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Cr(III) - Cr(VI): variability of the speciation of chromium released into the environment by microplastic weathering
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Researchers examined how the weathering of microplastics releases chromium into the environment, with particular attention to the speciation shift between the less toxic Cr(III) and the highly toxic, carcinogenic Cr(VI) forms.
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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.
The photo-redox of chromium regulated by microplastics (MPs) and MPs-derived dissolved organic matter (MPs-DOM) and the CO2 emission of MPs-DOM
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Researchers found that microplastics and their derived dissolved organic matter regulate the photo-redox transformation of chromium in wastewater, with UV exposure converting less toxic Cr(III) to more hazardous Cr(VI) while microplastic-derived organic matter influences this process and contributes to CO2 emissions.
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Polyamide microplastics as better environmental vectors of Cr(VI) in comparison to polyethylene and polypropylene microplastics
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Researchers found that polyamide microplastics adsorb more hexavalent chromium (Cr(VI)) than polyethylene or polystyrene microplastics, with UV aging increasing adsorption capacity, making polyamide particles potentially more dangerous environmental vectors for this toxic heavy metal.
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Researchers studied how UV aging affects the adsorption of hexavalent chromium onto PE, PS, and PA microplastics, finding that aged microplastics had significantly enhanced adsorption capacity due to increased surface area and functional group changes from weathering.
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