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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.)

Synthesis, characterization, and application of modified silica in the removal and preconcentration of lead ions from natural river water

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Author(s):
Ferreira, Guilherme [1] ; Caetano, Laercio [2] ; Castro, Renata S. D. [3] ; Padilha, Pedro Magalhaes [1] ; Castro, Gustavo Rocha [1]
Total Authors: 5
Affiliation:
[1] Univ Estadual Paulista, IB UNESP, Dept Quim & Bioquim, BR-18618000 Botucatu, SP - Brazil
[2] Univ Estadual Paulista, Dept Fis & Quim, FEIS UNESP, BR-15385000 Ilha Solteira, SP - Brazil
[3] Univ Estadual Paulista, Dept Fitotecnia Tecnol Alimentos & Socio Econ, FEIS UNESP, BR-15385000 Ilha Solteira, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Clean Technologies and Environmental Policy; v. 13, n. 2, p. 397-402, APR 2011.
Web of Science Citations: 11
Abstract

This paper describes the synthesis, modification, and application of modified silica for the removal of lead ions from aqueous medium. The modification reaction provided a reduction in surface are from 737 to 399 m(2) g(-1), which was attributed to the 4-amine-2-mercaptopyrimidine molecule attachment onto its surface. The characterization through FTIR spectra demonstrated bands at 3347 cm(-1) assigned to N-H stretching vibrations and the absence of thiol bands at 2600 e 2547 cm(-1) at Si-mod spectrum is an indicative that the attachment occurred via SH groups. The linearization of adsorption isotherm data through the modified Langmuir equation resulted in a maximum adsorption capacity of 2.9 mu mol g(-1). The material was applied in a continuous flow system in the preconcentration of water samples from Parana River and the results were in agreement with metal concentration determined directly through atomic absorption spectrometry with graphite furnace. The method validation was performed through analysis of water standard reference material (1643e), which also presented a 7.2-fold enrichment factor. (AU)