Mo plus C Codoped TiO2 Using Thermal Oxidation for Enhancing Photocatalytic Activity
Mo plus C Codoped TiO2 Using Thermal Oxidation for Enhancing Photocatalytic Activity
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DOI：
10.1021/am100011c
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发表时间：
2010-04-01
影响因子：
9.5
通讯作者：
Xiong, Rui
中科院分区：
文献类型：
--
作者：
Zhang, Jun;Pan, Chunxu;Xiong, Rui
TiO 2光催化活性的提高主要是通过增强对紫外维斯光的吸收和提高光生电子和空穴的分离效率来实现的。最新的理论研究表明，Mo + C共掺杂的TiO 2被认为是最佳的掺杂体系。在此理论基础上，首次采用热氧化法合成了Mo + C共掺杂的TiO 2粉体。X射线衍射和X射线光电子能谱分析表明，在TiO 2中，碳（C）以Ti-O-C的能带结构存在，钼（Mo）以Mo 6+的形式存在。Mo+C共掺杂的TiO 2的光谱起始点比纯TiO 2红移了32 nm，带隙从3.20 eV减小到2.97 eV。Mo + C共掺杂TiO 2的光电流比纯TiO 2提高了约4倍，提高了其光催化降解亚甲基蓝的活性。
The photocatalytic activity of TiO2 is enhanced mainly through heightening absorption of UV vis light and improving the separation efficiency of photoinduced electrons and holes. The recent new theoretical research revealed that the TiO2 codoped with Mo + C is considered to be an optimal doping system. On the basis of this theory, the Mo + C codoped TiO2 powders were first experimentally synthesized by thermal oxidizing a mixture of TiC and MoO3 powders in the air. The XRD patterns and the XPS survey spectrum showed that carbon (C) acted as a Ti-O-C band structure and molybdenum (Mo) existed as Mo6+ in anatase TiO2. The Mo+C codoped TiO2 had a 32 nm red shift of the spectrum onset compared with pure anatase TiO2, and its band gap was reduced from 3.20 to 2.97 eV. The photocurrent of the Mo + C codoped TiO2 was about 4 times as high as that of pure anatase TiO2, and its photocatalytic activity on decomposition of methylene blue was enhanced.