Electrodeposition of electrolytic manganese dioxide on carbon substrates from leachates from exhausted alkaline batteries

. In the alkaline batteries of Zn/MnO2, the electrolytic manganese dioxide (EMD) is used as cathode and constitutes a very important part of household waste which contributes with heavy metals to the solid urban waste. This study describes the recovery of EMD by electro-oxidation on carbon cloth in acidic leached liquors from used alkaline batteries. The maximum extraction yield for Mn and Zn were 43.68% (0.744 molL-1) and 56.11% (0.7321 molL-1) respectively. The voltammograms of a vitreous carbon electrode for EMD deposition from leached liquors were obtained between 0.0 and 1.4V vs ECS, and exhibit an anodic peak at 1.2V vs ECS. In addition, a cathodic peak appears at 0.97V vs ECS. The x-ray diffraction reveals the presence of nsutite (γ-MnO2) and manganite (γ - MnOOH) for all deposits, and the morphology of the deposits was observed by SEM.

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