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ABSTRACT
In this study, we prepared glucose and glucosamine-grafted polyacrylamide (PAM)/graphite composites as adsorbents and characterized by Fourier transform infrared (FT-IR), SEM/EDAX, XRD and TGA analysis. Direct blue 2b dye removal by composites was investigated using kinetic, equilibrium and thermodynamic studies by varying adsorption parameters. The results manifest that glucosamine-grafted PAM/graphite composite was an efficient adsorbent for the expulsion of dye from aqueous medium. The Freundlich isotherm fits well with the equilibrium data. The pseudo second-order model was suitable for describing the kinetic data and equilibrium attained within 60 min. Thermodynamic analysis reveals that adsorption of dye is physical, spontaneous and endothermic in nature. The recyclability study reveals that the regeneration efficiency of GA-g-PAM/graphite was maintained 85.35% up to eight cycles.
Acknowledgments
The authors are very grateful to Indian Institute of Science Education and Research (IISER) Thiruvananthapuram, India for recording FT-IR, TGA, SEM and XRD analysis.