Abstract
Iron-doped TiO2 nanoparticles with iron content in the range of 0.005 < Fe/Ti < 0.3 were prepared using the flame spray pyrolysis method and investigated with CW X-band electron paramagnetic resonance (EPR), X-ray diffraction, and Fourier transform infrared spectroscopy. This allowed for the clarification of the internal organization of Fe–TiO2 nanoparticles. Different types of Fe(III) centers were distinguished in the samples: isolated high-spin paramagnetic Fe(III) ions (S = 5/2) in rhombic ligand fields state at 0.005 < Fe/Ti < 0.05, and Fe(III) ferromagnetic clusters at Fe/Ti < 0.1. All Fe-doped samples had rather high activity for the photocatalytic mineralization of oxalic acid under visible light illumination (λ > 400 nm) at 25 °C. Correlations were made between EPR and photocatalytic activity results. The specific surface area [S] data allowed us to deduce that the isolated Fe(III) centers were responsible for the photomineralisation of oxalic acid, while the Fe(III) ferromagnetic aggregates decreased the total efficiency of the system.
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Acknowledgements
A.I.K. thanks Russian Foundation for Basic Research (Grant No. 16-53-00136-Bel-a) for financial support. EPR measurements were partially done at the equipment of the User Facilities Center of M.V. Lomonosov Moscow State University. We thank Prof. E.A. Konstantinova and A.A. Minnekhanov from the same Center for their help in EPR spectra calculations.
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Kokorin, A.I., Amal, R., Teoh, W.Y. et al. Studies of Nanosized Iron-Doped TiO2 Photocatalysts by Spectroscopic Methods. Appl Magn Reson 48, 447–459 (2017). https://doi.org/10.1007/s00723-017-0873-1
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DOI: https://doi.org/10.1007/s00723-017-0873-1