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: 
Weihh1016@163.com
Page: 
73-77
|
DOI: 
https://doi.org/10.14447/jnmes.v16i2.11
Received: 
18 September 2012
|
Accepted: 
29 November 2012
|
Published: 
14 February 2013
| Citation
Abstract: 

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.

Keywords: 

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

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