Enhanced photocatalytic activity and modulated micro-structure of TiO2 by Ta doping
FU Chengxin
ZHANG Ning
WU Yitao
LIU Jiaqi
GONG Yinyan
Abstract：The present work improved the photocatalytic activity of TiO2 nanoparticles by Ta doping,and investigated the modification of the crystal microstructure due to incorporation of Ta and the fundamental mechanism for the enhanced photodegradation performance.Ta-doped TiO2 photocatalysts with different Ta dopant concentrations were prepared by a sol-gel method.Photocatalytic activity were valued by the degradation of Rhodamine B.X-ray diffraction (XRD),Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) measurements were used to investigate the influence of Ta doping on the microstructure and electronic properties of TiO2.The results show that Ta5+ is doped in TiO2 in a substitutional mode by replacing Ti4+,and the incorporation of Ta facilitate the formation of oxygen vacancies.The presence of Ta5+ and oxygen vacancies can increase the electron density and prevent the recombination of photogenerated carriers,and thus enhance the photocatalytic activity of TiO2.It is found that the Ta-3 photocatalyst exhibits the highest degradation efficiency of Rodamine B at 83.8％ under nature light irradiation for 2h,which is more than twice that ofundoped sample.
Keywords：TiO2 nanoparticleTa dopingphotocatalysis
Publication Date：2017-01-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：5( 44-48 )