Study on Electrochemical Behavior of Ortho-Aminophenol on Nano-Gold/Carbon Nanotubes Composite Modified Electrode

Study on Electrochemical Behavior of Ortho-Aminophenol on Nano-Gold/Carbon Nanotubes Composite Modified Electrode

Yingliang WeiAnting Wang Shengbin Wu 

Department of Environment Engineering and Chemistry, Luoyang Institute of Science & Technology, Luoyang, 471023, P. R. China

Corresponding Author Email:
18 September 2012
29 November 2012
14 February 2013
| Citation

The aim of this work was to construct a novel modified electrode based on Au nano-particles and carbon nanotube for study- ing the electrochemical behavior of ortho-aminophenol (OAP). A sensitive oxidation peak of OAP at the potential of 0.352V was observed in HAc-NaAc-PHP buffer solution. The effect factors of the electrochemical response of OAP were optimized by linear sweep voltammetry (LSV). Under the optimum conditions, a linear calibration curve of the peak current of OAP and concentration was obtained in the range of 4.0×10-7~2.0×10-4 mol/L. The oxidation peak current increases direct proportionally with the square root of scanning speed, which indicates that the electrochemical oxidation process of OAP on this modified electrode is diffusion-controlled process. The diffusion coeffi- cient (D) could be estimated and the result was 5.42×10-7 cm2·s-1 by employing chronocoulometry. The charge transfer rate constant (ks) was also discussed and the result was 7.85×10-4 cm·s-1. Concurrently, based on the experiment results, the electrode reaction process of OAP with one electron and one proton was proposed.


Ortho-aminophenol; Au nano-particles; Multi-walled carbon nanotube; Au electrode; Voltammetry

1. Introduction
2. Experiments
3. Results and Discussion
4. Conclusion
5. Acknowledgments

[1] Jie Hu Cui, Chun Guang Li, and Xiu Hong Du, J. Chem. Eng. Data, 56, 3149 (2011).

[2] Su W.Y., Wang S.M., Cheng S.H., J. Electroanal. Chem., 651, 166 (2011).

[3] Pumera M., Wang J., Grushka E. et al., Anal. Chem., 73, 5625 (2001).

[4] A. Kumar, A. Pamwar, Microchim. Acta, 111, 177 (1993).

[5] S.-P. Wang, T.-H. Huang, Anal. Chim. Acta, 534, 207 (2005).

[6] W.C. Yang, X.D. Yu, A.M. Yu, H.Y. Chen, J. Chromatogr. A, 910, 311 ( 2001).

[7] Delaguardia M.; Hasan B.A.; Moralesrubio A.; Arias J.J. Gar- ciafraga J.M.; Jimenez A.I.; Jemenez F.; Khalaf K.D., The Analyst, 121, 1321 (1996).

[8] Joseph Wang, Randhir P. Deo, Mustafa Musameh, Electroana- lysis, 15, 23 (2003).

[9] Cheng Yuxiao, Liu Yajun, Huang Jingjing, Li Kang, Xian Yu- ezhong, Zhang Wen, Jin Litong, Electrochim. Acta, 54, 2588 (2009).

[10] H. Lin, X. Ji, Q. Chen, Y. Zhou, C.E. Banks, K. Wu, Electro- chem. Commun., 11, 1990 (2009).

[11] Iijima S., Nature, 354, 56 (1991).

[12] Wu K.B., Wang H., Chen F. and Hu S.S., Bioelectrochem., 68, 144 (2006).

[13] Xiao Y, Ju H.X., Chen H.Y., Anal Chim. Acta, 391, 73 (1999). [14]Sun Xiulan , Zhao Xiaolian , Tang Jian, Chinese Journal of Wuxi University of Light Industry, 23, 86 (2004).

[15] C.G. Hu, Z.L. Chen, A.G. Shen, X.C. Shen, J. Li, S.S. Hu, Carbon, 44, 428 (2006).

[16] A.J. Bard, L.R. Faulkner, Electrochemical Methods Fundamen- tals and Applications, John Wiley&Sons. New York, 1980.

[17] Adams R.N., Electrochemistry at solid electrodes. New York, Marcel Dekker, 1969.

[18]B. Wang, X. Cao, J. Electroanal. Chem., 309, 147 (1991).