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<p>The prevalence of quinolone antibiotics as emerging contaminants in wastewater necessitates urgent remediation strategies due to their recalcitrant nature and ecological risks. This study demonstrates an innovative Ag-nZVI/BC composite synthesized through silver-modified nZVI immobilized on coconut shell biochar, which effectively activates H<sub>2</sub>O<sub>2</sub> for levofloxacin (LVF) degradation. The composite’s exceptional performance (91.2% LVF removal at 0.3 g/L dosage) stems from its 238 m<sup>2</sup>/g specific surface area and abundant oxygen-containing functionalities that facilitate electron transfer. Systematic parameter optimization revealed pH 3.0, 10 mmol/L H<sub>2</sub>O<sub>2</sub>, and 0.3 g/L catalyst as optimal conditions, while coexisting anions showed differential inhibition effects. Radical quenching experiments coupled with EPR spectroscopy confirmed ·OH and ·O<sub>2</sub><sup>−</sup> as dominant reactive species. Through LC-MS analysis, we identified three primary degradation pathways involving piperazine ring cleavage and defluorination. Notably, eco-toxicity assessment using ECOSAR indicated 62.7% reduction in acute aquatic toxicity after treatment. The regenerable catalyst maintained 83.4% efficiency after five cycles, demonstrating a sustainable approach for antibiotic-contaminated wastewater remediation.</p>

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Dual-functional Ag-Fe@Biochar systems: simultaneous adsorption and radical-mediated oxidation of antibiotics in fenton-like reactions

  • 期刊论文

  • 发表日期：

    2025年6月30日

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  • Chao Leng,
  • Shicong Luo,
  • Edwin Hena Dawolo,
  • Ning Ding,
  • Hong Liu

摘要

The prevalence of quinolone antibiotics as emerging contaminants in wastewater necessitates urgent remediation strategies due to their recalcitrant nature and ecological risks. This study demonstrates an innovative Ag-nZVI/BC composite synthesized through silver-modified nZVI immobilized on coconut shell biochar, which effectively activates H2O2 for levofloxacin (LVF) degradation. The composite’s exceptional performance (91.2% LVF removal at 0.3 g/L dosage) stems from its 238 m2/g specific surface area and abundant oxygen-containing functionalities that facilitate electron transfer. Systematic parameter optimization revealed pH 3.0, 10 mmol/L H2O2, and 0.3 g/L catalyst as optimal conditions, while coexisting anions showed differential inhibition effects. Radical quenching experiments coupled with EPR spectroscopy confirmed ·OH and ·O2− as dominant reactive species. Through LC-MS analysis, we identified three primary degradation pathways involving piperazine ring cleavage and defluorination. Notably, eco-toxicity assessment using ECOSAR indicated 62.7% reduction in acute aquatic toxicity after treatment. The regenerable catalyst maintained 83.4% efficiency after five cycles, demonstrating a sustainable approach for antibiotic-contaminated wastewater remediation.