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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.)

Attachment of 2,2-bipyridine onto a silica gel for application as a sequestering agent for copper, cadmium and lead ions from an aqueous medium

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Author(s):
Souza, Elton J. [1] ; Cristante, Valtair M. [2] ; Padilha, Pedro M. [2, 3] ; Jorge, Sonia M. A. [2] ; Martines, Marco A. U. [4] ; Silva, Rafael I. V. [2] ; Carmo, Devaney R. [1] ; Castro, Gustavo R. [2]
Total Authors: 8
Affiliation:
[1] Univ Estadual Paulista, FEIS UNESP, Dept Quim & Fis, BR-15385000 Ilha Solteira, SP - Brazil
[2] Univ Estadual Paulista, IB UNESP, Dept Quim, BR-18618000 Botucatu, SP - Brazil
[3] Univ Estadual Campinas, INCT Bioanalit, BR-13084971 Campinas, SP - Brazil
[4] Univ Fed Mato Grosso do Sul, Dept Quim, BR-79074460 Campo Grande, MS - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Polish Journal of Chemical Technology; v. 13, n. 4, p. 28-33, 2011.
Web of Science Citations: 10
Abstract

A method was developed to attach 2,2-bipyridine (BP) onto a silica gel surface by a two-step reaction. The first step consisted of a reaction between the matrix and a silylating agent, 3-chloropropyltrimeth-oxysilane. In the second step of the reaction, a ligand molecule was attached onto Si-CPTS, yielding the product Si-BP. The modified material contained 0.431 +/- 0.01 mmol of 2,2-bipyridine per gram of modified silica, as confirmed by FT-IR spectra of the proposed structure. The surface modification was characterized by the BET technique, which revealed a decrease in the surface area from 614 to 450 m(2) g(-1). The series of adsorption isotherms for the metal ions were adjusted to fit a modified Langmuir equation. The maximum number of moles of copper, cadmium and lead ions adsorbed was 0.64, 0.53, and 0.54 mmol g-1, respectively. The surface saturation was calculated as phi fraction and the values obtained, Cu(II) = 1.160, Cd(II) = 1.044 and Pb(II) = 0.997, suggest a type 1:1 metal-ligand complex. (AU)