激光闪光光解技术研究Pt4+掺杂提高TiO2光催化活性机制

doi:10.7517/j.issn.1674-0475.2007.03.191

影像科学与光化学 ›› 2007, Vol. 25 ›› Issue (3): 191-197.DOI: 10.7517/j.issn.1674-0475.2007.03.191

激光闪光光解技术研究Pt⁴⁺掺杂提高TiO₂光催化活性机制

李广勤^1,2, 刘春艳¹, 刘云¹

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

收稿日期:2006-12-19 修回日期:2007-02-08 出版日期:2007-05-23 发布日期:2007-05-23
通讯作者: 刘春艳,E-mail:cyliu@mail.ipc.ac.cn.
基金资助:
国家自然科学基金(20573126,90406024)

Study on the Influence of Pt⁴⁺ Doping on the Photocatalytic Efficiency of TiO₂ by Technique of Laser Flash Photolysis

LI Guang-qin^1,2, LIU Chun-yan¹, LIU Yun¹

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

Received:2006-12-19 Revised:2007-02-08 Online:2007-05-23 Published:2007-05-23

摘要/Abstract

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.

关键词: 激光闪光光解技术, Pt⁴⁺, 掺杂, TiO₂, 光催化

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.

Key words: laser flash photolysis method, Pt⁴⁺ doping, TiO₂, photocatalysis

中图分类号:

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.

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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激光闪光光解技术研究Pt⁴⁺掺杂提高TiO₂光催化活性机制

Study on the Influence of Pt⁴⁺ Doping on the Photocatalytic Efficiency of TiO₂ by Technique of Laser Flash Photolysis

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