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Interaction of humic acids with PN6 microplastics and increased affinity for radionuclides (U-232)
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Researchers found that coating polyamide nylon 6 microplastics with humic acid significantly increased their ability to adsorb the radioactive isotope uranium-232, particularly in acidic and neutral water, though adsorption dropped in seawater due to competing ions. This reveals that microplastics in humic-rich freshwater environments can become carriers for radionuclides, adding a nuclear contamination dimension to the already complex hazards of plastic pollution.
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.
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