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J Sep Sci ; 39(7): 1371-8, 2016 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-26841822

RESUMO

A tailor-made Cu(II) ion-imprinted polymer based on large-surface-area graphene oxide sheets has been synthesized for the preconcentration and determination of trace copper from food samples by solid-phase extraction. Attributed to the ultrahigh surface area and hydrophilicity of graphene oxide, the Cu(II) ion-imprinted polymer prepared by the surface ion-imprinting technique exhibited a high binding capacity and a fast adsorption rate under the optimized experimental conditions. In the static adsorption experiments, the maximum adsorption capacity of Cu(II) ion-imprinted polymer is 109.38 mg/g at 25°C, which is much higher than that of the nonimprinted polymer (32.12 mg/g). Meanwhile, the adsorption is very rapid and equilibrium is reached after approximately 30 min. The adsorption mechanism is found to follow Langmuir adsorption model and the pseudo-second-order adsorption process. The Cu(II) ion-imprinted polymer was used for extracting and detecting Cu(II) in food samples combined with graphite flame atomic adsorption spectrometry with high recoveries in the range of 97.6-103.3%. The relative standard deviation and limit of detection of the method were evaluated as 1.2% and 0.37 µg/L, respectively. The results showed that the novel absorbent can be utilized as an effective material for the selective enrichment and determination of Cu(II) from food samples.


Assuntos
Cobre/análise , Cobre/isolamento & purificação , Análise de Alimentos/métodos , Contaminação de Alimentos/análise , Grafite/química , Óxidos/química , Polímeros/química , Adsorção , Análise de Alimentos/instrumentação , Concentração de Íons de Hidrogênio , Íons/análise , Impressão Molecular , Tamanho da Partícula , Extração em Fase Sólida , Propriedades de Superfície
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