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- Title
Cooperation between N and Fe in co-doped TiO photocatalyst.
- Authors
Zhang, Yufei; Shen, Huiyuan; Liu, Yanhua
- Abstract
TiO photocatalysts co-doped with N and Fe were synthesized by the sol-gel method. Cooperation of N and Fe in the co-doped TiO was studied by monitoring NH decomposition, X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible (UV-Vis) absorption spectroscopy, and simulation based on density functional theory (DFT). The results from NH decomposition revealed that cooperation of N and Fe broadened the range of response of TiO to visible light and also enhanced the photocatalytic activity of TiO under ultraviolet light. The XRD patterns and SEM and HRTEM images indicated that the co-doped samples prepared were nanometric anatase with an average particle size of 20 nm. Co-doping with N and Fe inhibited grain growth of TiO 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 co-doped 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 TiO and thus broadened its range of response to visible light. The synergistic action of the electron density around N and Fe in the co-doped TiO enhanced its photochemical stability. In addition, a photocatalytic reaction mechanism for TiO co-doped with N and Fe revealed the presence of N2p, Fe3d, and Ti3d orbits as photogenerated hole-electron traps, which enhanced the photocatalytic quantum efficiency.
- Subjects
IRON compound synthesis; NITROGEN compound synthesis; TITANIUM oxides; PHOTOCATALYSTS; SOL-gel processes; DOPING agents (Chemistry)
- Publication
Research on Chemical Intermediates, 2016, Vol 42, Issue 2, p687
- ISSN
0922-6168
- Publication type
Article
- DOI
10.1007/s11164-015-2050-1