title: Photolysis of ferric ions in the presence of sulfate or chloride ions: implications for the photo-Fenton process.
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.
authors: Faculdade de Ciências Exatas e Tecnologia, Universidade Federal da Grande Dourados, Mato Grosso do Sul, 79804-970 MS, Brazil. machulekjr@gmail.com
authors: Amilcar
authors: A
authors: Machulek
authors: José Ermírio F
authors: JE
authors: Moraes
authors: Laura T
authors: LT
authors: Okano
authors: Cristina A
authors: CA
authors: Silvério
authors: Frank H
authors: FH
authors: Quina