Fenton-like oxidation of an azo dye using mesoporous Fe/TiO2 catalysts prepared by a microwave-assisted hydrothermal process

Fe-doped TiO2 photocatalysts with different contents of Fe (0.5, 1.6, 3.4 and 6.4 %) were synthesized by a microwave-hydrothermal method and characterized by X-ray diffraction analysis, N2 physisorption at 77 K and UV–Vis spectrometry. The characterization showed that the Fe ions were highly dispers...

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Bibliographic Details
Published in:Journal of the Serbian Chemical Society 2014-01, Vol.79 (8), p.977
Main Authors: Nešić, Jelena, Manojlović, Dragan D, Jović, Milica, Dojčinović, Biljana P, Vulić, Predrag J, Krstić, Jugoslav, Roglić, Goran M
Format: Article
Language:English
Subjects:
Absorption spectra
Catalysis
Catalysts
Catalytic activity
Chemical synthesis
Chlorophenol
Decoloring
Doppler effect
Dyes
Hydrogen peroxide
Iron
Oxidation
Photocatalysis
Photocatalysts
Pollutants
Red shift
Titanium dioxide
Titanium oxides
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Summary:Fe-doped TiO2 photocatalysts with different contents of Fe (0.5, 1.6, 3.4 and 6.4 %) were synthesized by a microwave-hydrothermal method and characterized by X-ray diffraction analysis, N2 physisorption at 77 K and UV–Vis spectrometry. The characterization showed that the Fe ions were highly dispersed in the TiO2 lattice. It was found that all the synthesized catalysts had a mesoporous structure and that Fe-doping increased the BET surface area. The UV–Vis study showed that the absorption spectra were shifted to longer wavelengths (red shift) with increasing dopant concentration. The photocatalytic activity of the sAMples was evaluated by the decolorization of the textile dye Reactive Blue 52 (RB) in aqueous solutions under sun-like radiation in the presence of H2O2 (a heterogeneous photo-Fenton process). The photocatalyst with 3.4 % Fe was found to be the most efficient in the presence of H2O2. The effect of the initial pH of the dye solution was assessed and dissolution of iron ions was studied as a function of pH value. It was concluded that decolorizationwas more favorable in acidic pH, and that at pH values >4, the release of Fe ions into the solution was negligible. Photocatalytic degradation of 4-chlorophenol (4-CP) was investigated under the optimal conditions and it was shown that the catalyst was capable of degrading colorless pollutants.
ISSN:0352-5139
1820-7421
DOI:10.2298/JSC131001143N