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Issue 7, 2009
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Photolysis of ferric ions in the presence of sulfate or chloride ions: implications for the photo-Fenton process

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Abstract

The photo-Fenton process (Fe2+/Fe3+, H2O2, UV light) is one of the most efficient and advanced oxidation processes for the mineralization of the organic pollutants of industrial effluents and wastewater. The overall rate of the photo-Fenton process is controlled by the rate of the photolytic step that converts Fe3+ back to Fe2+. In this paper, the effect of sulfate or chloride ions on the net yield of Fe2+ during the photolysis of Fe3+ has been investigated in aqueous solution at pH 3.0 and 1.0 in the absence of hydrogen peroxide. A kinetic model based on the principal reactions that occur in the system fits the data for formation of Fe2+ satisfactorily. Both experimental data and model prediction show that the availability of Fe2+ produced by photolysis of Fe3+ is inhibited much more in the presence of sulfate ion than in the presence of chloride ion as a function of the irradiation time at pH 3.0.

Graphical abstract: Photolysis of ferric ions in the presence of sulfate or chloride ions: implications for the photo-Fenton process

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Article information


Submitted
12 Jan 2009
Accepted
11 May 2009
First published
26 May 2009

Photochem. Photobiol. Sci., 2009,8, 985-991
Article type
Paper

Photolysis of ferric ions in the presence of sulfate or chloride ions: implications for the photo-Fenton process

A. Machulek Jr., J. E. F. Moraes, L. T. Okano, C. A. Silvério and F. H. Quina, Photochem. Photobiol. Sci., 2009, 8, 985
DOI: 10.1039/B900553F

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