Electrochemical Determination of 4-nitrophenol by manganese(II) Schiff base complex modified GCE

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S. Praveen Kumar, S. Munusamy, S. Muthamizh, A. Padmanaban, T. Dhanasekaran, G. Gnanamoorthy, V. Narayanan (2017). Electrochemical Determination of 4-nitrophenol by manganese(II) Schiff base complex modified GCEMechanics, Materials Science & Engineering, Vol 10. doi:10.2412/mmse.56.69.941

Authors: S. Praveen Kumar, S. Munusamy, S. Muthamizh, A. Padmanaban, T. Dhanasekaran, G. Gnanamoorthy, V. Narayanan

ABSTRACT. A selective and sensitive electrochemical determination method was developed for the determination of 4-nitrophenol by manganese (II) Schiff base complex modified glassy carbon electrode (GCE). The manganese (II) Schiff base complex was synthesized by a simple green chemical route and it was characterized by FT-IR, Raman, UV-Visible and fluorescence spectral techniques. The electrochemical redox behaviour of manganese (II) Schiff base complex was examined in acetonitrile solution with the aid of cyclic voltammetry. The electrochemical behaviour of 4-nitophenol at both electrodes were investigated thoroughly in acetate buffer solution at pH-5. The 4-nitrophenol yields an sharp reduction as well as an oxidation peaks at manganese (II) Schiff base complex modified GCE. The well define redox peaks at modified GCE has lower potential and higher peak current than bare GCE. Based on the electrocatalyitc redox observations of 4-nitrophenol we can propose an electrocatalytic sensor for the 4-NP direct determination in real sample analysis. In the electrochemical determination process various kinetic parameters were calculated, such as number of electron and proton transfer, rate constant etc., differential pulse voltammetry technique was utilized for the determination of 4-NP. Under the optimization conditions the peak current various linearly with the concentration of 4-nitrophenol in the range of 8 μM to 166 μM. The detection limit of the proposed electrocatalytic sensing method is 0.457 μM with the sensitivity of 6.2354 μA/μM. Moreover, the fabricated electrocatalytic sensor has high selectivity and long-term stability. This proposed electrocatalyitc sensor can be used for the determination of 4-NP in real water samples analysis.

Keywords: manganese (II) Schiff base complex, microwave irradiation, 4-nitrophenol, differential pulse voltammetry, electrochemical polymerization

DOI 10.2412/mmse.56.69.941

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