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<p>This study investigates the adsorption behavior of U-232 by polyamide nylon 6 (PN6) microplastics (MPs), prior and after humic acid (HA) coating. Varius factos such as contact time, temperature and pH, solution composition on the U-232 adsorption have been investigated. HA-coated MPs exhibited superior U-232 uptake, particularly in acidic and neutral solutions. In seawater the adsorption efficiency diminishes, around 20%, due to competition with naturally occurring ions and carbonate anions, which form stable U(VI) complexes in solution. These findings illuminate the nuanced role of HA-coating in shaping MPs’ environmental fate and properties as radionuclide carriers.</p> Graphical Abstract <p></p>

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Interaction of humic acids with PN6 microplastics and increased affinity for radionuclides (U-232)

  • 期刊论文

  • 发表日期：

    2025年6月17日

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  • Ioannis Ioannidis,
  • Eleni Antoniou,
  • Vasiliki Kinigopoulou,
  • Dimitrios A. Giannakoudakis,
  • Konstantinos S. Triantafyllidis,
  • Ioannis Anastopoulos,
  • Ioannis Pashalidis

摘要

This study investigates the adsorption behavior of U-232 by polyamide nylon 6 (PN6) microplastics (MPs), prior and after humic acid (HA) coating. Varius factos such as contact time, temperature and pH, solution composition on the U-232 adsorption have been investigated. HA-coated MPs exhibited superior U-232 uptake, particularly in acidic and neutral solutions. In seawater the adsorption efficiency diminishes, around 20%, due to competition with naturally occurring ions and carbonate anions, which form stable U(VI) complexes in solution. These findings illuminate the nuanced role of HA-coating in shaping MPs’ environmental fate and properties as radionuclide carriers.

Graphical Abstract