Electrocatalytic Oxidation of Troxerutin Using Single-walled Carbon Nanotubes with Carboxyl Modified Glassy Carbon Electrode

KeyWord:SWCNTs-COOH  chemically modified electrode  troxerutin  cyclic voltammetry£¨CV£©  electrocatalytic oxidation

Abstract:

      The single-walled carbon nanotubes with carboxyl modified glassy carbon electrode£¨SWCNTs-COOH/GCE£© was prepared.The prepared electrode films were characterized by scanning electron microscopy£¨SEM£© and electrochemical impedance spectroscopy£¨EIS£© method.The SEM results showed that SWCNTs-COOH/GCE electrode was coated with a film of nano structure of intricate network through homogeneous distribution of SWCNTs-COOH in anhydrous ethyl alcohol solution.The EIS results showed that SWCNTs-COOH/GCE electrode had a good electrocatalytic response to the electron transfer of £ÛFe£¨CN£©6£Ý3-/4-.The electrochemical behavior of troxerutin was studied by cyclic voltammetry£¨CV£©.The result indicated that the SWCNTs-COOH/GCE electrode exhibited a remarkable catalytic and enhanced effect on the current response of troxerutin.The electrode reaction was a process of one-electron and one-proton transfer,and its oxidation mechanization may attribute to the oxidation of phenolic hydroxyl from troxerutin to carboxyl based on the product of constant electrolyte-voltage oxidation of troxerutin.The diffusion coefficient£¨D£© was 1.10¡Á10-6 cm2?s-1 and the rate constant£¨k£© was 9.87¡Á10-3 mol?L-1?s-1.Under the optimum condition,the response of the peak£¨E=0.85 V£© was proportional to the troxerutin concentration in the range of 8.04¡Á10-7-6.41¡Á10-4 mol?L-1 with a detection limit of 5.01¡Á10-7 mol?L-1.The RSDs£¨n=10£© of troxerutin were 3.1%.The method was applied in the determination of troxerutin in real sample with satisfactory result.