Application de l’adsorption et la photocatalyse pour la dégradation du Rouge de Congo

Abstract

The purification of aqueous effluents from the textile industry to eliminate dyes constitutes a major challenge in the treatment of wastewater. To achieve this goal, photocatalysis and adsorption are often used. In this experimental study, we examined the elimination of a specific dye, Congo red, using heterogeneous photocatalysis. We combined a biomass called Saccharothrix algeriensis (SA) with FeCl3, 6H2O, to form Fe-SA. The objective was to study the influence of various parameters such as the contact time, the pH of the solution and the initial concentration of the dye on the adsorption capacity of Congo red by Fe-SA. The results obtained revealed a maximum discoloration rate of 43% for Congo red thanks to the photocatalytic process. The analysis of the data using kinetic models has shown that the pseudo-second-order model offers a better representation of the evolution of the adsorbed amount of the Congo red pollutant over time. In addition, the Langmuir model proved to be the most suitable for reproducing the experimental adsorption isotherms. The experiments also demonstrated that the maximum adsorption capacity was reached at a pH of 2 and that equilibrium was reached after one hour of contact. In conclusion, the results of this experimental study clearly indicated that the photocatalysis process obtained a decolorization yield higher than that of adsorption.