Studies of Nanosized Iron-Doped TiO2 Photocatalysts by Spectroscopic Methods

被引：0

作者：

A. I. Kokorin

R. Amal

W. Y. Teoh

A. I. Kulak

机构：

[1] N. N. Semenov International Center of Chemical Physics (ICCP),School of Chemical Sciences and Engineering

[2] UNSW,School of Energy and Environment

[3] City University of Hong,Institute of General and Inorganic Chemistry

[4] National Academy of Sciences of Belarus,undefined

来源：

Applied Magnetic Resonance | 2017年 / 48卷

关键词：

TiO2; Electron Paramagnetic Resonance; Rutile; Electron Paramagnetic Resonance Spectrum; Electron Paramagnetic Resonance Signal;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

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.

引用

页码：447 / 459

页数：12

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