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Research Article | Open Access

Cyclic Voltammetry Study for MnO2 Nanoparticles Modified Carbon Paste Electrode

Emad Salaam Abood1(), Mothana Salih Mashkoor2, Amer Mousa Jouda2
Department of Medical physics, Hilla University College, Babylon, Iraq
Department of Chemistry, Faculty of Science, University of Kufa, An-Najaf, Iraq
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Abstract

An electrical method was prepared for the measurement of Mn with trace amount in drugs and for the assessment of a sensitive method in comparison with spectrometric and atomic analyzer by a new carbon paste electrode modified with MnO2 nanoparticles. The method was used to study the electro oxidation of manganese ions in solution by cyclic voltammetry (CV) method. The modified electrode displayed strong resolving function for the overlapping voltammetric response of Mn-ion into one well-defined peak. The potential difference between Epa and Epc was > 200 mV; this range referred to the quise-reversible mechanism. The kinetic of electrode was studied at the temperature range from 15 – 35 ℃; the data of voltamograms showed the increase of temperature caused increase of negative shift, which suggested the diffusion electron transferred in the redox process of Mn-ion oxidation. Diffusion coefficient was calculated from the Randles-Sevcik equation and was equal to 1×10-7; the rate constant K was equal to 5.3×10-5; the peak current of Mn-ion increased linearly with its concentration at the range of 0.5 – 4.5 ppm.

Keywords

MnO2 nanoparticlesMnO2 nanoparticlesOxidation-reductionCarbon past electrodes

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Nano Biomedicine and Engineering
Volume 11 Issue 4,
December 2019
Pages 368-374
DOI: 10.5101/nbe.v11i4.p368-374
Cite this article:
Abood ES, Mashkoor MS, Jouda AM. Cyclic Voltammetry Study for MnO2 Nanoparticles Modified Carbon Paste Electrode. Nano Biomedicine and Engineering, 2019, 11(4): 368-374. https://doi.org/10.5101/nbe.v11i4.p368-374
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Result of voltammograms of MnO2 nanoparticles electrode in the presence of 1 ppm of MnSO4 solution at different scan rates of 0.01, 0.02, 0.05, 0.1, and 0.2 V/s, respectively

υ(V/s)√υ (V/s)1/2Ipoxd1(A, 10-4)Fpoxd(A, V/s½, 10-4)Ipoxd2(A, 10-4)Fpoxd2(A, V/s½, 10-4)Ipred(A, 10-4)Fpred(A, V/s½, 10-4)
0.010.1006.58765.8702.18021.800-7.998-79.980
0.020.1419.09664.5102.73019.360-9.522-67.531
0.050.2239.75143.7263.78016.950-12.270-55.022
0.10.31511.53036.6034.89015.223-14.650-46.507
0.20.44721.33047.71810.40023.266-25.520-57.091

I-E data voltammograms for MnO2 nano electrode with different temperatures of 15, 20, 25, 30 and 35 ℃, with diffusion coefficient for each step

Temperature(K)1/T10-3EpaIpoxd1 (A, 10-4)Epa2Ipoxd2 (A, 10-4)EpcIpoxd A(10-4)E = Epa-Epc∆E = Epa2-Epc/2D. coefficient (cm2/s)Ln D
2883.470.3607.520-0.87711.4011.50417.10-1.144-1.1902.241-10-13-29.12
2933.410.3607.550-0.70112. 4201.32312.80-0.963-1.0122.678-10-13-28.94
2983.330.4296.690-0.6659.0991.0909.560-0.661-0.8871.447-10-13-29.54
3033.300.3907.560-0.7869.7311.37015.100-0.980-1.0781.666-10-13-29.422
3033.320.3317.570-0.8588.6251.32113.100-0.988-1.0891.318-10-13-29.657

Kinetic parameters of MnO2 nanoparticles electrode

Type of electrode∆E(kJ/mol)∆H(kJ/mol)∆G(kJ/mol)∆S(kJ/mol)K(s1, 10-5)D° × 10-7ΑK0
MnO2 nanoelectrode-68.92-6.79-95.30.2975.361.000.10.14

Results determined of real sample of drug by deferent method

MethodAnalyte, Mn (mg)Linear rangeFounded (ppm)RSD (%)
Cyclic voltammetry110-3 – 10+3 ppm0.6262.0
21.4974.5
2.51.9979.6
Coulometry10.08 – 5 ppm0.2121.0
21.1055.0
2.51.9979.2
Atomic radiation10.1 – 10+3 ppm0.7373.0
21.6281.0
2.52.1084.0

Results determined of stock solution by deferent method

MethodAnalyte, Mn (mg)Linear rangeFounded (ppm)RSD (%)
Cyclic voltammetry110-3 – 10+3 ppm0.8787.0
21.9095.0
2.52.3195.0
Coulometry10.08 – 5 ppm0.8181.0
21.8793.5
2.52.2088.0
Atomic radiation10.1 – 10+3 ppm0.9790.0
21.8893.5
2.52.3996.0