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• A low cost bio-based sorbent media was synthesized using chitosan.
• The media was used for the removal of nickel ions from aqueous solutions.
• Adsorption kinetics follow a pseudo-second order model.
• Langmuir isotherm best fitted adsorption data.
• Adsorption of nickel on nanofibers is spontaneous with an endothermic nature.
The objective of this study is to develop a low cost bio-based sorbent for the removal of nickel ions from aqueous solutions. Chitosan/Polyethylene oxide (Cs/PEO) nanofibers were prepared by electrospinning technique and characterized. Batch adsorption experiments were then carried out to investigate the effect of contact time and Cs/PEO mass ratio on adsorption efficiency of nickel ions. Results indicate that a maximum nickel adsorption (qm) of 227.27 mg/g was achieved at 75 °C. Pseudo-first order, pseudo-second order, and intraparticle diffusion kinetic models were used to fit kinetic adsorption data. Batch adsorption equilibrium tests were also carried out at different temperatures. Langmuir, Freundlich, Redlich-Peterson and Dubinin-Radushkevich models were fitted to experimental data. It was found that the pseudo-second order and the Langmuir models provided a high degree of correlation (R2 > 0.99) with experimental data. Adsorption was then assumed to be a spontaneous endothermic chemical process.
Journal: Journal of Environmental Chemical Engineering - Volume 4, Issue 3, September 2016, Pages 3159–3169