The reactive surface of Castor leaf [Ricinus communis L.] powder as a green adsorbent for the removal of heavy metals from natural river water
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Data
2013-07-01
Autores
Martins, Amanda E. [UNESP]
Pereira, Milene S. [UNESP]
Jorgetto, Alexandre O. [UNESP]
Martines, Marco A.U.
Silva, Rafael I.V. [UNESP]
Saeki, Margarida J. [UNESP]
Castro, Gustavo R. [UNESP]
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Resumo
In this study, a green adsorbent was successfully applied to remove toxic metals from aqueous solutions. Dried minced castor leaves were fractionated into 63-μm particles to perform characterization and extraction experiments. Absorption bands in FTIR (Fourier Transform Infrared Spectroscopy) spectra at 1544, 1232 and 1350 cm-1 were assigned to nitrogen-containing groups. Elemental analysis showed high nitrogen and sulfur content: 5.76 and 1.93%, respectively. The adsorption kinetics for Cd(II) and Pb(II) followed a pseudo-second-order model, and no difference between the experimental and calculated Nf values (0.094 and 0.05 mmol g-1 for Cd(II) and Pb(II), respectively) was observed. The Ns values calculated using the modified Langmuir equation, 0.340 and 0.327 mmol g-1 for Cd(II) and Pb(II), respectively, were superior to the results obtained for several materials in the literature. The method proposed in this study was applied to pre-concentrate (45-fold enrichment factor) and used to measure Cd(II) and Pb(II) in freshwater samples from the Paraná River. The method was validated through a comparative analysis with a standard reference material (1643e). © 2013 Elsevier B.V. © 2013 Elsevier B.V. All rights reserved.
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Adsorbent, Aqueous samples, Castor leaf powder, Chemisorption, Metals ions, Adsorption kinetics, Comparative analysis, Enrichment factors, Pseudo-second order model, Reactive surfaces, Standard reference material, Adsorbents, Fourier transform infrared spectroscopy, Lead, Nitrogen, Powder metals, Adsorption
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Applied Surface Science, v. 276, p. 24-30.