A novel hybrid construction of MnMoO4 nanorods anchored graphene nanosheets; an efficient electrocatalyst for the picomolar detection of ecological pollutant ornidazole in water and urine samples

Venkatesh, Krishnan; Rajakumaran, Ramachandran; Chen, Shen‐Ming; Karuppiah, Chelladurai; Yang, Chun‐Chen; Ramaraj, Sayee Kannan; Ali, M. Ajmal; Al-Hemaid, Fahad M.A.; El-Shikh, Mohammad Suliman; Almunqedhi, Bander

doi:10.1016/j.chemosphere.2021.129665

Cited by 38 publications

(11 citation statements)

References 58 publications

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“…The LSV curves witnessed an increase in the oxidation current for pH 3–7 and a decrease in the response for pH 9–11. Therefore, the slope value obtained from Figure S4B (pH vs the corresponding peak potential) for 17β-estradiol (E 2 ) oxidation at Pt/Se/GCE was 46.3 mV pH –1 . These values roughly match the 59.1 mV pH –1 at 25 °C of the Nernst system, illuminating that the number of protons and electrons is equally involved in the anodic process of 17β-estradiol (E 2 ) …”

Section: Results and Discussionsupporting

confidence: 53%

“…Using the given equations, the charge-transfer coefficient (α) and the standard heterogeneous rate constant ( K s ) were determined for the irreversible electrode progression of 17β-estradiol (E 2 ) at Pt/Se/GCE. These values mark the prompt electron transfer kinetic process for the electrochemical oxidation of 17β-estradiol (E 2 ) at Pt/Se/GCE, and the estimated values are displayed in Table .…”

Section: Results and Discussionmentioning

confidence: 99%

“…where n is the number of electrons involved, F is the Faraday constant (96 485.3 C), R is the universal gas constant (8.314 J K −1 mol −1 ), T is the temperature (298 K), Δ is the slope value attained from Figure S3A, and E°is the formal potential earned from the intercept of Figure S3B. Using the given equations, the charge-transfer coefficient (α) 73 and the standard heterogeneous rate constant (K s ) 74 were determined for the irreversible electrode progression of 17β-estradiol (E 2 ) at Pt/Se/GCE. These values mark the prompt electron transfer kinetic process for the electrochemical oxidation of 17β-estradiol (E 2 ) at Pt/Se/GCE, and the estimated values are displayed in Table 1.…”

Section: Resultsmentioning

confidence: 99%

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Pt Nanoparticle-Decorated Se Rods for Electrochemical Detection of 17β-Estradiol and Methanol Oxidation

Amalraj

Murthy

Wang

2022

ACS Appl. Nano Mater.

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Fabricating platinum (Pt) nanoparticle-draped selenium (Se) rods over the spacious region of glassy carbon electrodes could stimulate an impressive electrocatalytic activity owing to the synergic effect and interfacial property between Pt and Se, the oxophilic property and the anchoring effect of Se, the electron confinement effect, and the surface-to-volume ratio possessed by Pt. Examination of the structure and morphology highlights the physical and chemical properties of the Pt/Se catalyst, as revealed by different physicochemical characterization techniques. From these characterizations, we identified a dual-functional electrocatalyst Pt/Se for electrochemical detection of 17β-estradiol (E2) and methanol oxidation. When used for the electrochemical detection of estradiol, the Pt/Se catalyst displays an excellent response toward electro-oxidation of estradiol in the linear sweep voltammetry (LSV) and the amperometry-it technique. The proposed sensor utilizes a concentration range that varies from 0.05 to 85.5 μM with good sensitivity (0.0376 mA μM–1 cm–2), a lower limit of detection (LOD) being 11.12 nmol L–1, and the limit of quantitation (LOQ) being 36.06 nmol L–1. It yields lower detection limits (LODs: 13.17 and 17.04 nmol L–1) even on detecting estradiol in environmental water samples (river and tap water samples) at a buffered pH of 7.0. In the methanol oxidation reaction (MOR), the Pt/Se catalyst displays a good mass activity and turnover number (TON) of 2.37 A/mg and 1.36 s–1, respectively, by cyclic voltammetry and chronoamperometry. As a result, the prepared Pt/Se electrocatalyst, has provided a creditable combination of stability, electron transfer rate, conductivity, and dual applicability to the electrochemical sensor and the methanol oxidation fuel cell for the first time.

