4-amine-2-mercaptopyrimidine modified silica gel applied in Cd(II) and Pb(II) extraction from an aqueous medium
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
---|---|
Data(s) |
20/05/2014
20/05/2014
01/01/2010
|
Resumo |
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Processo FAPESP: 06/54946-9 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 (13)C and (29)Si 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 empty set values lead to the inference that the resulting metal ligand complex was type 1:1. |
Formato |
7-11 |
Identificador |
http://dx.doi.org/10.2478/v10026-010-0002-5 Polish Journal of Chemical Technology. Warsaw: Versita, v. 12, n. 1, p. 7-11, 2010. 1509-8117 http://hdl.handle.net/11449/10053 10.2478/v10026-010-0002-5 WOS:000276732700002 WOS000276732700002.pdf |
Idioma(s) |
eng |
Publicador |
Versita |
Relação |
Polish Journal of Chemical Technology |
Direitos |
closedAccess |
Palavras-Chave | #4-amine-2-mercaptopyrimidine #silica #metal extraction #aqueous medium |
Tipo |
info:eu-repo/semantics/article |