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

• Authors: Elton Souza , Valtair Cristante , Pedro Padilha , Sonia Jorge , Marco Martines , Rafael Silva , Devaney Carmo , Gustavo Castro
• Languages of publication: EN

Abstracts

EN

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-chloropropyltrimethoxysilane. 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 m2 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 φ 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.

Keywords

EN

2, 2-Bipyridine; silica gel; adsorption; metal ions

• Publisher: De Gruyter Open
• Journal: Polish Journal of Chemical Technology
• Year: 2011
• Volume: 13
• Issue: 4
• Pages: 28-33

Dates

published

1 - 1 - 2011

online

2 - 1 - 2012

Contributors

author

Elton Souza

• Departamento de Física e Química, FEIS/UNESP-Univ. Estadual Paulista, C.P. 31, 15385-000, Ilha Solteira, SP, Brazil

author

Valtair Cristante

• Departamento de Química e Bioquímica, IB-UNESP-Univ. Estadual Paulista, C.P.510, 18618-000 Botucatu, SP, Brazil

author

Pedro Padilha

author

Sonia Jorge

• Departamento de Química e Bioquímica, IB-UNESP-Univ. Estadual Paulista, C.P.510, 18618-000 Botucatu, SP, Brazil

author

Marco Martines

• Departamento de Química, UFMS, C.P. 549, 79074-460, Campo Grande, MS, Brazil

author

Rafael Silva

• Departamento de Química e Bioquímica, IB-UNESP-Univ. Estadual Paulista, C.P.510, 18618-000 Botucatu, SP, Brazil

author

Devaney Carmo

• Departamento de Física e Química, FEIS/UNESP-Univ. Estadual Paulista, C.P. 31, 15385-000, Ilha Solteira, SP, Brazil

author

Gustavo Castro

• Departamento de Química e Bioquímica, IB-UNESP-Univ. Estadual Paulista, C.P.510, 18618-000 Botucatu, SP, Brazil

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Identifiers

DOI

10.2478/v10026-011-0045-2