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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
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]
Total Authors: 10
Affiliation:
[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
Total Affiliations: 2
Document type: Journal article
Source: Journal of Colloid and Interface Science; v. 391, p. 116-124, FEB 1 2013.
Web of Science Citations: 28
Abstract

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)

FAPESP's process: 11/18086-3 - Synthesis and characterization of inorganic-organic hybrid based on silicon: study of application as adsorbents, heterogeneous catalysts and modifiers for epoxy resins
Grantee:Newton Luiz Dias Filho
Support type: Regular Research Grants