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This study aims to demonstrate the effects of pH and of inorganic anions on the photoreduction of Fe(III). Effective quantum yields for the production of  • OH radicals from iron(III) hydroxo species in pechlorate medium and in the present of chloride and sulfate anions were determined in the pH range 1-3. Experiments were carried out in batch at 25°C with a low-pressure mercury vapor lamp emitted at 253.7 nm. The method was based on measuring the pseudo-first-order rate constant of the photoreduction of Fe(III)-complexes in which tert-butanol scavenged the  • OH at an identical rate. The results showed that the apparent quantum yield of photoreduction of Fe(III) increased when the pH increases, the values passed from 0.063 at pH 1 to 0.1 at pH 3 ([Fe(III)] 0  = 1 mM and 3 mM). The effects of Cl- or SO 4  2-  on the photoreduction of Fe(III) depended on pH and on ion concentrations. The apparent quantum yield values increased in the present of anion Cl - , whereas those values decreased in the present of anion SO 4  2- . For the Photo Fenton system, the effects of Cl- or SO 4  2-  were found to depend on pH, on the concentrations of the inorganic anions and to decrease the rate of decomposition of H 2 O 2 .

Effect of Chloride and Sulfate Ions on the Photoreduction Rate of Ferric Ion in UV Reactor Equipped with a Low Pressure Mercury Lamp