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Enhanced copper adsorption by polyamide and polylactic acid microplastics: The role of biofilm development and chemical aging
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Researchers studied how chemical aging and biofilm growth on polyamide and polylactic acid microplastics changed their ability to absorb copper from water. Both processes significantly increased the surface area and chemical reactivity of the plastics, making them absorb substantially more copper than fresh microplastics. The study suggests that as microplastics age and develop biofilms in natural waterways, they become increasingly effective at concentrating heavy metals, potentially altering how these contaminants move through aquatic environments.
Plastics undergo a range of physical, chemical, and biological changes in natural aquatic environments, which profoundly affect their environmental fate and bioavailability. This study investigates the effects of potassium persulfate (KSO) oxidation and biofilm attachment on the surface p'roperties and Cu(II) adsorption behavior of polyamide (PA) and polylactic acid (PLA) microplastics. Both chemical aging and biofilm formation significantly increase the specific surface area, crystallinity, and oxygen-containing functional groups of these microplastics. Specifically, the specific surface area of KSO-aged PA and PLA microplastics increased to 3.546 m g and 2.930 m g, respectively. 16S rDNA analysis revealed distinct bacterial communities on PA and PLA-MPs, reflecting different microbial attachment due to polymer types. Compared to pristine microplastics, KSO-aged PA and biofilm-covered PA had Cu(II) adsorption capacities of 1.536 mg g and 0.946 mg g, respectively, while KSO-aged PLA and biofilm-covered PLA capacities increased to 1.163 mg g and 0.812 mg g. Cu(II) adsorption onto aged microplastics followed the Freundlich model, indicating a multilayer adsorption mechanism. The pH significantly impacted Cu(II) adsorption efficiency, with the best performance observed under near-neutral conditions. Fulvic acid inhibited Cu(II) adsorption by competing for adsorption sites and forming complexes with Cu(II). These findings highlight the transformation mechanisms of microplastics within natural settings and their potential as heavy metal carriers, providing vital insights for assessing the environmental impact of microplastic pollution.
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Adsorption properties and mechanism of Cu(II) on virgin and aged microplastics in the aquatic environment
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Researchers examined how UV aging changes the surface properties of polyamide and polylactic acid microplastics and affects their ability to adsorb copper ions in water. The study found that UV irradiation altered the physical and chemical characteristics of both plastic types, increasing their capacity to bind heavy metals. Evidence indicates that weathered microplastics may act as more effective carriers of heavy metal contaminants in aquatic environments compared to virgin plastics.
Biofilm colonization on non-degradable and degradable microplastics change the adsorption of Cu(II) and facilitate the dominance of pathogenic microbes
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Researchers studied how biofilm growth on both degradable and non-degradable microplastics alters their ability to absorb copper from water. They found that aging and biofilm colonization significantly increased the adsorption capacity of both polyamide and polylactic acid microplastics for copper ions. The study also revealed that biofilm-covered microplastics harbored a higher proportion of potentially pathogenic microbes, raising concerns about microplastics as vectors for both heavy metals and harmful bacteria.
Adsorption properties and mechanism of Cu(Ⅱ) on virgin and aged microplastics in the aquatic environment
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This study examined how UV aging of polyamide (PA) and polylactic acid (PLA) microplastics affects their ability to adsorb copper (Cu II) from water. UV aging increased surface area and altered surface chemistry, making aged microplastics better carriers of copper contamination — raising concerns that weathered plastics in the environment may concentrate and transport heavy metals more effectively than fresh plastics.
Insights into adsorption behavior and mechanism of Cu(II) onto biodegradable and conventional microplastics: Effect of aging process and environmental factors
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Researchers compared how biodegradable and conventional microplastics adsorb copper ions from water, examining how aging processes and environmental factors influence this interaction. The study found that aged microplastics had a greater capacity to bind copper than fresh ones, suggesting that weathered plastic debris in the environment may serve as carriers for heavy metal contaminants.
Adsorption behavior of Cu(II) on UV-aged polyethylene terephthalate and polypropylene microplastics in aqueous solution
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Researchers studied how UV aging changes the ability of PET and polypropylene microplastics to adsorb copper ions from water. UV exposure altered the surface properties of both plastics, increasing their capacity to bind heavy metals compared to pristine particles. The findings suggest that weathered microplastics in the environment may be more effective at concentrating toxic metals, potentially increasing ecological risks in contaminated waterways.
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