PVDF–ErGO–GRC electrode: A single setup electrochemical system for separation, pre-concentration and detection of lead ions in complex aqueous samples

Kunashegaran, Hamsawahini; Sathishkumar, Palanivel; Ahamad, Rahmalan; Yusoff, Abdull Rahim Mohd

doi:10.1016/j.talanta.2015.10.044

Cited by 20 publications

(5 citation statements)

References 28 publications

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“…A CeO2 nanoparticle-decorated graphene hybrid modified glassy carbon electrode had a LOD of 0.1057 nM for lead(II) using the differential pulse anodic stripping voltammetric (DPASV) method [20]. An electrochemically reduced graphene oxide-graphite reinforced carbon (ErGO-GRC) electrode was introduced with SWV (square wave voltammetry) and showed a detection limit of 0.09 nM for lead(II) [16]. …”

Section: Electroanalysis Performance Of Modified Cpes For Lead(ii) Dementioning

confidence: 99%

Efficient Use of Porous Hybrid Materials in a Selective Detection of Lead(II) from Aqueous Solutions: An Electrochemical Study

Zirlianngura

Tiwari

et al. 2017

Metals

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Due to health and pollution concerns of aquatic environments related to the presence of heavy metal toxic ions, the necessity of developing devices able to detect and to monitor such kinds of species has recently gained importance. Carbon paste electrodes (CPEs) a starting approach to obtain new ion-selective devices by supporting materials like bentonite and/or clay; which become sensitive to lead(II) when they are suitably modified by chemical treatments to obtain different hybrid materials. In this work, two natural clays and three different hybrid materials were produced and then were characterized by X-ray diffraction, scanning electron microscopy, and Fourier transform infrared spectroscopy to assess their physico-chemical properties. After this stage, the electrochemical characterization of the modified CPEs using hybrid materials was performed by cyclic voltammetry, using the standard Fe(CN) 6 4− /Fe(CN) 6 3− redox couple. Subsequently, this study performed electrochemical experiments on lead(II) containing solutions, to test the ability of the examined CPEs to detect this toxic ion present in very low amounts. Lead(II) exhibited a reversible two electron oxidation/reduction behaviour in the cyclic voltammetry analyses and a reasonably good linear behaviour of the current associated with the oxidation peak as a function of its concentration (5.0-40.0 µg/L). The detection limit was found to vary in the range of 3-5 µg/L for the different modified CPEs. The presence of several co-existing ions showed that an interference variation had occurred. These results, therefore, show a restriction of the selectivity of the electrode up to a certain extent in the lead(II) detection. Finally, tap water with spiked lead(II) was analyzed to verify the suitability of the electrodes in the low level detection of lead(II) from real matrix samples.

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Section: Electroanalysis Performance Of Modified Cpes For Lead(ii) Dementioning

confidence: 99%

Efficient Use of Porous Hybrid Materials in a Selective Detection of Lead(II) from Aqueous Solutions: An Electrochemical Study

Zirlianngura

Tiwari

et al. 2017

Metals

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“…This strategy significantly enhances the selectivity because of lesser chance of false positive results. 30 , 31 , 71 …”

Section: Results and Discussionmentioning

confidence: 99%

“…This strategy significantly enhances the selectivity because of lesser chance of false positive results. 30,31,71 As shown in Scheme 1, the addition of Cur at alkaline pH (9.54) to ZnOBt forms a red dispersed suspension. The enol form of Cur in non-polar and basic medium is prone to degradation.…”

Section: Resultsmentioning

confidence: 99%

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Sensitive Metal Oxide-Clay Nanocomposite Colorimetric Sensor Development for Aflatoxin Detection in Foods: Corn and Almond

