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Degradationof Microplastics and Nanoplastics: AnUnderexplored Pathway Contributing to Atmospheric Pollutants
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This review examined degradation pathways of microplastics and nanoplastics across environmental matrices — including UV photolysis, hydrolysis, and biodegradation — as contributors to nanoplastic formation from larger plastic debris. The authors highlighted that degradation is an underappreciated pathway for generating nano-sized particles that may pose distinct health and ecological risks.
Microplastics (MPs) and nanoplastics (NPs) are widespread pollutants present across all environmental matrices, including the atmosphere. They originate anthropogenically from primary sources, like microbeads, glitters, industrial abrasives, etc., and from secondary sources through degradation of larger plastic products, textile fibers, tire wear, waste incineration, etc. Degradation processes, such as mechanical, photochemical, chemical, and microbial degradation, break down plastics into smaller particles and gaseous byproducts. Atmospheric degradation processes of MPs/NPs enhance their area/volume ratio and introduce oxygenated functional groups at the surface, which increases their hydrophilicity and interactions with other pollutants in the surroundings. Thus, MPs/NPs also act as great vectors for toxic substances, including heavy metals, polycyclic aromatic hydrocarbons, and persistent organic pollutants, amplifying their environmental and health risks. MPs/NPs have been detected in various human tissues and fluids. Being bio-inert, they cannot be metabolized and leave the body only through excretory routes. They not only interact with the human organs directly but also indirectly via releasing additives and adsorbed/absorbed pollutants and, thus, can exhibit higher toxicity compared to other atmospheric aerosols. Furthermore, atmospheric MPs/NPs influence radiative forcing and cloud formation, and their photodegradation also releases greenhouse gases, like CO2, CH4, and volatile organic compounds (precursors of ozone), linking plastic pollution to climate change. Despite their growing recognition, the study of atmospheric MPs and NPs remains in its infancy, with numerous uncertainties surrounding their behavior, fate, and effects. This review aims to highlight underexplored degradation pathways of atmospheric MPs/NPs that may be enhancing their environmental, health, and climatic implications. It also proposes the future directions for atmospheric MP/NP research.
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Degradation of Microplastics and Nanoplastics: An Underexplored Pathway Contributing to Atmospheric Pollutants
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Researchers reviewed how microplastics and nanoplastics degrade in the atmosphere through mechanical, photochemical, and microbial processes, releasing gaseous byproducts and serving as carriers for toxic substances. The study found that atmospheric degradation increases the particles' ability to interact with pollutants like heavy metals and persistent organic chemicals, amplifying health risks. Evidence indicates that airborne microplastics may also influence climate by affecting cloud formation and releasing greenhouse gases during photodegradation.
Degradation of Commonly Used Plastics into Nanoparticles
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This study examined how commonly used plastics degrade into nanosized particles under environmental conditions, tracking the formation of nanoplastics from bulk plastic materials. Nanoplastics are of particular health concern because their tiny size allows them to cross biological barriers more readily than larger microplastic particles.
Oxidation and fragmentation of plastics in a changing environment; from UV-radiation to biological degradation
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This review examines how plastics break down in the environment through UV radiation, weathering, and biological processes, producing smaller and smaller fragments including microplastics and nanoplastics. The breakdown process also releases chemical additives and creates particles with altered surface properties that may be more toxic than the original plastic. Understanding these degradation pathways is critical because the secondary particles produced may pose greater risks to ecosystems and human health than the larger plastic debris.
Analysis of ultraviolet and thermal degradations of four common microplastics and evidence of nanoparticle release
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Researchers studied how UV light and elevated temperature break down four common plastics and found that weathering releases nanoscale plastic particles. Polystyrene and polypropylene were particularly susceptible to UV degradation, generating significant numbers of nanoparticles. The findings confirm that environmental conditions actively fragment microplastics into even smaller, potentially more harmful nanoplastics.
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This review summarizes existing research on how microplastics break down into smaller nanoplastics through sunlight, wear, and microbial activity in water, soil, and waste systems. It also discusses challenges in detecting nanoplastics, their interactions with pollutants and microbes, and gaps in knowledge about health and environmental risks.
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