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Evaluation of Batch and Equilibrium Cr6+ adsorption on Fe3O4 nanoparticles via isothermal and kinetic studies


 Since many centuries, we have progressively tracked our capacities in the field of water contamination. An intense increase in heavy metals have led to the problems needing priority concerns. In this study, we have fabricated nanoparticles as an alternative source to decontaminate heavy metals from water. Hence, the efficacy of Fe3O4 nanoparticles was observed by adsorbing Cr6+ ions from aqueous systems. HRTEM analysis determined the average size of 42.90 nm and spherical morphology of the nanoparticles. Various parameters at their optimum conditions such as pH 2, contact time 50 minutes, temperature 20°C, initial metal concentration of 10 mgL-1 and nanoparticle dose of 60 mg were found to achieve maximum adsorption. Isotherms like Langmuir, Freundlich, Temkin and D-R were applied to the experimental equilibrium data, and it corresponds to the Temkin model with a correlation coefficient (R2) of 0.99. Moreover, pseudo second order reaction describes the adsorption which was a three-step process. The negative value of ΔG well describes the physisorption nature, feasibility, and spontaneity of the adsorption process.