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Ultraviolet C radiation on polypropylene: A potential way to reduce plastic pollution
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This study investigated applying ultraviolet C (UVC) radiation to polypropylene-containing healthcare items like personal protective equipment as a sterilization method to extend their lifespan and reduce plastic waste. FTIR and Raman spectroscopy showed only slight PP degradation under UVC exposure, and TLD-100 thermoluminescence dosimeters were identified as the most promising tool for detecting and verifying UVC treatment within plastic samples.
This study investigates the application of ultraviolet C (UVC) radiation to extend the lifetime of healthcare items containing polypropylene (PP), particularly personal protective equipment (PPE). The main objectives involve assessing possible PP damage from UVC exposure and detecting UVC treatment within PP samples. FTIR spectroscopy and Raman spectroscopy reveal slight degradation in UVC-irradiated PP samples, demonstrating resilience post-treatment. Investigations using commercial thermoluminescence dosimeters (TLD-100, TLD-200, TLD-400 and GR-200) positioned under varying thicknesses of PP (0.20 and 0.80 mm) identify TLD-100 as a promising UVC detector. Conversely, TLD-200 and TLD-400 do not prove to be effective detectors, exhibiting similar behavior to the dosimeters without a plastic sample. And GR-200 does not possess the capability to differentiate between ionizing and non-ionizing components of UVC radiation. This research emphasizes the role of UVC to prolong the lifetime of healthcare items containing PP, thus aiding in efforts to reduce plastic pollution.
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Researchers tested whether thermoluminescence dosimeters could detect UVC radiation passing through PET food packaging films of varying thickness, finding these commercial dosimeters can effectively monitor UVC exposure through PET, while FTIR analysis revealed that UVC irradiation induces structural changes in the plastic itself.
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Raman imaging showed that ultraviolet light irradiation causes polypropylene films to undergo localized recrystallization, creating uneven microstructural changes across the plastic surface. Understanding how UV exposure alters plastic structure at the microscale is relevant to predicting how sunlight-driven weathering generates microplastics from larger plastic items in the environment.
Plasma, UV radiation and ozone for microplastics degradation: Optical characterization of polystyrene, polyethylene and polypropylene degradation using FTIR and Raman spectroscopy
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Researchers investigated the degradation of polypropylene, polyethylene, and polystyrene microplastics under three treatment conditions — ozone, UV radiation, and plasma — using FTIR and Raman spectroscopy to characterize structural and optical changes. The study found that all three treatments induced measurable polymer degradation, with spectral analysis revealing distinct chemical modifications depending on treatment type and polymer composition.
Gaseous products generated from polyethylene and polyethylene terephthalate during ultraviolet irradiation: Mechanism, pathway and toxicological analyses
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Researchers identified more than 50 different volatile organic compounds released from polyethylene and polyethylene terephthalate microplastics during ultraviolet irradiation in water. The study found that UV-C produced more gaseous byproducts than UV-A, and toxicological analysis suggested that some of these volatile compounds could pose risks to humans and the environment, highlighting an often-overlooked pathway of microplastic degradation.
Quantifying UVC-Induced Aging of Microplastics Using a Multivariate Aging Score
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Researchers examined how UVC radiation ages three common types of microplastics and found that polypropylene degraded far more rapidly than polyethylene or PET, developing widespread surface cracks and generating secondary plastic fragments. They developed a multivariate aging score that combines chemical and physical measurements to better quantify how microplastics deteriorate over time. The study also found that colored polypropylene products aged faster than transparent ones, highlighting how product formulation influences environmental breakdown.
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