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Comparative analysis of Cr(VI) oxyanions adsorption on aged polyamide microplastics: Evaluating UV irradiation versus chemical aging
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Aging amplifies synergistic adsorption and reduction of Cr(VI) by polyamide microplastics
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UV and chemical aging of polyamide microplastics increased their oxygen-containing functional groups and significantly enhanced their capacity to both adsorb and chemically reduce toxic hexavalent chromium to the less harmful Cr(III) form in water. This shows that weathered microplastics in natural environments are more effective heavy metal scavengers than pristine particles, altering the fate and bioavailability of toxic metals in aquatic systems.
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Researchers found that UV and chemical aging of polyamide microplastics amplified their adsorption and reduction of hexavalent chromium Cr(VI), increasing oxygen-containing functional groups while reducing amide bonds, with Cr(VI) binding driven by electrostatic forces and hydrogen bonds and the aged microplastics able to reduce Cr(VI) to less toxic Cr(III) even under UV light and oxygen-depleted conditions.
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Researchers studied the correlation between aging properties and adsorption of hexavalent chromium Cr(VI) onto polyethylene microplastics under accelerated UV aging conditions, finding that aging-induced changes in surface chemistry increased the adsorption capacity. Aged microplastics may act as more effective vectors for toxic heavy metals in aquatic environments.
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