The roles of Li+ and F- ions in Li-F-codoped TiO2 system

被引：28

作者：

Jiang, Hongfu ^{[1
]}

Song, Haiyan ^{[1
]}

Zhou, Zuoxing ^{[1
]}

Liu, Xingqin ^{[1
]}

Meng, Guangyao ^{[1
]}

机构：

[1] Univ Sci & Technol China, Dept Mat Sci & Engn, Anhua 230026, Peoples R China

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2007年 / 68卷 / 10期

关键词：

semiconductors; oxide; luminescence; phase transitions;

D O I：

10.1016/j.jpcs.2007.01.027

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

An overall comparative study was carried out on Li-doped, F-doped, and Li-F-codoped TiO2 powders in order to elucidate the roles of Li+ and F- ions in photocatalyst. The characteristic data were based on the analysis of XRD, XPS, and PL spectra. The effects of atomic ratio of Li/Ti and F/Ti on the photocatalytic activity were also investigated. As the results, Li doping accelerated the phase formation of rutile in lower temperature while F doping prevented the phase transition from anatase to rutile. Li doping inducted a large amount Of O-OH on the surface of TiO2, while F doping consumed much of O-OH. Li+ ions acted as the roles of recombination center of electron-hole pairs while F doping could restrain the recombination of electron-hole pairs on the center of Li (+) ions. The roles of Li+ and F- ions were also confirmed in the experimental section, where the photocatalytic activity of TiO2 was improved greatly by synergistic reaction of Li+ and F- ions. (c) 2007 Published by Elsevier Ltd.

引用

页码：1830 / 1835

页数：6

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