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Adsorption behavior of Cu(II) and Cr(VI) on aged microplastics in antibiotics-heavy metals coexisting system
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Researchers investigated how antibiotics affect the adsorption of copper and chromium onto aged polystyrene and PVC microplastics, finding that antibiotic co-contamination alters heavy metal binding behavior on weathered plastics in aqueous environments.
Recently, the microplastics, as well as the compound pollution of heavy metals and antibiotics, in the aqueous environment have attracted increasing attention, but studies on the behavior of heavy metals on aged microplastics in antibiotics-heavy metals coexisting system are limited. Herein, to explore the impact of antibiotics on the adsorption of heavy metals by aged microplastics, the adsorption behavior of Cu(II) and Cr(VI) on aged polystyrene (PS) and polyvinyl chloride (PVC) were investigated. The results presented that ciprofloxacin (CIP) had negative and positive impacts on the adsorption of Cu(II) and Cr(VI) by aged microplastics, respectively. Moreover, the existence of CIP seemed to have no evident effect on the type of adsorption isotherm model and kinetic model in most adsorption systems of Cu(II). The negative impact of CIP on adsorption of Cu(II) may result from the competition adsorption and high steric hindrance effect, while non-specific interactions between neutral antibiotic-heavy metal complexes and the hydrophobic surface of aged microplastics as well as CIP as bridges influenced positively on adsorption of Cr(VI) on aged microplastics. This work was concerned with the interaction between binary pollutants and aging microplastics to clarify the risks of microplastics in the aqueous environment.
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Researchers studied how heavy metals in water affect the ability of polyethylene microplastics to absorb the antibiotic ciprofloxacin. They found that heavy metals competed with the antibiotic for binding sites on the microplastic surface, changing how much of each pollutant the plastic could carry. This is important because it shows microplastics in real-world environments may transport different combinations of pollutants, potentially delivering both antibiotics and heavy metals into the food chain.
[Sorption Behaviors of Copper Ions and Tetracycline on Microplastics in Aqueous Solution].
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Researchers studied the simultaneous sorption of copper ions and tetracycline antibiotic onto different microplastics in water, finding complex competitive and synergistic interactions. The study illuminates how microplastics can facilitate combined heavy metal and antibiotic contamination in aquatic environments.
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Researchers studied how aged polybutylene terephthalate microplastics interact with cadmium and the antibiotic tetracycline in water, finding that weathered microplastics adsorb these pollutants more readily than pristine ones. The study suggests that aging changes the surface properties of microplastics, increasing their capacity to carry heavy metals and antibiotics and potentially amplifying their environmental toxicity.
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