Removal of acid red 18 dye in aqueous solution by the Fenton process
Abstract
Dyes are potential sources of contamination of surface and groundwater. Coloring molecules are in general very recalcitrant and produce strong environmental and human health impacts. Among the different methodologies used in the treatment of colored effluents, there are the Advanced Oxidative Processes (AOP) with emphasis in photolytic systems with UV radiation, chemical systems with H2O2 and O3 and catalytic processes (Fenton treatments). In the present work, the degradation capacity of the azo dye Acid Red 18 was evaluated using the Fenton system with FeSO4.7H2O and H2O2. The degradation tests were carried out at room temperature (25 oC), pH = 3.0 and agitation at 150 rpm according to a factorial design to evaluate the effect of the initial dye concentration variables (50 mg.L-1 to 150 mg.L-1), FeSO4.7H2O concentration and H2O2 concentration (both between 33 mg.L-1 and 67 mg.L-1) in the dye removal. Experimentally, dye degradation greater than 93% was found for any level of H2O2 used under a concentration of FeSO4.7H2O of 40 mg.L-1 after 60 minutes of treatment. The optimal operating conditions estimated from the regression of the degradation efficiency values were 109.7 mg.L-1 of dye; 41.6 mg.L-1 of FeSO4.7H2O and 37.2 mg.L-1 of H2O2. In general, the results found show the promising character of the Fenton process in the decolorization of azo dyes in aqueous media.
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