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Rutile nanoparticles decorated onto permanently polarized hydroxyapatite for polypropylene solar photodegradation
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Scientists have created a new material that uses sunlight to break down polypropylene microplastics, a common plastic found in food packaging and other everyday products, into useful chemicals like ethanol, instead of letting them linger in the environment. This matters because microplastics have been found in human blood, organs, and even breast milk, and finding ways to break them down safely (rather than just moving them around) could help reduce our long-term exposure. While this research was done in a lab setting rather than real-world conditions like oceans or soil, it offers a promising, eco-friendly approach to tackling plastic pollution using just sunlight and a non-toxic cat
The accumulation of microplastics (μPls) in ecosystems has become a serious environmental concern. Despite increasing awareness, the development of efficient technologies for their removal and remediation remains a major challenge. Herein, we investigate the photocatalytic degradation of polypropylene (PP) μPls using nanocomposite catalysts composed of permanently polarized hydroxyapatite microparticles (pp-HAp) and rutile TiO 2 nanoparticles (TiO 2 NPs). pp-HAp, a macroporous bioceramic, is known for its ability to convert gases (CO 2 or/and N 2 ) into small value-added chemical products. While pp-HAp serves both as the substrate and thermocatalytic part of the composite, TiO 2 NPs are incorporated as the photocatalytic component. A series of XTiO 2 /pp-HAp photocatalyts, where X represents the weight percentage of TiO 2 (X = 2.5, 5, 10 and 20), were prepared applying a thermal stimulated polarization treatment. The resulting materials show no formation of undesirable calcium titanate. After thorough chemical and physical characterization, the photocatalytic performance of the XTiO 2 /pp-HAp in the degradation of PP-μPls was evaluated. Under 1 sun irradiation, the process is selective toward ethanol, which indicates the cleavage of consecutive C C bonds along the PP chains, with the highest yield obtained for 2.5TiO 2 /pp-HAp. When the irradiation intensity decreases (0.5 sun), ethanol and isopropanol are produced, suggesting a reduction in the efficiency of the C C cleavage. In all cases, the nanocomposite catalysts exhibit significantly higher yields than TiO 2 NPs or pp-HAp individually, which indicates cooperative electronic effects between both components. Regarding selectivity, in addition to the solar irradiation, the TiO2:pp-HAp ratio also determines which product is obtained. Within the framework of circular economy, our strategy yields added-value chemical products from PP waste using only sunlight and an environmentally friendly catalyst.
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Tiny plastic particles called micro- and nanoplastics are turning up everywhere, in our oceans, soil, and likely our bodies, raising concerns about long-term health effects. This review rounds up the latest science on using light-activated materials (photocatalysts) to break down these plastic particles, including newer "green" methods made from plants, algae, and bacteria that could make cleanup cheaper and more eco-friendly. While these technologies are still being developed rather than ready for widespread use, they represent a promising direction for tackling plastic pollution at its source.
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"Researchers synthesized a polyester fiber modified with a g-C3N4/TiO2 photocatalyst that can self-degrade under solar illumination, achieving near-complete breakdown into CO2 and water after 400 hours of light exposure. Designing plastics that decompose under sunlight rather than fragmenting into persistent microplastics offers a proactive materials-level strategy to reduce the volume of synthetic polymer pollution entering ecosystems."
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Researchers reviewed nanotechnology-based approaches for degrading plastics in the environment, examining how nanomaterials and nano-catalysts can accelerate the breakdown of persistent polymer waste. Deploying nanotechnology for plastic degradation could help address the millions of tonnes entering oceans annually and reduce the ongoing fragmentation of macroplastics into health-hazardous micro- and nanoplastic particles.
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Researchers tested a UV/TiO2 photocatalytic system with three oxidants for degrading polyethylene and polypropylene microplastics, achieving up to 17% weight loss for PE under UV/TiO2/H2O2 conditions, with FTIR analysis confirming formation of carbonyl degradation products. Photocatalytic degradation represents a promising remediation pathway for breaking down persistent microplastics in water treatment, though further work is needed to improve degradation rates and characterize byproduct toxicity.
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