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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Solid-phase extraction of metal ions from fuel ethanol with a nanostructured adsorbent

Texto completo
Autor(es):
Soares, Isaac V. [1] ; Vieira, Eduardo G. [1] ; do Carmo, Devaney R. [1] ; Dias Filho, Newton L. [1]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Unesp Univ Estadual Paulista, Dept Fis & Quim, BR-15385000 Ilha Solteira, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: Microchemical Journal; v. 110, p. 120-126, SEP 2013.
Citações Web of Science: 11
Resumo

This work describes the synthesis and characterization of a new octakis{[}3-(2,2'-dipyridylamine)propyl] octasilsesquioxane (T-8-Pr-DPA), and a study of the metal ion preconcentration in fuel ethanol. Batch and column experiments were conducted to investigate for the removal of heavy metal ions from fuel ethanol. The results showed that the Langmuir allowed to describe the sorption equilibrium data of the metal ions on T8-Pr-DPA in a satisfactory way. The following maximum adsorption capacities (in mmol g(-1)) were determined: 3.62 for Fe (III), 3.32 for Cr (III), 2.15 for Cu (II), 1.80 for Co (II), 1.62 for Pb (II), 1.32 for Ni (II) and 0.88 for Zn (II). The thermodynamic parameters for the adsorption process such as free energy of adsorption (Delta G), enthalpy of adsorption (Delta H) and entropy of adsorption (Delta S) were calculated. Thermodynamic parameters showed that the system has favorable enthalpic, Gibbs free energy, and entropic values. The sorption-desorption of the metal ions has made possible the development of a preconcentration and determination method of metal ions at trace level in fuel ethanol. The method of quantitative analysis for Fe, Cu, Ni and Zn in fuel ethanol by Flame AAS was validated. Several parameters have been taken into account and evaluated for the validation of method, namely: linearity, limit of detection, limit of quantification, and the relative standard deviation and accuracy. The accuracy of the method was assessed by testing analyte recovery in the fuel ethanol samples. (C) 2013 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 11/18086-3 - Síntese e caracterização de híbridos inorgânico-orgânicos à base de silício: estudo de aplicação como adsorventes, catalisadores heterogêneos e modificadores de resinas epoxídicas
Beneficiário:Newton Luiz Dias Filho
Linha de fomento: Auxílio à Pesquisa - Regular