Contribution à l’étude de l’élimination du vert brillant et le rouge de méthyle (colorants)paradsorption sur lamaghnite et la conception d’une mini station d’épuration.

Abstract

Colored industrial wastewater represents a major source of pollution. This work focused on the removal of RM andVBbyadsorption,asimple,effective,andlow-costmethod.Maghnite,anaturalclayavailableinAlgeriaand atlowcost, wasused asan adsorbent. Parameterssuch aspH,initialconcentration,contacttime,andtemperature were studied. The adsorption was rapid, with equilibrium reached in a few minutes. The maximum adsorption capacities are comparable for both dyes: approximately 12 mg/g for VB and 15 mg/g for RM, which reflects a goodadsorptioncapacityofmaghnite.Thepseudo-second-orderkineticmodelprovidedthebestfitforbothdyes. Accordingtotheisotherms,theadsorptionofVBfollowstheLangmuirmodel(monolayer,homogeneoussurface), while that of RM is better described by the Freundlich model (multilayer, heterogeneous surface). The effect of temperature was favorable for RM and negligible for VB. Finally, the infrared spectra confirmed the adsorption through theshift ofcharacteristicbands. Asimplified diagram ofa wastewater treatmentplantwasproposed asa practical application.