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<p>In this study, the in-situ synthesis of birnessite successfully removed Co<sup>2+</sup> from simulated radioactive wastewater. The optimal reaction conditions were determined by single-factor experiments: a reaction time of 60&#xa0;min, a pH of 11, a reaction temperature of 50°C and a Mn<sup>2+</sup>/Co<sup>2+</sup> molar ratio of 7:1. The removal rate of Co<sup>2+</sup> reached 99.97%. XRD confirmed birnessite as the precipitate. FTIR, precipitate&#xa0;dissolution and XPS analyses indicated that the removal mechanisms of Co<sup>2+</sup> included hydroxide precipitation (0.36%), adsorption (4.70%) and ion exchange (94.94%). In conclusion, the in-situ synthesis of birnessite for Co<sup>2+</sup> removal is promising for the treatment of radioactive wastewater.</p>

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In-situ synthesis process of birnessite to remove Co2+ from the simulated radioactive wastewater

  • 期刊论文

  • 发表日期：

    2025年2月6日

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  • Lanfang Hua,
  • Yingying Zhan,
  • Huiqi Fan,
  • Jie Fang,
  • Guangtuan Huang

摘要

In this study, the in-situ synthesis of birnessite successfully removed Co2+ from simulated radioactive wastewater. The optimal reaction conditions were determined by single-factor experiments: a reaction time of 60 min, a pH of 11, a reaction temperature of 50°C and a Mn2+/Co2+ molar ratio of 7:1. The removal rate of Co2+ reached 99.97%. XRD confirmed birnessite as the precipitate. FTIR, precipitate dissolution and XPS analyses indicated that the removal mechanisms of Co2+ included hydroxide precipitation (0.36%), adsorption (4.70%) and ion exchange (94.94%). In conclusion, the in-situ synthesis of birnessite for Co2+ removal is promising for the treatment of radioactive wastewater.