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Title: Photolysis of ferric ions in the presence of sulfate or chloride ions: implications for the photo-Fenton process
Authors: Machulek, Amilcar
Moraes, Jose Ermirio F. [UNIFESP]
Okano, Laura T.
Silverio, Cristina A.
Quina, Frank H.
Fundacao Univ Fed Grande Dourados
Universidade Federal de São Paulo (UNIFESP)
Universidade de São Paulo (USP)
Issue Date: 1-Jan-2009
Publisher: Royal Soc Chemistry
Citation: Photochemical & Photobiological Sciences. Cambridge: Royal Soc Chemistry, v. 8, n. 7, p. 985-991, 2009.
Abstract: The photo-Fenton process (Fe(2+)/Fe(3+), H(2)O(2), 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 Fe(3+) back to Fe(2+). in this paper, the effect of sulfate or chloride ions on the net yield of Fe(2+) during the photolysis of Fe(3+) 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 Fe(2+) satisfactorily. Both experimental data and model prediction show that the availability of Fe(2+) produced by photolysis of Fe(3+) 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.
ISSN: 1474-905X
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