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Citation: SUN Yu-Qin, YOU Wei, GAO Zuo-Ning. Electrocatalytic Oxidation of Pseudoephedrine Hydrochloride at Multi-wall Carbon Nanotube Modified Glassy Carbon Electrode and Its Electrochemical Kinetics[J]. Chinese Journal of Applied Chemistry, ;2008, 25(1): 58-62. shu

Electrocatalytic Oxidation of Pseudoephedrine Hydrochloride at Multi-wall Carbon Nanotube Modified Glassy Carbon Electrode and Its Electrochemical Kinetics

1.
Key Lab of Energy Resources and Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021

Corresponding author: GAO Zuo-Ning,
Received Date: 4 February 2007
Available Online: 30 June 2007
Fund Project: 宁夏高等学校科学研究基金(200623) (200623)宁夏大学自然科学基金(ZR0641)项目资助 (ZR0641)

Electrochemical behavior of pseudoephedrine hydrochloride(PSE) on multi-wall carbon nanotube modified glassy carbon electrode(MWCNT/GCE) was investigated by cyclic voltammetry(CV).The experimental results showed that the direct electrochemical oxidation of PSE was sluggish on GCE,with no oxidation peaks appearing,indicating that PSE has a high overpotential and can not be directly oxidized.However,on MWCNT/GCE,its oxidation current increased with the potential shifting positive,and an irreversible oxidation peak appeared at 0.902 V,which indicated that MWCNT/GCE can catalyze the electrochemical oxidation of PSE very well.The influence of experimental conditions on the electrochemical behavior of PSE was also studied.No oxidation peaks appeared for PSE at pH<7.0;whereas at pH>7.0,an anodic oxidation peak appeared,which was a diffusion-limited electrode reaction process;at the same time the diffusion coefficient D,electron transfer coefficient α,and the electrode reaction rate constant kf were determined to be 3.10×10^-6 cm²/s,0.94,and 1.48×10^-3/s,respectively.The experimental results of the amperometric response to time showed that current signal of the MWCNT/GCE was proportional to the PSE concentration,and the response time was less than 5 seconds,and the response concentration limit was 1×10^-5 mol/L.The method can be used in PSE electrochemical quantitative determination with low detection limit and high sensitivity.
- pseudoephedrine hydrochloride,
- carbon nanotubes modified glassy carbon electrode,
- electro-catalytic oxidation,
- electrochemical kinetics
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