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

Author(s)

Pereira, Adriano S. ^[1] ; Ferreira, Guilherme ^[1] ; Caetano, Laercio ^[1] ; Castro, Renata S. D. ^[2] ; dos Santos, Ademir ^[3] ; Padilha, Pedro M. ^{[4, 5]} ; Castro, Gustavo R. ^[1]

Affiliation

^[1] Univ Estadual Paulista, Dept Quim & Fis, BR-15385000 Ilha Solteira, SP - Brazil

^[2] Dept Fitotecnia & Tecnol Alimentos, BR-15385000 Ilha Solteira, SP - Brazil

^[3] Dept Quim Analit, BR-14800900 Araraquara, SP - Brazil

^[4] Univ Estadual Campinas, Inst Nacl Ciencia & Tecnol Bioanalit, BR-13084971 Campinas, SP - Brazil

^[5] UNESP, IB, Dept Quim & Bioquim, BR-18618000 Botucatu, SP - Brazil

• Document type: Journal article
• Source: Polish Journal of Chemical Technology; v. 12, n. 1, p. 7-11, 2010.
• Web of Science Citations: 22

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 (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. (AU)