Sensitive electrochemical sensor based on poly(<scp>l</scp>-glutamic acid)/graphene oxide composite material for simultaneous detection of heavy metal ions

Yi, Wei; He, Zihua; Fei, Junjie; He, Xiaohua

doi:10.1039/c9ra01891c

Cited by 51 publications

(25 citation statements)

References 43 publications

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“…From Figure 6a it is possible to visualize a small displacement in the peak potential of the metal ion. This behavior has also been reported by other research groups [42–44], and can be assigned to the preconcentration of the analyte on the electrode surface in the initial stage, in which the analyte is adsorbed prior to stripping. It is worth mentioning that this does not interfere with the analytical determination of the analyte.…”

Section: Resultssupporting

confidence: 82%

A Selective Electrochemical Sensor for the Detection of Cd(II) Based on a Carbon Paste Electrode Impregnated with a Novel Ion‐imprinted Hybrid Polymer

et al. 2021

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An electrochemical sensor (CPE‐IIHP) was developed for Cd(II) using a carbon paste electrode (CPE) impregnated with an ion‐imprinted hybrid polymer (IIHP). A CPE‐NIHP was also prepared for comparison. DPASV was used to optimize the sensor response and quantify Cd(II). The sensor presented a wide linear range from low concentrations of Cd(II): 1 to 100 μg L−1 and high concentrations of Cd(II): 2.75 to 5.0 mg L−1. Ions such as Co(II), Pb(II), Ni(II), Zn(II), Fe(II), Fe(III), Sn(II) and Cu(II), showed no variation in the Cd(II) signal. The CPE‐IIHP was successfully applied in river and drinking water analysis, revealing the great potential for its application.

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Section: Resultssupporting

confidence: 82%

A Selective Electrochemical Sensor for the Detection of Cd(II) Based on a Carbon Paste Electrode Impregnated with a Novel Ion‐imprinted Hybrid Polymer

et al. 2021

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“…Over the most recent couple of years, the greater part of the information revealed shows the simultaneous identification of different heavy metal ions, which reflects the issue of selectivity (Gumpu et al, 2017;Ullah et al, 2018;Yi et al, 2019). In the present investigation, this problem is substantially resolved.…”

Section: Introductionmentioning

confidence: 79%

EDTA Modified PANI/GO Composite Based Detection of Hg (II) Ions

et al. 2020

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Electrochemical recognition of Hg (II) ions utilizing EDTA modified polyaniline (PANI)/Graphene Oxide (GO) composite is reported in the present communication. Graphene Oxide (GO) synthesis was carried out by a modified Hummer's method. Electrochemical characterizations, namely cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), were performed before and after modification of the composite. The topographies of the PANI/GO composite and EDTA_PANI/GO electrodes were studied using AFM. Roughness parameter values were compared for confirmation of surface modification. Fourier transform infrared spectroscopy (FTIR) was utilized for the compositional analysis of PANI/GO and EDTA_PANI/GO electrodes. The EDTA_PANI/GO composite exhibits sensitivity toward Hg (II) ions when probed using the differential pulse stripping voltammetry (DPSV) technique with a lower detection limit of 2 ppb. EDTA modified SS_PANI/GO composite (PANI/GO composite deposited on a stainless-steel substrate) showed superior sensitivity in the detection of Hg (II) ions. The sensitivity was observed to extend to 1 ppb, which is smaller than the maximum contaminant level (MCL) endorsed by the Environment Protection Agency (EPA, United States).

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“…The table reveals promising sensitivity of our alanine-based sensor than graphene, carbon nanotubes, silver, gold, and cadmium tellurium nanoparticles, nanocomposites, organic ligands, and polymers fabricated sensors, which means that our developed amino acid sensor can detect trace level concentrations of metal ions more effectively. 9,10,26,32−50…”

Section: Resultsmentioning

confidence: 99%

Amino Acid-Fabricated Glassy Carbon Electrode for Efficient Simultaneous Sensing of Zinc(II), Cadmium(II), Copper(II), and Mercury(II) Ions

et al. 2019

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Herein, we present a greener approach to achieve an ultrasensitive, selective, and viable sensor engineered by amino acids as a recognition layer for simultaneous electrochemical sensing of toxic heavy metals (HMs). Electrochemical techniques like electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and square-wave anodic stripping voltammetry (SWASV) were applied to demonstrate sensing capabilities of the designed analytical tool. The comparative results of different amino acids demonstrate alanine’s superior performance with a well-resolved and enhanced current signal for target metal ions due to strong complexation of its functional moieties. The working conditions for alanine-modified GCE were optimized by investigating the effect of alanine concentration, different supporting electrolytes, pH values, accumulation potentials, and time. The limits of detection for Zn2+, Cd2+, Cu2+, and Hg2+ were found to be 8.92, 5.77, 3.01, and 5.89 pM, respectively. The alanine-modified electrode revealed absolute discrimination ability, stability, and ultrasensitivity toward metal ions even in the presence of multifold interfering species. Likewise, greener modifier-designed electrodes possessed remarkable electrocatalytic activity, cost affordability, reproducibility, and applicability for picomolar level detection of HM ions in real water sample matrixes. Theoretical calculations for the HM–amino acid interaction also support a significantly improved mediator role of the alanine modifier that is consistent with the experimental findings.

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Sensitive electrochemical sensor based on poly(l-glutamic acid)/graphene oxide composite material for simultaneous detection of heavy metal ions

Abstract: A novel electrochemical sensor with high stability and good reproducibility for the simultaneous detection of heavy metal ions was prepared by using PGA/GO to modify the GCE, showing high sensitivity of superior to most of the reported values.

Cited by 51 publications

References 43 publications

A Selective Electrochemical Sensor for the Detection of Cd(II) Based on a Carbon Paste Electrode Impregnated with a Novel Ion‐imprinted Hybrid Polymer

A Selective Electrochemical Sensor for the Detection of Cd(II) Based on a Carbon Paste Electrode Impregnated with a Novel Ion‐imprinted Hybrid Polymer

EDTA Modified PANI/GO Composite Based Detection of Hg (II) Ions

Amino Acid-Fabricated Glassy Carbon Electrode for Efficient Simultaneous Sensing of Zinc(II), Cadmium(II), Copper(II), and Mercury(II) Ions

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