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Section: Results and Discussionsupporting

confidence: 53%

Section: Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Pt Nanoparticle-Decorated Se Rods for Electrochemical Detection of 17β-Estradiol and Methanol Oxidation

Amalraj

Murthy

Wang

2022

ACS Appl. Nano Mater.

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“…These peaks are three primary characteristic bands of the MMO. 33 In the CNT-based composite, along with the red-shi compared to the MMO peaks, two extra peaks clearly appear. By carefully tracking the positions of the main peak of the MMO at 936 cm À1 , it is clear that the value reaches 927 cm À1 in the composite one.…”

Section: Resultsmentioning

confidence: 97%

Synthesis of manganese molybdate/MWCNT nanostructure composite with a simple approach for supercapacitor applications

2022

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“…The peak obtained in the forward sweep is related to the electrochemical reduction of SCZ-NO 2 to SCZ-NHOH with the transfer of 4e − and 4H + . The small peak in the reverse scan represents the conversion of the hydroxylamine group (SCZ-NHOH) to the nitroso group (SCZ-NO), as illustrated in Scheme 2 [32,33]. As shown in Figure 5A, the SCZ is effectively reduced at the bare GCE, giving rise to a cathodic peak current of 3.60 µA with the reduction peak potential centred at −0.633 V. Interestingly, when the GCE is modified with SnO 2 , it shows a higher peak current than the bare GCE, but the reduction peak potential is shifted to more negative potentials.…”

Section: Electrochemical Reduction Of Sczmentioning

confidence: 99%

Fabrication of a Selective Sensor Amplification Probe Modified with Multi-Component Zn2SnO4/SnO2 Heterostructured Microparticles as a Robust Electrocatalyst for Electrochemical Detection of Antibacterial Drug Secnidazole

et al. 2021

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In this study, we synthesized heterostructured zinc stannate/tin oxide microparticles (ZTO/TO MPs) by a simple coprecipitation method and used them as an effective electrode material for the electrochemical detection of the antibacterial drug secnidazole (SCZ). The as-prepared ZTO/TO MPs were characterized by XRD, Raman, FE-SEM, HR-TEM, EDX, and XPS analyses. The physiochemical studies clearly proved that the fabricated ZTO/TO MPs were formed in a heterostructure phase without other impurities. A glassy carbon electrode modified with the synthesized ZTO/TO MPs showed an excellent and improved electrocatalytic activity in the electrochemical reduction of SCZ. Using differential pulse voltammetry (DPV), an impressive linear calibration range, extending from 0.01 to 193 μM, was observed, coupled with a detection limit of 0.0054 μM and a sensitivity of 0.055 μA/μM. In addition, the ZTO/TO MPs/GCE showed very good selectivity for the detection of SCZ in the presence of a number of biological, inorganic, and structurally related compounds. Finally, the ZTO/TO MPs/GCE was investigated for the analysis of SCZ in human blood serum samples. A very good recovery was obtained when spiking the blood serum with SCZ, highlighting the good applicability of the ZTO/TO MPs/GCE for the electrochemical analysis of SCZ in complex biological samples.

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A novel hybrid construction of MnMoO4 nanorods anchored graphene nanosheets; an efficient electrocatalyst for the picomolar detection of ecological pollutant ornidazole in water and urine samples

Cited by 38 publications

References 58 publications

Pt Nanoparticle-Decorated Se Rods for Electrochemical Detection of 17β-Estradiol and Methanol Oxidation

Pt Nanoparticle-Decorated Se Rods for Electrochemical Detection of 17β-Estradiol and Methanol Oxidation

Synthesis of manganese molybdate/MWCNT nanostructure composite with a simple approach for supercapacitor applications

Fabrication of a Selective Sensor Amplification Probe Modified with Multi-Component Zn2SnO4/SnO2 Heterostructured Microparticles as a Robust Electrocatalyst for Electrochemical Detection of Antibacterial Drug Secnidazole

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