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<p>Norfloxacin (NOR), a widely used fluoroquinolone antibiotic, raises environmental concerns due to its persistence and potential to promote bacterial resistance. To address this, sulfate-based advanced oxidation processes (SR-AOPs) have emerged as effective solutions, utilizing SO<sub>4</sub><sup>·−</sup> radicals for pollutant degradation. In this study, manganese dioxide nanoparticles (MnO<sub>2</sub>) were used to activate peroxymonosulfate (PMS), achieving a NOR degradation efficiency of 97.54% under optimized conditions (pH 3, 40&#xa0;°C). The MnO<sub>2</sub> catalyst demonstrated good reusability, making it suitable for practical water treatment applications. Mechanistic studies revealed that SO<sub>4</sub><sup>·−</sup> and ·OH played dominant roles in the degradation, with less involvement of O<sub>2</sub><sup>·–</sup>. A degradation pathway was proposed using HR-MS data, and toxicity assessments via ECOSAR software underscored the importance of evaluating both NOR metabolites and the parent compound to mitigate ecological risks.</p> Graphical Abstract <p></p>

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Hydrothermally Synthesized MnO2 Toward Efficient Sulfate Radical Based Catalytic Degradation of Norfloxacin

  • 期刊论文

  • 发表日期：

    2025年1月28日

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  • Madhu Kumari,
  • Shreya Dutta,
  • Saheli Bhowmik,
  • Parag Datta,
  • Mrudula Pulimi

摘要

Norfloxacin (NOR), a widely used fluoroquinolone antibiotic, raises environmental concerns due to its persistence and potential to promote bacterial resistance. To address this, sulfate-based advanced oxidation processes (SR-AOPs) have emerged as effective solutions, utilizing SO4·− radicals for pollutant degradation. In this study, manganese dioxide nanoparticles (MnO2) were used to activate peroxymonosulfate (PMS), achieving a NOR degradation efficiency of 97.54% under optimized conditions (pH 3, 40 °C). The MnO2 catalyst demonstrated good reusability, making it suitable for practical water treatment applications. Mechanistic studies revealed that SO4·− and ·OH played dominant roles in the degradation, with less involvement of O2·–. A degradation pathway was proposed using HR-MS data, and toxicity assessments via ECOSAR software underscored the importance of evaluating both NOR metabolites and the parent compound to mitigate ecological risks.

Graphical Abstract