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<p>Humic acids (HA), the main fraction of natural organic matter, can degrade water quality and form harmful by-products during disinfection. This study evaluated manganese ferrite (MnFe₂O₄) and cobalt ferrite (CoFe₂O₄) as heterogeneous catalysts for HA removal by ozonation. Experiments at pH 6.0, 9.5, and 12.0 measured total organic carbon (TOC) and color reduction and assessed the role of hydroxyl radicals (•OH) via radical scavenger tests. Both catalysts markedly improved ozonation efficiency over the non-catalytic process, achieving maximum TOC removals of 79% (MnFe₂O₄) and 83% (CoFe₂O₄) at pH 9.5. Their amphoteric character ensured stable activity across the pH range, while scavenger experiments confirmed •OH as the main oxidizing species. Enhanced color removal, especially at VIS400, indicated significant structural transformation of HA. These findings highlight MnFe₂O₄ and CoFe₂O₄ as efficient, magnetically recoverable catalysts for advanced oxidation processes, offering a promising route for the degradation of recalcitrant organics in water treatment.</p>

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Humic acid degradation through catalytic ozonization process

  • 期刊论文

  • 发表日期：

    2025年10月29日

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  • Larielly Regina Santos Silva,
  • Marcos Vinícius Mateus,
  • Vinícius Carvalho Rocha,
  • Ariana de Campos,
  • Carla Eloisa Diniz dos Santos,
  • Cristiano Poleto,
  • Mauro Luiz Begnini,
  • Júlio Cesar de Souza Inácio Gonçalves,
  • Mário Sérgio da Luz

摘要

Humic acids (HA), the main fraction of natural organic matter, can degrade water quality and form harmful by-products during disinfection. This study evaluated manganese ferrite (MnFe₂O₄) and cobalt ferrite (CoFe₂O₄) as heterogeneous catalysts for HA removal by ozonation. Experiments at pH 6.0, 9.5, and 12.0 measured total organic carbon (TOC) and color reduction and assessed the role of hydroxyl radicals (•OH) via radical scavenger tests. Both catalysts markedly improved ozonation efficiency over the non-catalytic process, achieving maximum TOC removals of 79% (MnFe₂O₄) and 83% (CoFe₂O₄) at pH 9.5. Their amphoteric character ensured stable activity across the pH range, while scavenger experiments confirmed •OH as the main oxidizing species. Enhanced color removal, especially at VIS400, indicated significant structural transformation of HA. These findings highlight MnFe₂O₄ and CoFe₂O₄ as efficient, magnetically recoverable catalysts for advanced oxidation processes, offering a promising route for the degradation of recalcitrant organics in water treatment.