<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">This paper discusses silica surface modification by a process involving a two-step reaction: anchoring of a silylating agent, followed by an attachment of a 4-amino-2-mercaptopyrimidine molecule. The modified material (Si-BP) was successfully characterized by the FTIR spectra, which revealed amine absorption bands, and through 13C and 29Si NMR spectra, which confirm the proposed structure of the modified silica (Si-BP). Si-BP was used to extract cadmium and lead from an aqueous medium at 298 K. The Si-BP kinetics towards metal ions was very fast, i.e., about 10 minutes, although extraction was significantly impaired at pH 3. The series of adsorption isotherms were adjusted to a modified Langmuir equation and the maximum extraction capacity was 0.193 and 0.387 mmol g-1 for Cd(II) and Pb(II), respectively. An analysis of the Ø values lead to the inference that the resulting metal ligand complex was type 1:1.</abstract>

This paper discusses silica surface modification by a process involving a two-step reaction: anchoring of a silylating agent, followed by an attachment of a 4-amino-2-mercaptopyrimidine molecule. The modified material (Si-BP) was successfully characterized by the FTIR spectra, which revealed amine absorption bands, and through 13C and 29Si NMR spectra, which confirm the proposed structure of the modified silica (Si-BP). Si-BP was used to extract cadmium and lead from an aqueous medium at 298 K. The Si-BP kinetics towards metal ions was very fast, i.e., about 10 minutes, although extraction was significantly impaired at pH 3. The series of adsorption isotherms were adjusted to a modified Langmuir equation and the maximum extraction capacity was 0.193 and 0.387 mmol g-1 for Cd(II) and Pb(II), respectively. An analysis of the Ø values lead to the inference that the resulting metal ligand complex was type 1:1.

4-amine-2-mercaptopyrimidine modified silica gel applied in Cd(II) and Pb(II) extraction from an aqueous medium

Departamento de Física e Química, Universidade Estadual Paulista, C.P. 31, 15385-000, Ilha Solteira, SP, Brazil

Departamento de Fitotecnia e Tecnologia de alimentos, C.P. 31, 15385-000, Ilha Solteira, SP, Brazil

Departamento de Química Analítica, 14800-900, Araraquara, SP, Brazil

Dept. de Química e Bioquímica, IB-UNESP, C. P. 510, 18618-000 Botucatu, SP, Brazil

Instituto Nacional de Ciencia e Tecnologia de Bioanalítica/UNICAMP, C.P.6154,13084-971 Campinas, SP, Brazil

Polish Journal of Chemical Technology

This paper discusses silica surface modification by a process involving a two-step reaction: anchoring of a silylating agent, followed by an attachment of a...

4-amine-2-mercaptopyrimidine modified silica gel applied in Cd(II) and Pb(II) extraction from an aqueous medium

Published Online: Apr 08, 2010

Page range: 7 - 11

DOI: https://doi.org/10.2478/v10026-010-0002-5

Keywords
4-amine-2-mercaptopyrimidine, silica, metal extraction, aqueous medium

This content is open access.

4-amine-2-mercaptopyrimidine modified silica gel applied in Cd(II) and Pb(II) extraction from an aqueous medium

Published Online: Apr 08, 2010

Page range: 7 - 11

DOI: https://doi.org/10.2478/v10026-010-0002-5

Keywords4-amine-2-mercaptopyrimidine, silica, metal extraction, aqueous medium

This content is open access.

Keywords
4-amine-2-mercaptopyrimidine, silica, metal extraction, aqueous medium