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Microplastic fibres from synthetic textiles: Environmental degradation and additive chemical content
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Researchers studied how common synthetic textile fibers — polyester, polyamide, and polyacrylonitrile — degrade in seawater and freshwater under UV light exposure. They found that these fibers release chemical additives as they break down, with polyester and polyamide releasing particularly concerning levels of plastic-related chemicals into the surrounding water.
Microplastic fibres (MPFs) often make up the largest fraction of microplastic pollution in aquatic environments, yet little is known about their degradative fate and persistence. This study investigates the environmentally relevant photodegradation of common MPFs: polyester (PET), polyamide (PA) and polyacrylonitrile (PAN), their respective additive chemical profile, together with their potential for additive leaching. MPFs were subject to ultraviolet (UV) exposure in seawater and freshwater media over 10 months. PET and PA MPFs showed significant fragmentation and surface changes following UV exposure, additionally PA showed evidence of chemical changes. PAN did not undergo significant photodegradation in the same exposure period. Chemicals tentatively identified in MPFs and aqueous leachates via non-target gas chromatography-mass spectrometry include monomers, UV stabilisers and degradation products. Characterisation of several bisphenols (BPs) and benzophenones (BzPs) was performed via ultraperformance liquid chromatography tandem mass spectrometry. Bisphenol A, bisphenol S and benzophenone-3 were quantified in all MPFs and wool at concentrations between 4.3 and 501 ng/g, with wool displaying the highest sum concentration of BPs and BzPs at 863 and 27 ng/g, respectively.
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Researchers exposed natural and synthetic microfibers to UV radiation and found that degradation caused the fibers to fragment into smaller particles while releasing polymer breakdown products and chemical additives. Polyester and polyamide fibers showed distinct degradation patterns, with different chemicals leaching depending on polymer type. The study highlights that microfiber degradation in the environment creates secondary pollution through both physical fragmentation and chemical release.
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Photodegradation Processes and Weathering Products of Microfibers in Aquatic Environments
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