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. 2021 Dec 24;46(2):550-566.
doi: 10.3906/kim-2110-41. eCollection 2022.

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

Kübra Turan  1 , Rukiye Saygili Canlidinç  1 , Orhan Murat Kalfa  1
Affiliations

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

Kübra Turan et al. Turk J Chem. .

Abstract

In this study, preconcentration conditions of trace amounts of copper ions were investigated with solid-phase extraction (SPE) method by synthesizing activated carbon-based ion-imprinted sorbent (Cu(II)-IAC) with a novel and selective approach. Flame atomic absorption spectrometry (FAAS) was used for the determination of metal ions concentrations. For the characterization of the sorbents, scanning electron microscopy, energy dispersive X-ray (SEM/EDX) analysis, and Fourier transform infrared spectroscopy (FTIR) were used. Optimum conditions for the SPE procedure, various parameters such as pH value, eluent type and concentration, sample volume, sample flow rate, adsorption capacity, and selectivity were studied. The adsorption isotherm was analyzed by Freundlich and Langmuir isotherm, and the maximum adsorption capacity was found to be 142.9 and 312.5 mg/g for activated carbon-based nonimprinted (Cu(II)-non-IAC) and Cu(II)-IAC sorbents, respectively from the Langmuir isotherm. Limit of determination (LOD) and limit of quantification (LOQ) values were found to be 0.038 and 0.113 μg/L, respectively for Cu(II)-IAC sorbent, and the results were compared with the literature. The accuracy and validity of the proposed method were evaluated by the determination of Cu(II) ions from tap water samples and certified reference materials (CRMs) (soft drinking water ERML-CA021e and NIST 1643e) analysis. Good and quantitative recoveries were obtained for the spiked analysis.

Keywords: Copper; flame atomic absorption spectrometry (FAAS); preconcentration; selectivity; surface-ion imprinting technique.

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Figures

Figure 1
Figure 1
FTIR spectrum of (a) AC, (b) AC-COOH, (c) Cu(II)-IAC and (d) Cu(II)-non-IAC sorbents.
Figure 2
Figure 2
SEM images of (a) AC, (b) AC-COOH, (c) Cu(II)-IAC prior to imprinting, (d) Cu(II)-IAC, and (e) Cu(II)-non-IAC sorbents.
Figure 3
Figure 3
EDX images of (a) Cu(II)-IAC prior to imprinting, (b) Cu(II)-IAC, and (c) Cu(II)-non-IAC sorbents.
Figure 4
Figure 4
TGA/DTA images of (a) Cu(II)-IAC prior to imprinting, (b) Cu(II)-IAC, and (c) Cu(II)-non-IAC sorbents.
Figure 5
Figure 5
Effect of pH value on the recovery of Cu(II) ions from Cu(II)-IAC sorbent (sorbent dosage: 100 mg, analyte concentration: 0.5 mg/L, flow rate 2 rpm, sample volume: 25 mL, eluent: 0.5 mol/L HNO3).
Figure 6
Figure 6
Effect of sample flow rate on the recovery of Cu(II) ions from Cu(II)-IAC sorbent (sorbent dosage: 100 mg, analyte concentration: 0.5 mg/L, pH: 5, sample volume: 25 mL, eluent: 0.5 mol/L HNO3).
Figure 7
Figure 7
Effect of sample volume on the recovery of Cu(II) ions from Cu(II)-IAC sorbent (sorbent dosage: 100 mg, analyte amount: 12.5 μg, flow rate 48 rpm, eluent: 0.5 mol/L HNO3).
Figure 8
Figure 8
The Freundlich isotherm graph.
Figure 9
Figure 9
The Langmuir isotherm graph.
See this image and copyright information in PMC

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