| 激光闪光光解技术研究Pt4+掺杂提高TiO2光催化活性机制 |
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| 引用本文： | 李广勤,刘春艳,刘云.激光闪光光解技术研究Pt4+掺杂提高TiO2光催化活性机制[J].影像科学与光化学,2007,25(3):191-197. |
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| 作者姓名： | 李广勤 刘春艳 刘云 |
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| 作者单位： | 1. 中国科学院, 理化技术研究所, 北京, 100080;2. 中国科学院, 研究生院, 北京, 100039 |
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| 摘 要： | 通过用纳秒激光直接激发Pt4+掺杂的TiO2透明溶胶体系,研究了440 nm处O-吸收光谱的衰减过程.O-是被捕获的正空穴的信号,是光催化反应过程中产生OH.自由基的决定影响因素.OH.浓度和衰减速度决定了光催化反应的效率.研究表明,O-的寿命可以长达几十微秒.利用纳秒激光闪光光解的研究结果阐明了Pt4+掺杂显著提高TiO2光催化活性的机制.
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| 关 键 词： | 激光闪光光解技术 Pt4+ 掺杂 TiO2 光催化 |
| 收稿时间： | 2006-12-19 |
Study on the Influence of Pt4+ Doping on the Photocatalytic Efficiency of TiO2 by Technique of Laser Flash Photolysis |
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| LI Guang-qin,LIU Chun-yan,LIU Yun.Study on the Influence of Pt4+ Doping on the Photocatalytic Efficiency of TiO2 by Technique of Laser Flash Photolysis[J].Imaging Science and Photochemistry,2007,25(3):191-197. |
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| Authors: | LI Guang-qin LIU Chun-yan LIU Yun |
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| Institution: | 1. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080, P. R. China;2. Graduate School of the Chinese Academy of Sciences, Beijing 100039, P. R. China |
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| Abstract: | By using nanosecond laser to excite colloidal particles of pure and Pt4+ doped TiO2 in aqueous solution,we have monitored the absorption spectrum of O-at about 440 nm which is the signal of trapped holes and an active species in the photocatalytic reaction.Results showed that the absorption spectrum decayed within microseconds,the concentration and the decay rate of O-determined the photodegradation efficiency.Thus,nanosecond laser flash photolysis has been carried out to elucidate the drastic enhancement of Pt4+ doping on the photocatalytic efficiency of TiO2. |
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| Keywords: | laser flash photolysis method Pt4+ doping TiO2 photocatalysis |
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