Khansili

Krishna

2021

ACS Omega

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The work reports on zinc oxide bentonite nanocomposite (ZnOBt) chemical route synthesis, characterization, and investigation of curcumin (Cur) functionalization for a label-free colorimetric detection of total aflatoxins (AFs) in foods. XRD of ZnO nanoparticles (NPs) confirmed the wurtzite structure (2θ = 36.2°) and that of ZnOBt showed the intercalated interlayer composite phase. The Debye–Scherrer relation calculated the crystallite size as 20 nm (ZnO) and 24.4 nm (ZnOBt). Surface morphology by SEM exhibited flower-like hexagonal, rod-shaped ZnO NPs on the bentonite surface. Colorimetric reaction involved two-stage redox reactions between ZnOBt and dye Cur followed by AFs phenolic group and Zn(Cur)OBt. Cur gets oxidized at its diketone moiety in the presence of ZnOBt to form a red colored complex Zn(Cur)OBt, which further scavenge protons from AFs phenolic group, and gets oxidized to AFs-Zn(Cur)OBt (yellow). Binding of AFs-Zn(Cur)OBt is characterized by FT-IR ascribed to C–H bending (1966.615 cm –1 ), O–H stretching (3256.974 cm –1 ), and C=O stretching (1647.362 cm –1 ). 1 H NMR chemical shifts (δ) (ppm) showed an increase in proton at the aliphatic region (0 to 4.4) while removal of proton in ether at 4.4 to 6 regions. Job plot calculation using UV–Vis data resulted in a higher total AF binding coefficient of Zn(Cur)OBt ( K a = 3.77 × 10 6 mol –1 L) compared to Zn(Cur)O ( K a = 0.645 × 10 6 mol –1 L) as well as a molar ratio of 1:1 by the Benesi–Hildebrand plot equation. Corn and almond food samples showed the total AFs LOD of 2.74 and 4.34 ppb, respectively. The results are validated with standard LC/MS-MS in compliance with MRL value as per the regulatory standard (EU).The NP-based method is facile and rapid and hence can be utilized for onsite detection of total AFs in foods.

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“…In particular, glassy carbon has been widely used as an electrode due to its excellent electrical and mechanical properties [9]. Interestingly, electrochemical analysis based on chemically modified electrodes has proved to be a sensitive and selective method for the detection of various organic and inorganic pollutants [10]. Therefore, the development of modified electrodes with high conductivity, selectivity, sensitivity, stability and reusability for pollutant detection is a hot topic of research.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of a composite modified glassy carbon electrode: a highly selective, sensitive and rapid electrochemical sensor for silver ion detection in river water samples

et al. 2016

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In this study, glassy carbon electrode (GCE) was modified with multi-walled carbon nanotubes (MWCNTs), 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim]PF 6 ), N,N'-bis(2-hydroxyacetophenone)ethylenediamine (BZE) and Nafion to form a MWCNT-BZE-[bmim]PF 6 -Nafion-GCE. The electrochemical behaviour of the modified electrode with respect to silver (Ag(I)) ion detection was studied by cyclic voltammetry (CV) and differential pulse anodic stripping voltammetry (DPASV). Further, the experimental parameters including pH value of Britton-Robinson Buffer (BRB), Nafion, MWCNTs, BZE and ([bmim]PF 6 ) concentrations and the deposition potential and time were optimized. The detection limit of the modified electrode for Ag(I) ion was found to be 70 ng L −1 (6.49 × 10 -10 mol L -1 ). Repetitive measurements revealed good reproducibility with relative standard deviation (RSD) value 0.4%. The system performance of modified electrode was highly satisfactory and the recoveries for the river water samples were found to be 96-121%. This study proved that, MWCNT-BZE-[bmim]PF 6 -Nafion-GCE is a highly selective and sensitive modified electrode for the detection of Ag(I) ion in river water samples with good recovery value.recoveries of the samples were found in the range of 96-120%. Furthermore, similar recovery values and detection limits were observed in both ICP-MS and DPASV using MWCNT-BZE-[bmim]PF 6 -Nafion-GCE.

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PVDF–ErGO–GRC electrode: A single setup electrochemical system for separation, pre-concentration and detection of lead ions in complex aqueous samples

Cited by 20 publications

References 28 publications

Efficient Use of Porous Hybrid Materials in a Selective Detection of Lead(II) from Aqueous Solutions: An Electrochemical Study

Efficient Use of Porous Hybrid Materials in a Selective Detection of Lead(II) from Aqueous Solutions: An Electrochemical Study

Sensitive Metal Oxide-Clay Nanocomposite Colorimetric Sensor Development for Aflatoxin Detection in Foods: Corn and Almond

Fabrication of a composite modified glassy carbon electrode: a highly selective, sensitive and rapid electrochemical sensor for silver ion detection in river water samples

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