Voltammetric Response of Furazolidone on Multi-walled Nanotube Film Coated Carbon Paste Electrode Using Ionic Liquid

A film of multiwalled carbon nanotubes (MWCNT) was casted on the surface of an ionic liquid (IL) modified carbon paste electrode (CPE) to established a modified electrode denoted as MWCNT/IL/CPE. The electrochemical reduction of furazolidone (Fu) was investigated with cyclic voltammetry. The constructed electrode (MWCNT/IL/CPE) exhibited excellent electrocatalytic behavior toward the reduction of Fu as evidenced by the enhancement of the reduction peak current and the shift in the cathodic potential to less negative values (by 20 mV) in comparison with the bare CPE. The formal potential, E0ʹ, of Fu is pH dependent with a slope of -53.1 mV per unit of pH, close to the anticipated Nernestian value of -59 mV for a 4-electron and 4-proton process. A detailed analysis of cyclic voltammograms gave fundamental electrochemical parameters including the electroactive surface coverage (?), the transfer coefficient (?) and the standard rate constant (ks). A linear calibration curve was obtained for Fu detection in the concentration range of 50-800 ?mol L-1 of detection limit 33 ?mol L-1.