title: Tailor-made ion-imprinted polymer based on functionalized graphene oxide for the preconcentration and determination of trace copper in food samples.
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.
authors: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, China.
authors: Yan
authors: Y
authors: Liu
authors: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, China.
authors: Jian
authors: J
authors: Qiu
authors: School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, China.
authors: Zhanchao
authors: Z
authors: Liu
authors: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, China.
authors: Liang
authors: L
authors: Ni
authors: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, China.
authors: Yinhua
authors: Y
authors: Jiang
authors: Faculty of Science, Jiangsu University, Zhenjiang, China.
authors: Chongying
authors: C
authors: Gong
authors: School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, China.
authors: Xiangguo
authors: X
authors: Meng
authors: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, China.
authors: Fangfang
authors: F
authors: Liu
authors: School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, China.
authors: Guoxing
authors: G
authors: Zhong
mesh_terms: D000327:Adsorption; D003300:Copper / Q000032:analysis* / Q000302:isolation & purification*; D005504:Food Analysis / Q000295:instrumentation / Q000379:methods*; D005506:Food Contamination / Q000032:analysis*; D006108:Graphite / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007477:Ions / Q000032:analysis; D054802:Molecular Imprinting; D010087:Oxides / Q000737:chemistry*; D010316:Particle Size; D011108:Polymers / Q000737:chemistry*; D052616:Solid Phase Extraction; D013499:Surface Properties
chemical_list: D007477:Ions; D010087:Oxides; D011108:Polymers; D006108:Graphite; D003300:Copper
keywords: Copper; Graphene oxide composites; Ion-imprinted polymer; Solid-phase extraction