Tailor‐made ion‐imprinted polymer based on functionalized graphene oxide for the preconcentration and determination of trace copper in food samples
- 4 February 2016
- journal article
- research article
- Published by Wiley in Journal of Separation Science
- Vol. 39 (7), 1371-1378
- https://doi.org/10.1002/jssc.201501145
Abstract
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.Keywords
Funding Information
- National Natural Science Foundation of China (21207051)
- Ph.D. Programs Foundation of Ministry of Education of China (20123227120015)
- China Postdoctoral Science Foundation (2012M511220)
- Special Financial Grant from the China Postdoctoral Science Foundation (2014T70488)
- Society Development Fund of Zhenjiang (SH2012021, SH2013110)
- Programs of Senior Talent Foundation of Jiangsu University (11JDG125)
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