The removal of the anthraquinone dye Alizarin Red S (AR) has been investigated by electro-Fenton process using a commercial graphite-felt to electrogenerate in situ hydrogen peroxide and regenerate ferrous ions as catalyst. The effect of operating conditions such as applied current, catalyst concentration, and initial dye content on AR degradation has been studied. AR decay kinetic, the evolution of its oxidation intermediates and the mineralization of the aqueous solutions were monitored during the electrolysis by UV-vis analysis and TOC measurements. The experimental results showed that AR was completely removed by the reaction with •OH radicals generated from electrochemically assisted Fenton’s reaction, and the decay kinetic always follows a pseudo-first-order reaction. The optimum applied current and catalyst concentration values were determined as 300 mA and 0.2 mM Fe2+. In these conditions, after 210 min of electrolysis 95% of the initial TOC was removed, meaning the almost complete mineralization of the organic content of the treated solution.
Degradation of Alizarin Red by electro-Fenton process using a graphite-felt cathode
PANIZZA, MARCO;
2011-01-01
Abstract
The removal of the anthraquinone dye Alizarin Red S (AR) has been investigated by electro-Fenton process using a commercial graphite-felt to electrogenerate in situ hydrogen peroxide and regenerate ferrous ions as catalyst. The effect of operating conditions such as applied current, catalyst concentration, and initial dye content on AR degradation has been studied. AR decay kinetic, the evolution of its oxidation intermediates and the mineralization of the aqueous solutions were monitored during the electrolysis by UV-vis analysis and TOC measurements. The experimental results showed that AR was completely removed by the reaction with •OH radicals generated from electrochemically assisted Fenton’s reaction, and the decay kinetic always follows a pseudo-first-order reaction. The optimum applied current and catalyst concentration values were determined as 300 mA and 0.2 mM Fe2+. In these conditions, after 210 min of electrolysis 95% of the initial TOC was removed, meaning the almost complete mineralization of the organic content of the treated solution.
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