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<p>Degradation of pesticides (e.g., chlorpyrifos (CP)) and their metabolites is an area of evolving research. Palladium nanoparticles (Pd NPs) synthesis was achieved by microbial consortia from sludge to be used later as catalysts for the degradation of 3,5,6-trichloro-2-pyridinol (TCP), CP’s metabolite. Hydrogen (H<sub>2</sub>) and glucose were used as electron donors to reduce Pd(II) and synthesize Pd NPs. When both glucose and Pd NPs were present, TCP removal exceeded 90% but suggested the presence of potential intermediates, consistent with a stepwise dechlorination. In contrast, H₂ microcosms with Pd NPs achieved &gt; 95% TCP removal, but when lacking Pd NPs, microcosms supplemented only with H<sub>2</sub> showed marginal TCP degradation. <i>Azospira</i> and <i>Thauera</i> were dominant across all microcosms and could be dechlorinating TCP and producing Pd NPs. <i>Clostridium</i> dominated the microcosm with glucose and Pd, which pointed to its role in fermenting and generating H<sub>2</sub> to be later used for Pd NP production. Abiotic control microcosms showed Pd NPs synthesis with H<sub>2</sub> as an electron donor but not with glucose; therefore, microorganisms were needed for Pd NPs synthesis if glucose is provided. While several studies have focused on synthetic microbial consortia or single strain research for TCP microbial degradation, this research demonstrated the capacity of naturally occurring microbial consortia to degrade TCP with the aid of Pd NPs, which were also synthesized biologically.</p>

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Microbial communities produced palladium nanoparticles for the degradation of 3,5,6-trichloro-2-pyridinol, metabolite of the insecticide Chlorpyrifos

  • 期刊论文

  • 发表日期：

    2026年1月27日

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  • Aries Figueroa-Careaga,
  • Rene Rangel-Mendez,
  • Francisco J Cervantes,
  • Elias Razo-Flores,
  • Aura Ontiveros-Valencia

摘要

Degradation of pesticides (e.g., chlorpyrifos (CP)) and their metabolites is an area of evolving research. Palladium nanoparticles (Pd NPs) synthesis was achieved by microbial consortia from sludge to be used later as catalysts for the degradation of 3,5,6-trichloro-2-pyridinol (TCP), CP’s metabolite. Hydrogen (H2) and glucose were used as electron donors to reduce Pd(II) and synthesize Pd NPs. When both glucose and Pd NPs were present, TCP removal exceeded 90% but suggested the presence of potential intermediates, consistent with a stepwise dechlorination. In contrast, H₂ microcosms with Pd NPs achieved > 95% TCP removal, but when lacking Pd NPs, microcosms supplemented only with H2 showed marginal TCP degradation. Azospira and Thauera were dominant across all microcosms and could be dechlorinating TCP and producing Pd NPs. Clostridium dominated the microcosm with glucose and Pd, which pointed to its role in fermenting and generating H2 to be later used for Pd NP production. Abiotic control microcosms showed Pd NPs synthesis with H2 as an electron donor but not with glucose; therefore, microorganisms were needed for Pd NPs synthesis if glucose is provided. While several studies have focused on synthetic microbial consortia or single strain research for TCP microbial degradation, this research demonstrated the capacity of naturally occurring microbial consortia to degrade TCP with the aid of Pd NPs, which were also synthesized biologically.