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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.)

Preconcentration and determination of metal ions from fuel ethanol with a new 2,2 `-dipyridylamine bonded silica

Texto completo
Autor(es):
Vieira, Eduardo G. [1] ; Soares, Isaac V. [1] ; Dias Filho, Newton L. [1] ; da Silva, Nileia C. [1] ; Garcia, Edemir F. [1] ; Bastos, Andrea C. [1] ; Perujo, Sergio D. [1] ; Ferreira, Tamires T. [1] ; Rosa, Andre H. [2] ; Fraceto, Leonardo F. [2]
Número total de Autores: 10
Afiliação do(s) autor(es):
[1] Univ Estadual Paulista, UNESP, Dept Quim & Fis, BR-15385000 Ilha Solteira, SP - Brazil
[2] Univ Estadual Paulista, UNESP, Dept Engn Ambiental, BR-18087180 Sorocaba, SP - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Journal of Colloid and Interface Science; v. 391, p. 116-124, FEB 1 2013.
Citações Web of Science: 28
Resumo

A silica surface chemically modified with {[}3-(2,2'-dipyridylamine) propyl] groups was prepared, characterized, and evaluated for its metal ion preconcentration in fuel ethanol. To our knowledge, we are the first authors who have reported the present modification on silica gel surface. The material was characterized using infrared spectra, scanning electronic microscopy, and C-13 and Si-29 solid-state NMR spectra. Batch and column experiments were conducted to investigate for metal ion removal from fuel ethanol. The results showed that the Langmuir model describes the sorption equilibrium data of the metal ions in a satisfactory way. From the Langmuir isotherms, the following maximum adsorption capacities (in mmol g(-1)) were determined: 1.81 for Fe(III), 1.75 for Cr(III), 1.30 for Cu(II), 1.25 for Co(II), 1.15 for Pb(II), 0.95 for Ni(II), and 0.87 for Zn(II). Thermodynamic functions, the change of free energy (Delta G), enthalpy (Delta H), and entropy (Delta S) showed that the adsorption of metal ions onto Si-Pr-DPA was feasible, spontaneous, and endothermic. The sorption-desorption of the metal ions made possible the development of a preconcentration and quantification method of metal ions in fuel ethanol. (C) 2012 Elsevier Inc. 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