4-amine-2-mercaptopyrimidine modified silica gel applied in Cd(II) and Pb(II) extraction from an aqueous medium
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Data
2010-01-01
Autores
Pereira, Adriano S. [UNESP]
Ferreira, Guilherme [UNESP]
Caetano, Laercio [UNESP]
Castro, Renata S. D.
dos Santos, Ademir
Padilha, Pedro M. [UNESP]
Castro, Gustavo R. [UNESP]
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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.
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4-amine-2-mercaptopyrimidine, silica, metal extraction, aqueous medium
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Polish Journal of Chemical Technology. Warsaw: Versita, v. 12, n. 1, p. 7-11, 2010.