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

Autor(es)

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Polish Journal of Chemical Technology; v. 13, n. 4, p. 28-33, 2011.
• Citações Web of Science: 10

Resumo

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)

• Processo FAPESP: 06/54946-9 - Aplicação de sílicas, de diferentes porosidades e funcionalizadas com o ligante 4-amino-2-mercaptopirimidina, na pré-concentração de As, Hg, Cd, Cu, Pb e Se em amostras aquosas utilizando sistema em linha acoplado com FAAS/CV-AAS/HG-AAS
• Beneficiário: Gustavo Rocha de Castro
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores