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Next-generation Z-scheme and S-scheme heterojunction photocatalysts for microplastics mineralization
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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 nickel oxide nanoparticles via sol-gel method and demonstrated their photocatalytic degradation of LDPE, PP, PVC, and PET microplastics under sunlight, with NiO/PET nanocomposites achieving approximately 41.64% degradation of PET films in 30 days. Solar-driven photocatalysis using metal oxide nanoparticles offers an eco-friendly and scalable approach to degrading microplastic waste without intensive energy input.
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Researchers reviewed photocatalytic degradation as a promising approach for breaking down microplastics in the environment, finding it may offer advantages over incineration and filtration — though practical challenges around scale and efficiency remain.
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Researchers tested TiO2-clay mineral nanocomposites as photocatalysts for degrading low-density polyethylene microplastics under UV-A light, achieving up to 31% mass loss with TiO2-kaolinite under acidic conditions, outperforming bare TiO2 due to an improved optical band gap and enhanced photocatalytic activity.
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