Studies of Nanosized Iron-Doped TiO2 Photocatalysts by Spectroscopic Methods

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

14 Scopus Citations
View graph of relations

Author(s)

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)447-459
Journal / PublicationApplied Magnetic Resonance
Volume48
Issue number5
Publication statusPublished - 1 May 2017

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.

Citation Format(s)

Studies of Nanosized Iron-Doped TiO2 Photocatalysts by Spectroscopic Methods. / Kokorin, A. I.; Amal, R.; Teoh, W. Y. et al.
In: Applied Magnetic Resonance, Vol. 48, No. 5, 01.05.2017, p. 447-459.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review