Application of pyridine-modified chitosan derivative for simultaneous adsorption of Cu(II) and oxyanions of Cr(VI) from aqueous solution.
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Date
2021
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Abstract
The bioadsorbent C1, which is a chitosan derivative prepared in a one-step synthesis, was successfully used to
adsorb Cr(VI) and Cu(II) simultaneously. Here, for the first time the simultaneous adsorption of a cation and an
anion was modeled using the Corsel model for kinetics and the Real Adsorbed Solution Theory model for
equilibrium data. Batch studies of the adsorption of Cu(II) and Cr(VI) in single and binary aqueous solutions were
performed as a function of initial solute concentration, contact time, and solution pH. The maximum adsorption
capacities of C1 in single and binary aqueous solutions were 1.84 and 1.13 mmol g− 1 for Cu(II) and 3.86 and
0.98 mmol g− 1 for Cr(VI), respectively. The reuse of C1 was investigated, with Cu(II) ions being almost
completely desorbed and fully re-adsorbed. For Cr(VI), the desorption was incomplete resulting in a lower re-
adsorption. Energy-dispersive X-ray spectroscopy was used for mapping the distributions of Cr(VI) and Cu(II)
adsorbed on the C1 surface in single and binary adsorption systems. Isothermal titration calorimetry experiments
were performed for Cr(VI) and Cu(II) adsorption in single solutions. The thermodynamic parameters of
adsorption showed that the adsorption of both metal ions was enthalpically driven, but entropically unfavorable.
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Keywords
One-step synthesis, Copper, Chromium, Real adsorbed solution theory, Corsel model
Citation
GONÇALVES, F. J. et al. Application of pyridine-modified chitosan derivative for simultaneous adsorption of Cu(II) and oxyanions of Cr(VI) from aqueous solution. Journal of Environmental Management, v. 282, artigo 111939, 2021. Disponível em: <https://www.sciencedirect.com/science/article/pii/S0301479721000013>. Acesso em: 11 out. 2022.