Selective Preconcentration of Trace Amounts of Cu(II) With Surface‐Imprinted Multiwalled Carbon Nanotubes

Abstract

In this study, a new sorbent is synthesized using surface imprinting technique. Cu(II)-imprinted multiwalled carbon nanotube sorbent (Cu(II)-IMWCNT) is used as the solid phase in the solid-phase extraction method. After the preconcentration procedure, Cu(II) ions are determined by high-resolution continuum source atomic absorption spectrometry. A total of 0.1 mol L À1 ethylenediaminetetraacetic acid (EDTA) is used to remove Cu(II) ions from the sorbent surface. The optimum experimental conditions for effective preconcentration of Cu(II), parameters such as pH, eluent type and concentration, flow rate, sample volume, sorbent capacity, and selectivity are investigated. The synthesized solid phase is characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. The maximum adsorption capacities of Cu(II)-IMWCNT and non-imprinted solid phases are 270.3 and 14.3 mg g À1 at pH 5, respectively. Under optimum experimental conditions for Cu(II) ions, the limit of detection is 0.07 μg L À1 and preconcentration factor is 40. In addition, it is determined to be reusable without significant decrease in recovery values up to 100 adsorption-desorption cycles. Cu(II)-IMWCNT have a high stability. To check the accuracy of the developed method, certified reference materials, and water samples are analyzed with satisfactory analytical results.

Preconcentration of trace amount Cu(II) by solid-phase extraction method usingactivated carbon-based ion-imprinted sorbent

“…SEM images were taken at certain stages of the synthesis in order to examine the porous structure of the synthesized material and to determine the morphology of the sorbents. The changes in the structure of the sorbents obtained by applying heat treatment in the presence of a dry air environment were examined in the graphs drawn as thermogravimetric analysis (TGA), differential thermogravimetric (DTG), and differential thermal analysis (DTA) against temperature [ 46 ].…”

Green multi-functional monomer based ion imprinted polymers for selective removal of copper ions from aqueous solution

“…Adsorption performance of G-HQ-C IIPs towards Cu(II) ions was compared especially in the maximum adsorption capacity and selectivity coefficient with other reported adsorbents, as summarized in Table S5 [8,20,24,[43][44][45][46][47][48][49]54]. As can be seen from the table, the values of adsorption capacity and selectivity coefficients for our G-HQ-C IIPs are comparable or higher than most previously reported Cu-IIPs, except that fabricated on the surface of graphene oxide(GO) [49] and multiwalled carbon nanotubes (MWCNTs) [54]. However, it should be noted that adsorption performance depended on the adsorbent components and structure.…”

“…However, it should be noted that adsorption performance depended on the adsorbent components and structure. For example, graphene oxide (GO) [49] and MWCNTs [54] owning super large specific surface area directly result in larger contact areas of adsorbents toward Cu(II) ions. In other words, the adsorption capacity of G-HQ-C IIPs can be further improved by introducing nanomaterial as carriers.…”