Synthesis and characterization of polyhedral oligomeric silsesquioxanes and their ...
| Full text | |
| Author(s): |
Soares, Isaac V.
[1]
;
Vieira, Eduardo G.
[1]
;
do Carmo, Devaney R.
[1]
;
Dias Filho, Newton L.
[1]
Total Authors: 4
|
| Affiliation: | [1] Unesp Univ Estadual Paulista, Dept Fis & Quim, BR-15385000 Ilha Solteira, SP - Brazil
Total Affiliations: 1
|
| Document type: | Journal article |
| Source: | Microchemical Journal; v. 110, p. 120-126, SEP 2013. |
| Web of Science Citations: | 11 |
| Abstract | |
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) | |
| 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 |