Research on the positron annihilation of nanometer TiO2 photocatalytic material doped metal ions
(0) The defects of nanometer TiO2 photocatalytic material doped 13 metal ions have been examined in this paper, and the effects of dopants on the mean electron density and photoreactivity of nanometer TiO2 are discussed by means of positron annihilation technology. Results show that oxygen vacancy, twin crystal boundary, dislocation and metal vacancy. The analysis of Doppler energy spectra of TiO2 positron annihilation indicates that the doping of high valence ion of Fe3+,W6+ and La3+ decrease the mean electron density of nanometer TiO2, and the low valence ion of Zn2+、Cu2+、Pb2+、Mn2+、Co2+、Ag+ increase the mean electron density of nanometer TiO2. However the doping of Al3+、V5+、Ni2+、Cr3+ can not influence the mean electron density of nanometer TiO2.The analysis of the correlation between Doppler energy spectra of TiO2 positron annihilation and the photocatalytic activity indicate that the formation of free volume defects is disadvantageous for the improvement of TiO2 photocatalytic activity when doping Pb2+, La3+, Cr3+, Co2+ ions; while the formation of free volume defects is advantageous for the improvement of TiO2 photocatalytic activity when doping Fe3+, W6+, La3+, Cu2+, Mn2+, Ag+, Al3+, V5+, Ni2+ ions.
ion doping nanometer TiO2 PAT photocatalysis
陈建华 陈晔 邓文
广西大学资源与环境学院,广西南宁,530004 物理科学与工程技术学院,广西南宁,530004
国际会议
成都
英文
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）