Synthèse verte et caractérisation physico-chimique de nanomatériaux magnétiques. Applications en traitement environnemental pour l’adsorption de polluants organiques en milieu aqueux

Abstract

his study aims to analyze the removal of methylene blue via batch adsorption using magnetic bentonite-based adsorbents and their encapsulation in alginate. These materials un-derwent various characterizations,including SEM/EDS,IRTIF,XRD, and pHpzc analysis. The influence of different parameters on the adsorption process, such as pH, adsorbent dosage, and temperature, was also examined. The study includes an analysis of adsorption isotherms and kinetics , modeled using mathematical approaches . he results indicate that adsorption kinetics follow a pseudo-second-order model, while the isotherms fit well with the Langmuir model, suggesting monolayer adsorption. Additionally, the beads exhibit good durability, maintaining a removal efficiency exceeding 90 % after five regeneration cycles.In-depth theoretical inves-igations using DFT, FMO, RDG, and QTAIM analyses identified van der Waals forces and hydrogen bonding as the primary interactions governing adsorption. In conclusion, the devel-oped materials, particularly the composites, prove to be highly effective and environmentally friendly adsorbents for the removal of various pollutants.