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.

Synthesis of Graphite‐Based Ion‐Imprinted Polymer for the Selective Removal of Nitrate Ions

“…4 shows that the adsorption capacity of the adsorbents in evaluating the efficiency of G‐IIPs towards at the concentration of 600 mg L −1 G‐IIP possessed higher sorption ability (252.9 mg g −1 ) than G‐NIP (145.7 mg g −1 ), due to the specific binding cavities on the surface of the polymer complex. These cavities complemented the geometry of , allowing the functional group of G‐IIP to associate with 14, 26.…”

Synthesis of multidentate functional monomer for ion imprinting

“…The obtained polymer, ion‐imprinted polymer, can recognize template ions with high selectivity. Due to its stability, reusability, and selectivity to target ions [1], IIP has been widely used in enrichment and separation of metal ions [2–4], especially in the fields of membranes [5] and SPE [6–8]. In addition, not only can IIP be used to extract uranium from seawater [9], but it also plays an important role in radioactive protection [10] and preparation of radionuclide [11], which is of great significance in the development of radiochemistry.…”

Synthesis and Characterization of Surface Ion-imprinted Polymer Based on Mesoporous Silica SBA-15 for Selective Removal of Cu(II) from Aqueous Solutions

“…Meng et al [26] prepared cesium ion-imprinted polymer based on SBA-15 by RAFT polymerization strategies, the polymer exhibited more homogeneous and thin polymer layer with higher adsorption property than the polymer prepared using the free RAFT agent in solution . Liu et al [27] Tailor-made ion-imprinted polymer based on functionalized graphene oxide for the preconcentration and determination of trace copper in food samples. which achieve the excellent combination of support materials and surface imprinting technique.…”