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CARBONLETT, vol. 26, no. 1, pp.88-94, 2018

DOI: http://dx.doi.org/10.5714/CL.2018.26.088

Electrochemical oxidation-reduction and determination of urea at enzyme free PPY-GO electrode

Harish Mudila1,2, Parteek Prasher3, Sweta Rana2, Beena Khati4, and M.G.H. Zaidi2,♠

Affiliation: 1Department of Chemistry, G. B. Pant University of Agriculture & Technology, Pantnagar, Uttarakhand-263145, India
2Department of Chemistry, Lovely Professional University, Phagwara, Punjab-144411, India
3Department of Chemistry, University of Petroleum and Energy Studies, Dehradun, Uttarakhand-248007, India
- 4Department of Biotechnology, DBS Campus Bhimtal Kumaun University, Nainital, Uttarakhand-263136, India

Abstract: This manuscript explains the effective determination of urea by redox cyclic voltammet¬ric analysis, for which a modified polypyrrole-graphene oxide (PPY-GO, GO 20% w/w of PPY) nanocomposite electrode was developed. Cyclic voltammetry measurements revealed an effective electron transfer in 0.1 M KOH electrolytic solution in the potential window range of 0 to 0.6 V. This PPY-GO modified electrode exhibited a moderate electrocatalytic effect towards urea oxidation, thereby allowing its determination in an electrolytic solution. The linear dependence of the current vs. urea concentration was reached using square-wave voltammetry in the concentration range of urea between 0.5 to 3.0 μM with a relatively low limit of detection of 0.27 μM. The scanning electron microscopy was used to characterize the morphologies and properties of the nanocomposite layer, along with Fourier transform infrared spectroscopy. The results indicated that the nanocomposite film modified electrode exhibited a synergistic effect, including high conductivity, a fast electron-transfer rate, and an inherent catalytic ability.


Keyword: Polypyrrole, graphene oxide, polysulphone, urea, cyclic voltammetry, electro¬catalytic effect, limit of detection.