Application of pyridine-modified chitosan derivative for simultaneous adsorption of Cu(II) and oxyanions of Cr(VI) from aqueous solution.

Autor: Jorge Gonçalves F; Environmental Organic Chemistry Group, Department of Chemistry, Institute of Biological and Exact Sciences, Federal University of Ouro Preto, Campus Universitário Morro do Cruzeiro, Bauxita, Ouro Preto, 35400-000, Minas Gerais, Brazil., Alves Gurgel LV; Environmental Organic Chemistry Group, Department of Chemistry, Institute of Biological and Exact Sciences, Federal University of Ouro Preto, Campus Universitário Morro do Cruzeiro, Bauxita, Ouro Preto, 35400-000, Minas Gerais, Brazil., Catone Soares L; Environmental Organic Chemistry Group, Department of Chemistry, Institute of Biological and Exact Sciences, Federal University of Ouro Preto, Campus Universitário Morro do Cruzeiro, Bauxita, Ouro Preto, 35400-000, Minas Gerais, Brazil., Simões Teodoro F; Environmental Organic Chemistry Group, Department of Chemistry, Institute of Biological and Exact Sciences, Federal University of Ouro Preto, Campus Universitário Morro do Cruzeiro, Bauxita, Ouro Preto, 35400-000, Minas Gerais, Brazil., Dias Ferreira GM; Department of Chemistry, Federal University of Lavras, Campus Universitário, Lavras, 37200-000, Minas Gerais, Brazil., Coelho YL; Colloidal and Macromolecular Green Chemistry Group, Department of Chemistry, Federal University of Viçosa, Av. P.H. Rolfs, s/n°, Viçosa, 36570-000, Minas Gerais, Brazil., Mendes da Silva LH; Colloidal and Macromolecular Green Chemistry Group, Department of Chemistry, Federal University of Viçosa, Av. P.H. Rolfs, s/n°, Viçosa, 36570-000, Minas Gerais, Brazil., Prim D; University of Versailles St-Quentin-en-Yvelines, Institut Lavoisier de Versailles UMR CNRS 8180, 45, avenue des Etats-Unis, 78035, Versailles, France., Gil LF; Environmental Organic Chemistry Group, Department of Chemistry, Institute of Biological and Exact Sciences, Federal University of Ouro Preto, Campus Universitário Morro do Cruzeiro, Bauxita, Ouro Preto, 35400-000, Minas Gerais, Brazil. Electronic address: laurent@ufop.edu.br.
Jazyk: angličtina
Zdroj: Journal of environmental management [J Environ Manage] 2021 Mar 15; Vol. 282, pp. 111939. Date of Electronic Publication: 2021 Jan 21.
DOI: 10.1016/j.jenvman.2021.111939
Abstrakt: 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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Databáze: MEDLINE
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