期刊
APPLIED CATALYSIS A-GENERAL
卷 284, 期 1-2, 页码 131-137出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2005.01.028
关键词
photocatalysts; visible-light sensitization; N-doped TiO2; wet-method N doping
Titanium dioxide powders prepared by a wet method, i.e., the hydrolysis of titanium tetra-isopropoxide or titanium tetrachloride with an aqueous ammonia solution. followed by calcination at temperatures above 330 degrees C, exhibit photocatalytic activity in the visible-light region owing to N doping. The maximum absorption of visible light by the N-doped TiO2 was about 50% at around 440 nm. Thermal analysis revealed that N doping occurs upon the oxidation of ammonia included in titanium hydroxide with lattice oxygen in TiO2. XPS analysis showed that the N doped in TiO2 is less than 1.3 at.% and is not bound directly to Ti. The oxidation state of doped N was found close to that of NO. Quantum yield for the CO photooxidation on the N-doped TiO2 in the visible region was less than that in UV region. These results show that the N doping by the wet method is similar to impurity doping such as metal ion doping. (c) 2005 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据