Journal Title
Title of Journal: Res Chem Intermed
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Abbravation: Research on Chemical Intermediates
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Publisher
Springer Netherlands
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Authors: Yufei Zhang Huiyuan Shen Yanhua Liu
Publish Date: 2015/04/25
Volume: 42, Issue: 2, Pages: 687-711
Abstract
TiO2 photocatalysts codoped with N and Fe were synthesized by the sol–gel method Cooperation of N and Fe in the codoped TiO2 was studied by monitoring NH3 decomposition Xray diffraction XRD scanning electron microscopy SEM highresolution transmission electron microscopy HRTEM Xray photoelectron spectroscopy XPS ultraviolet–visible UV–Vis absorption spectroscopy and simulation based on density functional theory DFT The results from NH3 decomposition revealed that cooperation of N and Fe broadened the range of response of TiO2 to visible light and also enhanced the photocatalytic activity of TiO2 under ultraviolet light The XRD patterns and SEM and HRTEM images indicated that the codoped samples prepared were nanometric anatase with an average particle size of 20 nm Codoping with N and Fe inhibited grain growth of TiO2 and resulted in larger lattice distortion XPS analysis showed that the doped N and Fe atoms were replacing lattice oxygen and Ti atoms respectively UV–Vis absorption spectra of the codoped sample showed that the optical absorption edge had been shifted to approximately 675 nm The DFT results confirmed that cooperation of the Fe3d and N2p orbits reduced the energy gap of TiO2 and thus broadened its range of response to visible light The synergistic action of the electron density around N and Fe in the codoped TiO2 enhanced its photochemical stability In addition a photocatalytic reaction mechanism for TiO2 codoped with N and Fe revealed the presence of N2p Fe3d and Ti3d orbits as photogenerated hole–electron traps which enhanced the photocatalytic quantum efficiency
Keywords:
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