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Investigation on the adsorption-desorption behavior of antibiotics by polybutylene succinate and polypropylene aged in different water conditions
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This study examined how aging of polybutylene succinate (PBS) and polypropylene (PP) microplastics under different water conditions—salinity and dissolved organic matter (DOM)—affects their adsorption and desorption of sulfamethoxazole antibiotic. DOM promoted aging more strongly than salinity for both polymers, and the degree of aging under combined conditions was lower than for single-factor exposures. Aging altered antibiotic binding capacity differently for PBS versus PP, with implications for antibiotic transport via microplastics in aquatic environments.
Abstract Microplastics (MPs) are widely present in the aqueous environment and aged by natural components, such as salinity (SI) and dissolved organic matter (DOM). The effects of multi-conditioned ageing on the physicochemical properties and environmental behavior of MPs are not completely investigated. In this study, the degradable MPs polybutylene succinate (PBS) was used to investigate the environmental behavior of sulfamethoxazole (SMZ), and compared it with polypropylene (PP). The results showed that the single conditions of DOM and SI, particularly DOM, promoted the ageing process of MPs more significantly, especially for PBS. The degree of MPs ageing under multiple conditions is lower than that of under single condition. Compared to PP, PBS has a greater specific surface area, crystallinity and hydrophilicity, so it has a stronger adsorption capacity for SMZ. The adsorption behavior of MPs fitted well with the pseudo-second-order kinetic and Freundlich isotherm models, indicating a multilayer adsorption. The desorption experiments showed that the desorption amount of SMZ on MPs in simulated intestinal fluid was greater than that in Milli-Q water. Both the original PBS and the aged PBS had a stronger desorption capacity than the PP. The desorption quantity of PBS was 1.23–1.84 times greater than PP, while the desorption rates were not significantly different. This experiment would provide a theoretical basis for assessing the ecological risks of degradable MPs in complex water conditions.
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Investigation of the adsorption–desorption behavior of antibiotics by polybutylene succinate and polypropylene aged in different water conditions
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Researchers investigated how dissolved organic matter and salinity affect the aging of polybutylene succinate (PBS) and polypropylene (PP) microplastics and their subsequent adsorption-desorption of the antibiotic sulfamethoxazole, finding that dissolved organic matter promoted aging more strongly than salinity, especially for the biodegradable PBS, and that aging altered antibiotic binding behavior.
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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.
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Researchers tested how UV aging of polyhydroxyalkanoate (PHA) and polyethylene (PE) microplastics affects their adsorption and desorption of the antibiotic sulfamethoxazole in simulated fish intestinal and mammalian stomach fluids. Aging increased adsorption capacity for sulfamethoxazole, while desorption in digestive fluids was higher for aged PHA than aged PE, with implications for antibiotic bioavailability in organisms that ingest microplastics.
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Researchers investigated how aging processes affect the ability of degradable and non-biodegradable microplastics to adsorb sulfonamide antibiotics in aquatic environments. The study found that aging increased the hydrophilicity and polarity of microplastics, boosting the adsorption capacity of polylactic acid by up to 3.18 times, suggesting that weathered microplastics may pose greater ecological risks as carriers of co-existing contaminants.
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