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Type: Artigo de periódico
Title: Preparation Of Sio2/nb2o5/zno Mixed Oxide By Sol-gel Method And Its Application For Adsorption Studies And On-line Preconcentration Of Cobalt Ions From Aqueous Medium
Author: Diniz K.M.
Gorla F.A.
Ribeiro E.S.
Nascimento M.B.O.D.
Correa R.J.
Tarley C.R.T.
Segatelli M.G.
Abstract: A new Nb2O5/ZnO mixed oxide dispersed in a silica matrix (i.e., SiO2/Nb2O5/ZnO) was synthesized via sol-gel method and used as an adsorbent of cobalt ions (Co2+). The material presented a high surface area (323m2g-1) and the maximum adsorption capacity was found to be 0.518mgg-1, determined from the non-linear Langmuir-Freundlich isotherm model. The material was used as a chelating agent free-solid phase extractor (CAF-SPE) in an on-line preconcentration procedure, based on the adsorption of Co2+ ions (16.0mL, pH 7.4) at a high flow rate (8.0mLmin-1) onto a mini-column packed with the adsorbent (200mg). The analyte was then eluted with 1.0molL-1 HCl and transported toward the FAAS detector. Linear calibration range was obtained from 0.96 up to 150.0μgL-1, with a limit of detection of 0.28μgL-1. The precision of method, estimated as relative standard deviation of ten replicate measurements of 30 and 150μgL-1 analyte solutions, was found to be 4.6% and 3.1%, respectively. The reliability of method was verified through the analysis of water and food samples and the accuracy was confirmed by using a certified reference material. © 2013 Elsevier B.V.
Editor: Elsevier
Rights: fechado
Identifier DOI: 10.1016/j.cej.2013.11.027
Date Issue: 2014
Appears in Collections:Unicamp - Artigos e Outros Documentos

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