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<p>This study focuses on the first stage of a two-stage process for selective metal removal, specifically targeting manganese (Mn) from an aqueous solution containing manganese (Mn), cobalt (Co), and zinc (Zn) ions using ozone (O₃) as an oxidant. Three ozone recirculation configurations were evaluated in a batch reactor to optimize manganese removal while preventing cobalt and zinc precipitation by maintaining an acidic pH. Results indicated that ozone significantly enhanced manganese removal, with the third configuration achieving about approximately 100% removal compared to 64% and 77% for configurations 1 and 2, respectively. X-ray diffraction analysis showed that the manganese oxide precipitate initially had low crystallinity but converted to crystalline Mn₃O₄ after thermal treatment at 650&#xa0;°C. This study highlights the effectiveness of ozone recycling in improving manganese removal and reducing ozone consumption in aqueous solutions with cobalt and zinc ions.</p> Graphical abstract <p>Proposed manganese recovery process via ozonation.</p> <p></p>

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Selective removal of Mn2+ ions from solutions containing Mn2+, Co2+, and Zn2+ ions using ozone

  • 期刊论文

  • 发表日期：

    2024年12月31日

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  • Diana Alejo-Guerra,
  • Alejandro López-Valdivieso,
  • Aurora Robledo-Cabrera

摘要

This study focuses on the first stage of a two-stage process for selective metal removal, specifically targeting manganese (Mn) from an aqueous solution containing manganese (Mn), cobalt (Co), and zinc (Zn) ions using ozone (O₃) as an oxidant. Three ozone recirculation configurations were evaluated in a batch reactor to optimize manganese removal while preventing cobalt and zinc precipitation by maintaining an acidic pH. Results indicated that ozone significantly enhanced manganese removal, with the third configuration achieving about approximately 100% removal compared to 64% and 77% for configurations 1 and 2, respectively. X-ray diffraction analysis showed that the manganese oxide precipitate initially had low crystallinity but converted to crystalline Mn₃O₄ after thermal treatment at 650 °C. This study highlights the effectiveness of ozone recycling in improving manganese removal and reducing ozone consumption in aqueous solutions with cobalt and zinc ions.

Graphical abstract

Proposed manganese recovery process via ozonation.