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Incorporation of dithiooxamide as a complexing agent into cellulose for the removal and pre-concentration of Cu(II) and Cd(II) ions from natural water samples

Jorgetto, A.O. ; Silva, R.I.V. ; Longo, M.M. ; Saeki, M.J. ; Padilha, P.M. ; Martines, M.A.U. ; Rocha, B.P. ; Castro, G.R.

Applied surface science, 2013-01, Vol.264, p.368-374 [Periódico revisado por pares]

Amsterdam: Elsevier B.V

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  • Título:
    Incorporation of dithiooxamide as a complexing agent into cellulose for the removal and pre-concentration of Cu(II) and Cd(II) ions from natural water samples
  • Autor: Jorgetto, A.O. ; Silva, R.I.V. ; Longo, M.M. ; Saeki, M.J. ; Padilha, P.M. ; Martines, M.A.U. ; Rocha, B.P. ; Castro, G.R.
  • Assuntos: Condensed matter: electronic structure, electrical, magnetic, and optical properties ; Condensed matter: structure, mechanical and thermal properties ; Cross-disciplinary physics: materials science; rheology ; Exact sciences and technology ; Metal ions ; Modified cellulose ; Natural water ; Physics ; Pre-concentration ; Purification
  • É parte de: Applied surface science, 2013-01, Vol.264, p.368-374
  • Descrição: [Display omitted] ► A complexing agent was incorporated into the structure of commercial cellulose. ► The modified cellulose was used in the removal of metal species from river water. ► An enrichment factor of 50 enable the determination of Cu(II) and Cd(II) ions. ► A metal:ligand complex with a ratio of 1:2 allowed for the development of a possible binding structure. ► Method validation was performed through an analysis of certified water standards. The present study describes the incorporation of a complexing agent, dithiooxamide, into microcrystalline cellulose for use in the pre-concentration of Cu(II) and Cd(II) ions from aqueous samples. The FTIR spectrum of the adsorbent exhibited an absorption band in the region of 800cm−1, which confirmed the binding of the silylating agent to the matrix. Elemental analysis indicated the amount of 0.150mmolg−1 of the complexing agent. The adsorption data were fit to the modified Langmuir equation, and the maximum amount of metal species extracted from the solution, Ns, was determined to be 0.058 and 0.072mmolg−1 for Cu(II) and Cd(II), respectively. The covering fraction ϕ, which was 0.39 and 0.48 for Cu(II) and Cd(II), respectively, was used to estimate a 1:2 (metal:ligand) ratio in the formed complex, and a binding model was proposed based on this information. The adsorbent was applied in the pre-concentration of natural water samples and exhibited an enrichment factor of approximately 50-fold for the species studied, which enabled its use in the analysis of trace metals in aqueous samples. The system was validated by the analysis of certified standard (1643e), and the adsorbent was stable for more than 20 cycles, thus enabling its safe reutilization.
  • Editor: Amsterdam: Elsevier B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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