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<p>Antimony contamination in mining-impacted river basins poses persistent environmental risks, yet the microbial processes governing antimony redox transformation under anoxic sediments remain poorly understood. Here, we report that photoelectrons generated by naturally occurring dissolved organic matter can support microbial antimonate reduction. Natural dissolved organic matter exhibits sustained photocurrent responses under illumination. In anoxic microcosms, indigenous sediment communities achieve 50–70% antimonate reduction with photoelectron supply, thereby constraining purely abiotic reduction or alternative electron-donor explanations under our experimental conditions. Multi-omics further identify non-phototrophic taxa (e.g., <i>Sphingomonas</i> and <i>Bosea</i>) with elevated antimony reduction/detoxification pathways and respiratory electron-transfer components under photoelectron exposure. The consistent presence of photosensitive dissolved organic matter and candidate taxa across mining-impacted sediments suggests broader environmental relevance. These findings indicate that photosensitive dissolved organic matter may provide a photoelectron flux that influences microbial antimony redox transformations in anoxic sediments.</p>

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Dissolved organic matter-generated photoelectrons enable microbial antimonate reduction in mine stream sediments

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月20日

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  • Linao Zhu,
  • Hanbing Gao,
  • Min Shen,
  • Kuanxin Huang,
  • Yongqun Tang,
  • Lele He,
  • Jing Huang,
  • Cheng Zhao,
  • Weiping Xiong,
  • Xiaoli Ni,
  • Honghui Wu,
  • Shikai Li,
  • Zhaohui Guo,
  • Jie Cao,
  • Wenjing Xue,
  • Rui Xu

摘要

Antimony contamination in mining-impacted river basins poses persistent environmental risks, yet the microbial processes governing antimony redox transformation under anoxic sediments remain poorly understood. Here, we report that photoelectrons generated by naturally occurring dissolved organic matter can support microbial antimonate reduction. Natural dissolved organic matter exhibits sustained photocurrent responses under illumination. In anoxic microcosms, indigenous sediment communities achieve 50–70% antimonate reduction with photoelectron supply, thereby constraining purely abiotic reduction or alternative electron-donor explanations under our experimental conditions. Multi-omics further identify non-phototrophic taxa (e.g., Sphingomonas and Bosea) with elevated antimony reduction/detoxification pathways and respiratory electron-transfer components under photoelectron exposure. The consistent presence of photosensitive dissolved organic matter and candidate taxa across mining-impacted sediments suggests broader environmental relevance. These findings indicate that photosensitive dissolved organic matter may provide a photoelectron flux that influences microbial antimony redox transformations in anoxic sediments.