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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.
Carbohydrate Polymers
|April 15, 2019
Summary
Novel polysaccharide-based adsorbents were synthesized using [1-hydrogen-3-methylimidazolium hydrogen sulfate ionic liquid ([Hmim][HSO4])]. These eco-friendly materials demonstrate high capacity for removing lead (Pb(II)) from aqueous systems via chemisorption.
Area of Science:
- Materials Science
- Environmental Chemistry
- Green Chemistry
Background:
- Developing efficient adsorbents for heavy metal removal is crucial for environmental remediation.
- Polyelectrolyte complexes (PECs) offer promising properties for adsorption applications.
- Ionic liquids are explored as sustainable reaction media for material synthesis.
Purpose of the Study:
- To synthesize alginate/chitosan (ALG/CHT) and alginate/N,N-dimethyl chitosan (ALG/DMC) polyelectrolyte complex (PEC)-based adsorbents.
- To utilize [1-hydrogen-3-methylimidazolium hydrogen sulfate ionic liquid ([Hmim][HSO4])] as a reaction medium and investigate its recyclability.
- To evaluate the adsorption performance of the synthesized PECs for Pb(II) removal from aqueous solutions.
Main Methods:
- Synthesis of ALG/CHT and ALG/DMC PECs using [Hmim][HSO4].
- Characterization of ionic liquid and PECs using 1H NMR, FTIR, SEM, XPS, and Zeta potential.
- Adsorption studies including kinetic (pseudo-second-order) and equilibrium (Redlich-Peterson isotherm) analyses.
Main Results:
- Maximum adsorption capacities (q_m) of 529.4 mg/g for CHT/ALG and 560.2 mg/g for DMC/ALG were achieved.
- The pseudo-second-order kinetic model and Redlich-Peterson isotherm best described the adsorption process.
- Chemisorption was confirmed as the primary mechanism for Pb(II) removal.
- The ionic liquid was successfully recovered and reused, yielding adsorbents with comparable performance.
Conclusions:
- The synthesized PEC-based adsorbents exhibit high efficiency for Pb(II) removal.
- [Hmim][HSO4] serves as an effective and recyclable medium for preparing novel, eco-friendly adsorbents.
- This approach offers a sustainable alternative for heavy metal remediation in aqueous systems.
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