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

被引:63
作者
Diniz, Kristiany Moreira [1 ]
Gorla, Felipe Augusto [1 ]
Ribeiro, Emerson Schwingel [2 ]
Olimpio do Nascimento, Marcela Betta [2 ]
Correa, Rodrigo Jose [2 ]
Teixeira Tarley, Cesar Ricardo [1 ,3 ]
Segatelli, Mariana Gava [1 ]
机构
[1] Univ Estadual Londrina, Dept Quim, Ctr Ciencias Exatas, BR-86057970 Londrina, PR, Brazil
[2] Univ Fed Rio de Janeiro, Inst Quim, BR-21941909 Rio De Janeiro, RJ, Brazil
[3] Univ Estadual Campinas, Inst Nacl Ciencia & Tecnol INCT Bioanalit, Inst Quim, UNICAMP,Dept Quim Analit, BR-13083970 Campinas, SP, Brazil
关键词
Cobalt; Water and food samples; SiO2/Nb2O5/ZnO; Preconcentration; FAAS; ATOMIC-ABSORPTION-SPECTROMETRY; PHASE EXTRACTION; HYBRID MATERIAL; TRACE-METALS; SILICA-GEL; SAMPLES; REMOVAL; RESIN; OPTIMIZATION; ENRICHMENT;
D O I
10.1016/j.cej.2013.11.027
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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 (323 m(2) g(-1)) and the maximum adsorption capacity was found to be 0.518 mg g(-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 (16.0 mL, pH 7.4) at a high flow rate (8.0 mL min(-1)) onto a mini-column packed with the adsorbent (200 mg). The analyte was then eluted with 1.0 mol L-1 HCl and transported toward the FAAS detector. Linear calibration range was obtained from 0.96 up to 150.0 mu g L-1, with a limit of detection of 0.281 mu g L-1. The precision of method, estimated as relative standard deviation of ten replicate measurements of 30 and 150 mu g L-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. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码:233 / 241
页数:9
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