Conducting polypyrrole (PPy) films with anthraquinonedisulfonate (AQDS) incorporated as dopants were prepared by electropolymerization of the pyrrole monomer in the presence of anthraquinone-2,6-disulfonic acid, disodium salt on a graphite electrode from aqueous solution. Cyclic voltammetry (CV), scanning electron microscope (SEM), and Fourier transfer infrared spectroscopy (FTIR) technologies were used to characterize the resulting AQDS/PPy composite film. The electrocatalytic activities of the bare graphite and the AQDS/PPy/graphite cathodes toward oxygen reduction and Fe 2+ regeneration were studied by using cyclic voltammetry and cathodic polarization technologies. In addition, the electron-Fenton degradation of amaranth azo dye was also studied with the potentiostatic electrolysis mode, using the bare graphite and the AQDS/PPy/graphite as cathode and Fe 3+ as catalyst. The results show that (i) H 2 O 2 generation and Fe 2+ regeneration mainly depend on the cathode materials utilized, (ii) solution pH, cathodic potential, and oxygen flow rate influence H 2 O 2 accumulation and current efficiency greatly, while the effect of AQDS doping concentration is insignificant, and (iii) Fe 3+ concentration influences the electro-Fenton oxidation ability and efficiency; the main oxidizing species is hydroxyl radical ( • OH) formed in the reaction solution from Fenton’s reagent electrogenerated concurrently at the cathode.
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Zhang et al. (2008) studied this question.
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