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Polymer-Dependent Microplastic-Derived DOM Modulates Singlet Oxygen Formation and BPA Degradation in the UV/PMS System
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A lab study examined how dissolved organic matter released from sunlight-aged plastics (polystyrene, PET, polyethylene, and polycaprolactone) affected breakdown of the chemical bisphenol A in water treated with UV light and a cleaning chemical called PMS. The plastic type mattered: matter from PET sped up bisphenol A breakdown the most, while matter from polystyrene slowed it down, with the differences linked to formation of a reactive oxygen molecule called singlet oxygen.
Abstract Microplastic-derived dissolved organic matter (MPs-DOM) released during photoaging can mediate aquatic photochemistry, yet its influence on reactive-species formation in UV/peroxymonosulfate (UV/PMS) systems remains unclear. Herein, MPs-DOM generated from ultraviolet-aged polystyrene (PS), polyethylene terephthalate (PET), polyethylene (PE), and polycaprolactone (PCL) was characterized to evaluate its effects on bisphenol A (BPA) degradation in the UV/PMS system. PET-DOM exhibited higher aromaticity and a higher degree of oxidation, whereas PS-DOM was characterized by less oxidized aromatic structures. Kinetic experiments showed polymer-dependent effects on BPA degradation: PET-DOM produced the highest apparent rate constant (kobs = 1.1051 min–1), PE-DOM and PCL-DOM showed intermediate enhancement, whereas PS-DOM inhibited BPA degradation (kobs = 0.4391 min–1). Reactive oxygen species (ROS) analyses showed that the estimated residual nonradical contribution exceeded 90% in the MPs-DOM-containing systems, while complementary probe and EPR results supported an important role of 1O2-related oxidation. PET-DOM exhibited higher 3DOM* and 1O2 levels together with enhanced BPA degradation, whereas PS-DOM showed lower BPA degradation despite detectable 1O2 formation. Together, these results establish a link between MPs-DOM composition, excited-state reactivity, electron-transfer behavior, and 1O2-related BPA oxidation under controlled UV/PMS conditions.
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When microplastics and microfibers sit in water, they leach dissolved organic matter (DOM) that can react with sunlight to produce reactive chemicals. This study found that the type and amount of DOM released depends heavily on polymer chemistry, with aromatic plastics like PET and polystyrene releasing more light-absorbing DOM, and microfibers releasing more DOM overall than microplastic particles. Understanding how plastic-derived DOM breaks down in sunlight is important because these chemical by-products can interact with other aquatic pollutants and affect aquatic ecosystems in ways not yet fully understood.
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Researchers investigated how dissolved organic matter released from different microplastics (polystyrene, polyethylene, and biodegradable PBAT) affects the aging of polystyrene microplastics under UV irradiation, finding that PBAT-derived organic matter most strongly accelerated plastic photoaging.
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Researchers analyzed the dissolved organic matter that different types of microplastics release into water and how it reacts with sunlight. Plastics with aromatic structures like polystyrene and PET released compounds that broke down faster and generated more reactive oxygen species than polyethylene or polypropylene. Understanding how different plastics chemically alter water quality is important because these released compounds and reactive species can affect aquatic life and the safety of water sources used by people.
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Scientists studied how different types of microplastics release dissolved organic matter into water, finding that UV sunlight dramatically increased the release from PET plastics by 25 times over seven days. The chemical fingerprint of the released compounds differed between PET and polyethylene plastics, with UV exposure making PET compounds harder to break down. This research matters because these leached chemicals can change water quality and may carry additional health risks beyond the plastic particles themselves.
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