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1 January 2006 Laser Flash Photolysis Study of the Photocatalytic Step of the Photo-Fenton Reaction in Saline Solution
Amilcar Machulek, Carolina Vautier-Giongo, José E. F. Moraes, Claudio A. O. Nascimento, Frank H. Quina
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Abstract

The photo-Fenton reaction (Fe2 /Fe3 , H2O2, UV light) is strongly inhibited by high concentrations of added chloride ion. In this work, the effect of added chloride ion on the photocatalytic step that converts Fe(III) back to Fe(II) is studied by nanosecond laser flash photolysis over a wide range of pH (1.0–3.3) and concentrations of Fe(III) (0.1–1.0 mM) and chloride ion (0.05–0.75 M). An explicit mechanistic model based on the preferential formation of the less-reactive Cl2·− radical anion via two routes (competitive photolysis of the iron(III)-chloride complex to chlorine atoms instead of the desired hydroxyl radical and pH-dependent scavenging of the hydroxyl radical by chloride ion) is proposed. This model, which fits the laser flash photolysis data for the production and decay of Cl2·− over the entire range of conditions investigated, suggests that inhibition of the photocatalytic step of the photo-Fenton process in the presence of chloride ion can be circumvented by maintaining the pH of the medium at or slightly above 3.0 throughout the reaction.

Amilcar Machulek, Carolina Vautier-Giongo, José E. F. Moraes, Claudio A. O. Nascimento, and Frank H. Quina "Laser Flash Photolysis Study of the Photocatalytic Step of the Photo-Fenton Reaction in Saline Solution," Photochemistry and Photobiology 82(1), 208-212, (1 January 2006). https://doi.org/10.1562/2005-05-28-RA-548
Received: 28 May 2005; Accepted: 21 August 2005; Published: 1 January 2006
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