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<p>The valorization of chlorinated organic pollutants in water, such as 1,2-dichloroethane (1,2-DCA), into value-added products, such as ethylene, offers a sustainable remediation strategy but is limited by low efficiency and selectivity. Here we present a bioinspired system, consisting of cobalamin (vitamin B<sub>12</sub>) cofactor and microscale zero-valent iron (mZVI), that dechlorinates 1,2-DCA to ethylene with a rate constant of 0.066 h<sup>−1</sup> and near-100% selectivity. mZVI creates a moderately reducing environment that reduces cob(III)alamin (the original B<sub>12</sub> species) to cob(II)alamin, which forms an organocobalt–1,2-DCA complex and drives proton-independent dihaloelimination, avoiding unwanted hydrogenation and ethylene over-reduction. The strategy is effective for various chlorinated alkanes, alkenes and aromatics, high concentrations of 1,2-DCA in wastewater and mixed pollutants in groundwater. Mechanochemically anchoring B<sub>12</sub> onto mZVI enables assembly in a column reactor for continuous 1,2-DCA removal, achieving a more than tenfold reduction in costs compared with conventional redox processes. This work demonstrates a cost-effective approach to pollutant remediation and resource recovery through the rational modulation of B<sub>12</sub> redox chemistry.</p>

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Efficient and selective dechlorination of chlorinated organic pollutants by cob(II)alamin and zero-valent iron

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • Huaqing Wang,
  • Cheng Cheng,
  • Bo Zhao,
  • Banghai Liu,
  • Zhenyu Cao,
  • Shichao Cai,
  • Minda Yu,
  • Ying Zhao,
  • Baohua Gu,
  • Zhenyu Wang,
  • Beidou Xi,
  • Feng He

摘要

The valorization of chlorinated organic pollutants in water, such as 1,2-dichloroethane (1,2-DCA), into value-added products, such as ethylene, offers a sustainable remediation strategy but is limited by low efficiency and selectivity. Here we present a bioinspired system, consisting of cobalamin (vitamin B12) cofactor and microscale zero-valent iron (mZVI), that dechlorinates 1,2-DCA to ethylene with a rate constant of 0.066 h−1 and near-100% selectivity. mZVI creates a moderately reducing environment that reduces cob(III)alamin (the original B12 species) to cob(II)alamin, which forms an organocobalt–1,2-DCA complex and drives proton-independent dihaloelimination, avoiding unwanted hydrogenation and ethylene over-reduction. The strategy is effective for various chlorinated alkanes, alkenes and aromatics, high concentrations of 1,2-DCA in wastewater and mixed pollutants in groundwater. Mechanochemically anchoring B12 onto mZVI enables assembly in a column reactor for continuous 1,2-DCA removal, achieving a more than tenfold reduction in costs compared with conventional redox processes. This work demonstrates a cost-effective approach to pollutant remediation and resource recovery through the rational modulation of B12 redox chemistry.