Abstract
Effluents from textile industries are difficult to treat because they are loaded with non-biodegradable dyes. In this context, the Advanced Oxidation Processes (AOPs) are presented as alternatives to be studied for the treatment of these effluents. The objective of this work was to evaluate the efficiency of the removal of red 4B and 5G blue dyes in synthetic solution by means of the advanced oxidation Photo-Fenton. The best pH for removal of Red 4B was pH 3 and for Blue 5G dye was pH 1.6. The obtained results report a good removal when using H2O2 and Fe2+. With a H2O2 concentration of 66.80 mg L-1, Fe2+ of 9.66 mg.L-1 and pH 5.81 with a predicted percentage removal of 100.01% for Red 4B dye. And for Blue Reactive 5G dye a concentration of H2O2 of 55,04 mg L-1, Fe2+ of 10.34 mg L-1 and pH 2.59 with an expected percentage removal of 100,56%. The kinetics was that pseudo-first order with k1 of 0,597 min-1 and t1/2 of 1,16 min for red 4B and k1 of 0,150 min-1 and t1/2 of 4,60 for blue 5G. The results indicate the application of photo-fenton as promising for the dyes removal in aqueous solutions.
Highlights
The environmental contamination has global proportions due, especially the continuous emission of large volume of domestic and industrial wastewater, with high polluting potential when not treated in a proper way
The Advanced Oxidation Processes (AOPs) are presented as alternatives to be studied for the treatment of these effluents
In order to determine the amount of dye removed, the optimum wavelength definition for the red 4B and blue 5G dyes reagent was first determined
Summary
The environmental contamination has global proportions due, especially the continuous emission of large volume of domestic and industrial wastewater, with high polluting potential when not treated in a proper way. The interest of environmental research related to the treatment of effluents from the textile industry is increasing, since these are highly complex, because they have different physical and chemical compositions, great diversity of synthetic dyes and different toxicity potentialities, making them difficult treatment and high pollution capacity[2] In this sense, the advanced oxidation processes (AOPs) have been gaining visibility as a consequence of the great contribution potential with the conventional processes of effluent treatment, since the hydroxyl radicals generated have high reactivity and low selectivity, being able to act in the chemical oxidation of a large number of substances[3]. The objective of this work was to evaluate the efficiency of the discoloration of red 4B and blue 5G in synthetic solution by means of the photo-Fenton reaction (UV/H2O2/Fe+2), by optimizing a discoloration condition for the variables pH, Fe2+ ions concentration and H2O2 concentration and kinetic study of the process
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