Please use this identifier to cite or link to this item:
http://repositorio.unicamp.br/jspui/handle/REPOSIP/52675
Type: | Artigo de periódico |
Title: | 4-amine-2-mercaptopyrimidine modified silica gel applied in Cd(II) and Pb(II) extraction from an aqueous medium |
Author: | Pereira, AS Ferreira, G Caetano, L Castro, RSD dos Santos, A Padilha, PM Castro, GR |
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. |
Subject: | 4-amine-2-mercaptopyrimidine silica metal extraction aqueous medium |
Country: | Polónia |
Editor: | Versita |
Rights: | aberto |
Identifier DOI: | 10.2478/v10026-010-0002-5 |
Date Issue: | 2010 |
Appears in Collections: | Unicamp - Artigos e Outros Documentos |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
WOS000276732700002.pdf | 662.93 kB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.