Poly(N-vinyl imidazole)/nitrogen-doped graphene quantum dot nanocomposite hydrogel as an efficient metal ion adsorbent of aqueous systems

A highly efficient poly( N -vinyl imidazole)/nitrogen-doped graphene quantum dot nanocomposite hydrogel is designed for the adsorptive removal of cadmium, nickel, and chromium ions from aqueous solution. The nanocomposite hydrogels were synthesized through free-radical polymerization of N -vinyl imi...

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Bibliographic Details
Published in:Iranian polymer journal 2022-04, Vol.31 (4), p.533-551
Main Authors: Massoudi, Solmaz, Bagheri, Massoumeh, Hosseini, Maryam
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Adsorptivity
Aqueous solutions
Ceramics
Chemistry
Chemistry and Materials Science
Chromium
Composites
Crosslinking
Free radical polymerization
Glass
Graphene
Hydrogels
Imidazole
Ion concentration
Ionic liquids
Ions
Isotherms
Kinetics
Metal ions
Morphology
Nanocomposites
Natural Materials
Nitrogen
Original Research
Polymer Sciences
Quantum dots
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Summary:A highly efficient poly( N -vinyl imidazole)/nitrogen-doped graphene quantum dot nanocomposite hydrogel is designed for the adsorptive removal of cadmium, nickel, and chromium ions from aqueous solution. The nanocomposite hydrogels were synthesized through free-radical polymerization of N -vinyl imidazole (VI) and simultaneous cross linking by an imidazolium-based ionic liquid (DIL) with constant molar ratio of VI/DIL = 24 in the presence of nitrogen-doped graphene quantum dots (NGQD) (0.9% and 4.0% by weights) in an aqueous media. The maximum swelling degree and improved morphological features were achieved for NGQDs at its highest content, and that was used in the removal of three cations from aqueous solution. FTIR, DSC, XRD and SEM equipped with energy dispersive X-ray spectroscopy analysis were used to characterize the structure and surface morphology of the adsorbent before and after adsorption process. The effects of pH, initial concentrations of ions and contact time on the adsorption capacity of composite hydrogels were optimized. The removal efficiencies for Cd(II), Ni(II) and Cr(VI) ions were found to be 75.1%, 94.6% and 70.8% at pH 7.0, optimal ion concentration of 1000 mg/L and at contact times of 40, 45 and 180 min, respectively. The adsorption kinetics and isotherm models showed that the process was better explained by pseudo-first-order kinetics and the Langmuir isotherm model. From the model, the maximum adsorption capacities for Cd(II), Ni(II) and Cr(VI) ions were found to be 500, 555 and 357 mg/g, respectively. The results suggested that the developed nanocomposite hydrogel can effectively be used for the adsorption removal of studied metal ions. Graphical abstract
ISSN:1026-1265
1735-5265
DOI:10.1007/s13726-021-01010-y