Visible light absorption ability and photocatalytic oxidation activity of various interstitial N-doped TiO2 prepared from different nitrogen dopants
Visible light absorption ability and photocatalytic oxidation activity of various interstitial N-doped TiO2 prepared from different nitrogen dopants
复制标题
DOI：
10.1016/j.jhazmat.2009.02.036
复制
发表时间：
2009-08-30
影响因子：
13.6
通讯作者：
Seraphin, Supapan
中科院分区：
文献类型：
--
作者：
Ananpattarachai, Jirapat;Kajitvichyanukul, Puangrat;Seraphin, Supapan
氮掺杂TiO2被开发用于利用太阳光谱的可见范围进行光催化反应。本文报道了采用二乙醇胺、三乙胺和尿素三种不同类型的氮掺杂剂，采用溶胶-凝胶法制备的间隙型氮掺杂TiO2的合成、表征和动力学研究。采用x射线衍射、扫描电镜、透射电镜、x射线光电子能谱和紫外可见光谱对二氧化钛进行了分析。不同的氮掺杂可以获得不同的间质n掺杂TiO2的性能，如在紫外-可见光区域的吸收能力、吸附边的红移、钛结构（锐钛矿和金红石）的良好结晶和组成比例。在所研究的氮前驱物中，二乙醇胺提供了最高的可见光吸收能力，具有最小的能带隙和最小的锐钛矿晶体尺寸，从而使2-氯苯酚的降解效率最高。所有n掺杂TiO2的光催化活性可以按照以下顺序排列：TiO2/二乙醇胺> TiO2/三乙胺> TiO2/尿素>未掺杂TiO2。二乙醇胺对2-氯酚的初始降解速率为0.59 mg/L-min，动力学常数为2.34 × 10(-2) min(-1)，半衰期为98 min。在所有情况下，对苯二酚被检测为2-氯酚降解的主要中间体。(C) 2009 Elsevier B.V.版权所有
Nitrogen-doped TiO2 was developed to enable photocatalytic reactions using the visible range of the solar spectrum. This work reports on the synthesis, characterisation and kinetic study of interstitial N-doped TiO2 prepared by the sol-gel method using three different types of nitrogen dopants: diethanolamine, triethylamine and urea. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and UV-visible spectroscopy were used to analyse the titania. Different interstitial N-doped TiO2 properties, such as absorption ability in the UV-visible light region, redshift in adsorption edge, good crystallisation and composition ratio of titania structures (anatase and rutile) could be obtained from different nitrogen dopants. Amongst investigated nitrogen precursors, diethanolamine provided the highest visible light absorption ability of interstitial N-doped TiO2 with the smallest energy bandgap and the smallest anatase crystal size, resulting in the highest efficiency in 2-chlorophenol degradation. The photocatalytic activity of all N-doped TiO2 can be arranged in the following order: TiO2/diethanolamine > TiO2/triethylamine > TiO2/urea > un-doped TiO2. The initial rate of 2-chlorophenol degradation using the interstitial N-doped TiO2 with diethanolamine was 0.59 mg/L-min and the kinetic constant was 2.34 x 10(-2) min(-1) with a half-life of 98 min. In all cases, hydroquinone was detected as a major intermediate in the degradation of 2-chlorophenol. (C) 2009 Elsevier B.V. All rights reserved.