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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
Polysaccharide-based adsorbents prepared in ionic liquid with high performance for removing Pb(II) from aqueous
Késsily B Rufato1, Vitor C Almeida2, Matt J Kipper3
1Department of Chemical, State University of Maringá (UEM), 5790 Colombo Av., 87020-900 Maringá, PR, Brazil; Laboratory of Materials, Macromolecules and Composites, Federal University of Technology (UTFPR), 86812-460 Apucarana, PR, Brazil.
Abstract:
Alginate/chitosan (ALG/CHT) and alginate/N,N-dimethyl chitosan (ALG/DMC) polyelectrolyte complex (PEC)-based adsorbents with high capacities for removing Pb(II) from aqueous systems are produced in [1-hydrogen-3-methylimidazolium hydrogen sulfate ionic liquid ([Hmim][HSO4-]). The [Hmim][HSO4-] is recovered, characterized by 1H NMR and reused to yield novel polysaccharide-based adsorbents. As-obtained PEC materials are characterized through infrared spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy and Zeta potential measurements. Kinetic and equilibrium adsorption studies reveal that the pseudo-second-order Kinetic, as well as the Redlich-Peterson isotherm, provide the best fits for the experimental data, respectively. CHT/ALG and DMC/ALG adsorbents promoted maximum adsorption capacities (qm) of 529.4 mg g-1 and 560.2 mg g-1, respectively. After adsorption, the materials are characterized by infrared spectroscopy and X-ray photoelectron spectroscopy, confirming that the chemisorption prevails upon Pb(II) removal. Also, PECs produced in the recovered [Hmim][HSO4-] have good capacities for removing Pb(II) ions from aqueous systems as well. This study showed that the [Hmim][HSO4-] is an alternative solvent to prepare novel and eco-friendly PEC-based adsorbents.
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