Recovery of manganese oxides from spent alkaline and zinc–carbon batteries. An application as catalysts for VOCs elimination

•Manganese oxides were synthesized using spent batteries as raw materials.•Spent alkaline and zinc–carbon size AA batteries were used.•A biohydrometallurgical process was employed to bio-lixiviate batteries.•Manganese oxides were active in the oxidation of VOCs (ethanol and heptane). Manganese, in t...

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