GRAPHENE CALCIUM FERRITE NANOCOMPOSITE EFFECTIVELY ADSORBS AND REMOVES THE TOXIC ACID BLUE 25 DYE FROM AQUEOUS MEDIUM

Abstract

The modified Hummers technique was employed in this study to make a graphene CaFe₂O₄ composite that was used as an adsorbent to remove acid blue 25 dye from aqueous solution. XRD, SEM and TEM were employed to characterize the adsorbent. Acid Blue 25 was adsorbed using the resulting adsorbent under a variety of experimental settings. Within 240 minutes, the initial fast adsorption of dye species achieved equilibrium. With a rate constant of 8.49 × 10–4 g mg–1 min–1 at 303 K, the interactions were much closer to second-order kinetics. 100.0 mg g^–1 was the Langmuir monolayer capacity at 303 K. The interaction was endothermic with ∆H 60.7 KJ mol^–1 accompanied by a rise in entropy and a decrease in Gibb’s free energy