Electrodeposition of lead dioxide on Fe electrode: application to the degradation of Indigo Carmine dye

The modification of an iron electrode was carried out according to the following two steps. In a first step, a cathodic reduction is performed to form a film of metallic lead on a bare iron electrode, in 5 mol m(-3) + 50 mol M-3 KNO3 solution, at -0.8 V/SCE during 300 s. In a second step, the film of metallic lead is converted to PbO2 in 100 mol m(-3) NaOH solution, at +0.7 V/SCE during 150 s. EDX, X-ray diffraction and scanning electron microscopy analysis, confirm that Pb metal and alpha-PbO2 are successfully deposited. The electrocatalytic activity of the resulting oxide is assessed for the indigo-carmine (IC) dye degradation reaction, using potentiostatic method. The IC dye was successfully oxidized by hydroxyl radical electrogenerated from oxidation of water on the Fe/Pb/alpha-PbO2 electrode. These results suggest that Fe/Pb/alpha-PbO2 electrode is a promising candidate for electrocatalytic degradation of IC wastewater. [GRAPHICS] .