J. Morenza
DOI：
10.1016/s1010-6030(97)00208-6
发表时间：
1997-11-15
影响因子：
4.3
作者：
Nakaoka, Y;Nosaka, Y
通讯作者：
Nosaka, Y
影响因子：
5.5
作者：
S. Joung;T. Amemiya;M. Murabayashi;K. Itoh
通讯作者：
S. Joung;T. Amemiya;M. Murabayashi;K. Itoh
影响因子：
3.3
作者：
Gole, JL;Stout, JD;Chen, XB
通讯作者：
Chen, XB
影响因子：
8.8
作者：
Zhongqing Liu;Yanping Zhou;Zhenhua Li;Yichao Wang;C. Ge
通讯作者：
Zhongqing Liu;Yanping Zhou;Zhenhua Li;Yichao Wang;C. Ge