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Color-Dependent Adsorption Behavior of Tetracycline onto Aged Microplastics
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Scientists found that microplastics of different colors absorb the antibiotic tetracycline differently, and this changes after the plastic breaks down in the environment (weathers or "ages"). This matters because microplastics can carry antibiotics into water, soil, and eventually our food, and color may affect how much they carry and release.
Microplastics have become a significant problem threatening both ecological systems and human health. This study focuses on four colors (red, yellow, blue, and green) of polypropylene (PP) and polymethyl methacrylate (PMMA), and the impact of color differences before and after aging on their environmental behavior. The findings indicate that color is a key factor influencing the aging behavior of microplastics. The red PP surface develops dense wrinkles, while the blue PP exhibits irregular flaking. After aging, the average particle size of PP decreases by 6-30%, with red and yellow PP particles showing even greater reductions. Adsorption studies reveal that microplastics display color-dependent patterns in their adsorption behavior toward tetracycline hydrochloride (TC-HCl). For virgin microplastics, the adsorption capacity order is red > blue > yellow ≈ green. After aging, this order shifts to red > yellow ≈ green > blue, with yellow and green microplastics showing significant improvements in adsorption performance. Both pH and ionic strength influence the adsorption behavior of colored microplastics. The adsorption of TC-HCl by virgin PP reaches its maximum at pH 9, whereas aged PP achieves maximum adsorption at pH 7. For PMMA, maximum adsorption capacity before and after aging occur at pH 5. Low concentrations of NaCl enhance adsorption capacity, but adsorption decreases as NaCl concentration increases. This study provides a theoretical basis for assessing the ecological risks posed by different colored microplastics in complex pollution scenarios.
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[Effect of Aging on Adsorption of Tetracycline by Microplastics and the Mechanisms].
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Researchers aged polyethylene and polystyrene microplastics under UV-254 irradiation and analyzed changes in color, surface morphology, and functional groups, finding that UV aging altered the physical and chemical properties of both MPs and significantly affected their adsorption capacity and mechanism for the antibiotic tetracycline.
Impact of sequential UV-aging of microplastics on the fate of antibiotic (tetracycline) in riverine, estuarine, and marine systems
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Researchers studied how sequential UV aging of polystyrene, polypropylene, and polyethylene microplastics, which mimics natural weathering, affects their ability to adsorb the antibiotic tetracycline under different water chemistry conditions. They found that aged microplastics adsorbed significantly more tetracycline than pristine particles, with the effect varying by water type and plastic polymer. The study suggests that as microplastics weather in the environment, they may become increasingly effective at carrying antibiotic contaminants.
Insights into behavior and mechanism of tetracycline adsorption on virgin and soil-exposed microplastics
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Researchers studied how common microplastics absorb the antibiotic tetracycline, finding that soil-exposed plastics absorbed significantly more than fresh ones, with polylactic acid showing the greatest increase at 88%. The study revealed that environmental weathering changes how microplastics interact with antibiotics through different physical and chemical mechanisms. These findings are important for understanding how microplastics may carry and spread antibiotic contamination in soil environments.
Adsorption of levofloxacin by ultraviolet aging microplastics
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Researchers studied how ultraviolet aging changes the ability of common microplastics to adsorb the antibiotic levofloxacin. The study found that UV-aged polystyrene, polyamide, and polyethylene microplastics all showed significantly enhanced adsorption capacity compared to their unaged counterparts, suggesting that weathered microplastics in the environment may carry higher pollutant loads.
Sorption Characteristics of Tetracycline in Water on Microplastics
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This study investigated how tetracycline, a widely used antibiotic, adsorbs onto microplastics under different conditions, finding that microplastics can bind and potentially transport this antibiotic in agricultural environments. The results add to concerns that microplastics in farm soils may facilitate the spread of antibiotic contamination.
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