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<p>Conventional waste water treatment facilities lack the appropriate design to abate the presence of antibiotics, which are potential hazards in natural water sources. The use of electroactive bacteria and biochar to eliminate antibiotics has been reported; however, the impact and underlying mechanisms by which biochar enhances the biodegradation of antibiotics by electroactive microorganisms remain unclear. As chloramphenicol exhibits a high degree of toxicity to aquatic organisms, this study investigated the synergistic effect of biochar on the biodegradation of chloramphenicol by electroactive <i>Shewanella oneidensis</i> MR-1. Biochar significantly improved chloramphenicol degradation rates from 36.05% to 70.79% within 24 h by promoting electron transfer processes in <i>S. oneidensis</i> MR-1, a typical electroactive microorganism. This study offers unique insights into the electrochemical properties of biochar, particularly those influenced by pyrolysis temperature, in enhancing the microbial electron transfer processes. Furthermore, the findings demonstrated that biochar not only promotes the growth and activity of electroactive bacteria but also facilitates direct and indirect electron transfer mechanisms, leading to significantly improved antibiotic degradation rates. In summary, biochar is a novel perspective in environmental biotechnology that offers an innovative approach to address the challenge of persistent antibiotics in wastewater treatment.</p>

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Biochar-enhanced chloramphenicol degradation via electron transfer in electroactive microorganisms

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • Kaimin Yang,
  • Peng Li,
  • Ping Chen,
  • Yen Wah Tong,
  • Dong Zhang,
  • Yiliang He

摘要

Conventional waste water treatment facilities lack the appropriate design to abate the presence of antibiotics, which are potential hazards in natural water sources. The use of electroactive bacteria and biochar to eliminate antibiotics has been reported; however, the impact and underlying mechanisms by which biochar enhances the biodegradation of antibiotics by electroactive microorganisms remain unclear. As chloramphenicol exhibits a high degree of toxicity to aquatic organisms, this study investigated the synergistic effect of biochar on the biodegradation of chloramphenicol by electroactive Shewanella oneidensis MR-1. Biochar significantly improved chloramphenicol degradation rates from 36.05% to 70.79% within 24 h by promoting electron transfer processes in S. oneidensis MR-1, a typical electroactive microorganism. This study offers unique insights into the electrochemical properties of biochar, particularly those influenced by pyrolysis temperature, in enhancing the microbial electron transfer processes. Furthermore, the findings demonstrated that biochar not only promotes the growth and activity of electroactive bacteria but also facilitates direct and indirect electron transfer mechanisms, leading to significantly improved antibiotic degradation rates. In summary, biochar is a novel perspective in environmental biotechnology that offers an innovative approach to address the challenge of persistent antibiotics in wastewater treatment.