期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 391, 期 -, 页码 116-124出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2012.08.073
关键词
Ethanol fuel; Adsorption; Preconcentration; Determination method; Thermodynamic parameters
资金
- FAPESP-Fundacao de Amparo a Pesquisa do Estado de Sao Paulo [2011/18086-3]
- CNPq-Conselho Nacional de Desenvolvimento Cientifico e Tecnologico [304714/2009-7]
- CAPES
- CNPq
- FUNDECT
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.
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