Citation: HE Bao-Shan, DU Geng-An. Rapid Detection of Semicarbazide Based on Glassy Carbon Electrode Modified with Carboxylated Multi-Walled Carbon Nanotubes[J]. Chinese Journal of Analytical Chemistry, ;2017, 45(10): 1511-1516. doi: 10.11895/j.issn.0253-3820.170101 shu

Rapid Detection of Semicarbazide Based on Glassy Carbon Electrode Modified with Carboxylated Multi-Walled Carbon Nanotubes

HE Bao-Shan ,
DU Geng-An

School of Food Science and Technology, Henan University of Technology, Zhengzhou 450001, China

Received Date: 19 February 2017
Revised Date: 13 July 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (No. 61301037)

A sensitive electrochemical sensor for the detection of semicarbazide (SEM) based on the glassy carbon electrode modified with carboxylated multi-walled carbon nanotube (CMWCNTs) was constructed in this work. The modified materials were characterized by Fourier transform infrared spectroscopy, transmission electron microscopy and electrochemical impedance spectroscopy. The results showed that the CMWCNTs exhibited a certain degree of changes, such as the appearance of the characteristic peaks of carbon oxygen double bonds in carboxyl group, a decrease in diameter and length and a remarkable reduction of the impedance value. The electrochemical behavior of SEM on CMWCNTs/GCE was investigated by cyclic voltammetry and amperometric i-t curve in 1 mol/L HAc-NaAc buffer solution. An irreversible oxidation peak of SEM appeared at CMWCNTs/GCE. Compared to the bare electrode, the current of the oxidation peak was significantly increased. Under the optimal conditions such as HAc-NaAc solution (pH 7) and scan rate of 0.1 V/s, the obtained sensor presented linear response to SEM concentration in the range of 5.0×10^-6 mol/L-1.09×10^-3 mol/L, the linear regression equation was I_p(μA)=-0.472+0.0599C (μmol/L) with linear correlation coefficient of 0.997. The detection limit was 1.88×10^-7 mol/L. At the same time, the recovery was from 92.8% to 98.0% in the test of pork liver samples.
- Carboxylation,
- Multi-walled carbon nanotubes,
- Glassy carbon electrode,
- Semicarbazide,
- Voltammetry
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