Accumulation and voltammetric determination of cobalt at zeolite-modified electrodes

Ardakani, Mohammad Mazloum; Akrami, Zakyeh; Kazemian, Hossein; Zare, Hamid R.

doi:10.1134/s1061934808020147

Cited by 12 publications

(3 citation statements)

References 25 publications

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“…Two of the most common approaches appearing in the literature are related to the dispersion of zeolite microparticles within conducting carbon-based composite matrices or deposition of a zeolite-polymeric film (with or without carbon) on the solid-electrodes surface [ 32 ]. In both strategies, the application of graphite as an electron-conducting component of ZMEs has been reported so far [ 33 , 34 ]. To the best of our knowledge, the utilization of other carbon-based nanomaterials, such as carbon black (CB), has never been presented.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical sensor based on Ni-exchanged natural zeolite/carbon black hybrid nanocomposite for determination of vitamin B6

2021

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The utilization of environmentally friendly nanoporous natural zeolite exchanged with Ni2+ ions (NiZ) and conductive carbon black (CB) in the fabrication of a novel and selective voltammetric sensor of vitamin B6 (VB6) is presented. The used clinoptilolite-rich zeolite material and CB were characterized in terms of morphology and textural properties. The superior properties of Ni-zeolite/carbon black modified glassy carbon electrode (NiZCB-GCE), arising from the synergistic effect of combining the unique features of zeolite and conductive carbon black, were confirmed by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) measurements. In the determination of VB6 with the use of differential pulse voltammetry (DPV), the optimization of the pH value of supporting electrolyte and instrumental parameters, as well as the interference study were performed. Under optimized conditions, the oxidation peak current at the potential +0.72 V vs. Ag | AgCl | 3 M KCl reference electrode was linear to the VB6 concentration in the range 0.050 to 1.0 mg L−1 (0.30–5.9 μmol L−1) (R = 0.9993). The calculated limit of detection (LOD, S/N = 3), equal to 15 μg L−1 (0.09 μmol L−1), was much better compared to chemically modified electrodes with other carbon-based materials. The RSD for 0.5 mg L−1 was in the range 2.5–5.4% (n = 4). The developed NiZCB-GCE was successfully applied to the determination of VB6 in commercially available multivitamin dietary supplements, food, and water samples. The obtained recoveries ranged from 95 to 106%. Graphical abstract

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Section: Introductionmentioning

confidence: 99%

Electrochemical sensor based on Ni-exchanged natural zeolite/carbon black hybrid nanocomposite for determination of vitamin B6

2021

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“…Zeolites are crystalline microporous solids that contain many channel-networks proving molecular-sized cages and passageways for excellent steric control of reaction paths which is attributed to the pore geometry [24]. Both the undoped and transition metal-doped zeolite modified electrodes exhibited catalytic properties towards electrochemical determination of numerous analytes [25], [26], [27], [28], [29]. Nevertheless, to the best of our knowledge voltammetric determination of PCT in tablet samples using iron (III) exchanged zeolite/graphite composite modified glassy carbon electrode has not been reported.…”

Section: Introductionmentioning

confidence: 99%

Voltammetric determination of paracetamol in tablet formulation using Fe (III) doped zeolite-graphite composite modified GCE

Amare

2019

Heliyon

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Although paracetamol is known to have excellent safety profile at recommended therapeutic doses, health effects are also reported at acute overdoses. A sensitive and selective voltammetric method using Fe(III) encapsulated zeolite/graphite composite modified glassy carbon electrode is presented in this work for the determination of paracetamol in tablet formulations. In contrast to the unmodified electrode, a fourfold increase of cyclic voltammetric oxidative peak current paralleled by reduced potential difference ( ΔE p ) at the modified electrode confirmed electrocatalytic property of the modifier towards oxidation of paracetamol. The oxidative peak current showed linear dependence on concentration range 0.5–200 μM with R 2 and LOD of 0.9989 and 0.01 μM, respectively. The paracetamol content of four brands of tablet samples was found in the range 95.95 ± 0.23–103 ± 0.52% of the theoretical values. Recovery results between 94.54 ± 0.82 and 102 ± 0.34% for spiked paracetamol in tablet samples validated the selectivity of the method for determination of paracetamol in real samples.

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“…Replacing silicons by aluminum in a tectosilicate framework of zeolite, resulting a negative charge in the zeolite framework and consequently lead to bond alkaline or alkaline earth metals to its external surface of zeolite, electrostatically [6][7][8]. For example, adsorption of cations like Cu 2+ [9], Fe 3+ [10], Co 2+ [11], and As 3+ [12], are reported in recent years.…”

Section: Introductionmentioning

confidence: 99%

Immobilization of modified zeolite on polyethylene surface: characterization and its application toward phosphate removal and microalgae growth

2019

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Herein, firstly zeolite was modified with Na + and Fe 3+ ions and then immobilized on polyethylene surface to construction of modified zeolite coated surface (MZCS). The prepared MZCS was characterized by using XRD, ATR-FTIR, SEM and EDXA techniques and its ability toward phosphate removal was examined and compared with unmodified zeolite coated surface (ZCS). Affecting parameters on phosphate removal were investigated and our results showed the ZCS and MZCS achieved to 32.4% and 70.6% phosphate removal ability after 2 h, for 25.0 ppm phosphate at pH 7.0, respectively. The phosphate adsorption results very well fitted in the Langmuir isotherm model for both the ZCS and MZCS. The maximum adsorption capacity as 6.317 and 7.097 mg/g was observed for the ZCS and MZCS, respectively. Finally, the application of the ZCS and the MZCS for phosphate removal from wastewater and its effect on microalgae growth was tested in two media with three replications. Observed results were presented and discussed here.

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Accumulation and voltammetric determination of cobalt at zeolite-modified electrodes

Cited by 12 publications

References 25 publications

Electrochemical sensor based on Ni-exchanged natural zeolite/carbon black hybrid nanocomposite for determination of vitamin B6

Electrochemical sensor based on Ni-exchanged natural zeolite/carbon black hybrid nanocomposite for determination of vitamin B6

Voltammetric determination of paracetamol in tablet formulation using Fe (III) doped zeolite-graphite composite modified GCE

Immobilization of modified zeolite on polyethylene surface: characterization and its application toward phosphate removal and microalgae growth

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