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Facile Synthesis of Co3O4 Disordered Circular Sheet for Selective Electrochemical Determination of Nitrite

Abstract

Electrochemical nitrite sensing property of cobalt oxide (Co3O4) modified glassy carbon electrode was investigated. Co3O4 has been prepared via a simple precipitation method. The physical, phase transformation, purity and morphological studies were confirmed by several characterization techniques including XRD, TGA, FT-IR, RAMAN, XPS, SEM, TEM and HRTEM. Particularly, Transmission Electron Microscopy studies revealed particle size in the range of 10 – 100 nm. Electrochemical techniques such as cyclic voltammetry and amperometry were employed to study the electrooxidation of primary environmental hazardous anion, nitrite (NO2-) on Co3O4/GCE. The sensitivities were found to be 0.318 µA mM-1 cm-2 and 0.600 µA mM-1 cm-2 corresponding to linear range from 6.6 µM to 3.0 mM and 3 mM to 13.83 mM, respectively with limit of detection (LOD) to be 0.22 µM. The electrochemical sensor selectively detects nitrite even in presence of common interferrants. The sensor also demonstrates reliable operational stability, long time stability and good antifouling properties. Detection of nitrite in real samples of milk and water with excellent recovery demonstrates the practical application of our proposed sensor.

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Publication details

The article was accepted on 10 Jun 2018 and first published on 11 Jun 2018


Article type: Paper
DOI: 10.1039/C8NJ02639D
Citation: New J. Chem., 2018, Accepted Manuscript
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    Facile Synthesis of Co3O4 Disordered Circular Sheet for Selective Electrochemical Determination of Nitrite

    R. Thangamuthu, S. Velayutham and A. M. Sanjib, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ02639D

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