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Aging Characteristics of Degradable and Non-Biodegradable Microplastics and Their Adsorption Mechanism for Sulfonamides
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Aging Characteristics and Adsorption Properties of Microplastics: Research Progress
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Tiny plastic bits (microplastics) don't just sit unchanged in the environment, sunlight, weather, and other natural forces break them down over time, and this "aging" process actually makes them better at soaking up toxic substances like heavy metals. This review pulls together existing research to show that aged microplastics may pose a bigger contamination risk than fresh ones, which matters because these particles can end up in our water, food, and eventually our bodies. Understanding how this works helps scientists better predict the real-world risks microplastics pose to human health.
Adsorption behaviors and mechanisms of azithromycin on degradable and non-degradable microplastics aged with UV/sodium percarbonate
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Scientists found that when microplastics (both regular plastic and "eco-friendly" biodegradable plastic) get weathered by sunlight and cleaning chemicals used in wastewater treatment, their surfaces become rougher and chemically altered, making them up to 4 times better at soaking up azithromycin, a common antibiotic that surged in use during COVID-19. This matters because these antibiotic-loaded microplastics could act as carriers, potentially transporting drugs through water systems and the environment in ways that aren't fully understood yet, including possibly contributing to antibiotic resistance or human exposure down the line.
Investigation of the Adsorption of Norfloxacin by Biodegradable and Non-biodegradable Microplastics Aged by Chemical Oxidation
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Researchers chemically aged three types of microplastics—biodegradable PLA, PET, and polypropylene—and found that aging significantly increased their capacity to adsorb norfloxacin antibiotic, with aged PLA showing the greatest enhancement due to increased surface area and roughness. These results show that environmentally weathered microplastics act as more effective vectors for antibiotic transport in water systems, potentially worsening co-contamination risks for aquatic life and human health.
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Researchers evaluated how plastic aging affects the sorption of pesticides and pharmaceutical compounds onto microplastics, finding that weathering processes alter the polymer surface in ways that change the particle's capacity to absorb and concentrate chemical contaminants, with implications for pollutant transport and ecotoxicological risk.
Insights into the Properties and Adsorption–desorption Behaviors of Aged Microplastics with Different Colors
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Researchers aged black tire wear particles and white polyethylene microplastics under UV light in the presence and absence of algal organic matter, finding that aging increased their adsorption capacity for the antibiotic tetracycline hydrochloride, with the degree of aging and adsorption behavior differing by particle color and composition. This reveals that weathered microplastics in real aquatic environments act as amplified vectors for antibiotic transport, posing compounded risks to aquatic ecosystems and potentially human health through contaminated water sources.
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