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Aging-mediated selective adsorption of antibiotics by tire wear particles: Hydrophobic and electrostatic interactions effects
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Tire wear particles (a major form of microplastic pollution on roads) become more porous and adsorptive after aging through freeze-thaw cycles or ozone exposure, increasing their capacity to carry certain antibiotics by up to 28-fold for fluoroquinolones. However, the same aging process reduces adsorption of sulfonamide and tetracycline antibiotics, reflecting how the chemistry of both the particle and the antibiotic interact. This shows that weathered tire particles on roadways and in waterways can act as vehicles for antibiotic transport, with implications for antibiotic resistance spread in the environment.
Tire wear particles (TWPs), as a prevalent form of microplastic pollution in aquatic environments, have been shown to adsorb antibiotics, potentially exacerbating their toxic effects. This study provides a comprehensive analysis of the adsorption of ofloxacin (OFL), ciprofloxacin (CIP), sulfadiazine (SDZ), and tetracycline (TC) on TWPs that have undergone various aging processes, including cyclic freeze-thaw and ozone aging. We observed a significant increase in the specific surface area (SBET) of TWPs after aging, from an initial 2.81 ± 0.29 to 6.63 ± 0.16 m/g for ozone-aged TWPs. This enhancement in surface area and pore volume led to a respective 1.36-fold and 28-fold increase in adsorption capacity for OFL and CIP, highlighting the substantial impact of aging on TWPs' adsorptive properties. Conversely, the adsorption of SDZ and TC was reduced post-aging, suggesting a complex interaction between antibiotic physicochemical properties and TWPs' surface characteristics. The pseudo-second-order model, indicating chemisorption interactions, effectively described the adsorption kinetics, with the Freundlich isotherm model capturing the adsorption behavior more accurately than the Langmuir model. Our findings underscore the critical role of hydrophobic and electrostatic interactions in the adsorption process, particularly for SDZ and TC. This study's results offer crucial insights into the environmental implications of TWPs, emphasizing the need for further research on their role in the transport and fate of antibiotics in aquatic ecosystems.
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Aging, characterization and sorption behavior evaluation of tire wear particles for tetracycline in aquatic environment
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Researchers aged tire wear particles using UV weathering and chemical oxidation and studied how aging affects their sorption of tetracycline antibiotics, finding that weathering significantly alters surface chemistry and increases the capacity of tire particles to adsorb and potentially transport pharmaceutical contaminants.
Adsorption and desorption behaviors of antibiotics by tire wear particles and polyethylene microplastics with or without aging processes
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A comparison of antibiotic adsorption on tire wear particles (TWP) versus polyethylene microplastics found that UV-aged TWP had greater surface area increase and stronger adsorption of chlortetracycline and amoxicillin than aged PE, due to differences in surface chemistry and degradation susceptibility.
[Adsorption and Desorption Behaviors of Antibiotics on TWP and PVC Particles Before and After Aging].
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Researchers compared how tire wear particles and conventional PVC microplastics adsorb and release two antibiotics, finding tire wear particles behaved differently due to their complex composition. Aging of both particle types altered their adsorption capacity, with implications for how microplastics and tire particles spread antibiotic contamination in aquatic environments.
Sorption of antibiotics onto aged microplastics in freshwater and seawater
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Aged microplastics were found to sorb antibiotics from fresh and saltwater, with aging processes altering the surface properties of the plastic and increasing antibiotic binding capacity in some cases. The adsorption of antibiotics onto aged microplastics could facilitate their transport and delivery to aquatic organisms, potentially contributing to antibiotic resistance in environmental bacteria.
New insights into adsorption mechanism of pristine and weathered polyamide microplastics towards hydrophilic organic compounds
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Adsorption of four hydrophilic organic compounds including antibiotics sulfamethoxazole and ciprofloxacin onto pristine and weathered polyamide microplastics was studied, finding that weathering introduced oxygen-containing surface groups that significantly altered adsorption capacity and mechanisms. The results improve predictions of how microplastics transport co-occurring pollutants in aquatic environments.
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