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Chemical Recycling and Upcycling of Plastic Waste: from Linear to Circular Economy
Summary
This review paper rounds up scientific progress on turning plastic waste into new chemicals and materials—instead of just melting it down into lower-quality plastic (what most "recycling" does today, and only for 9% of waste). Better recycling methods matter for your health because plastic that isn't properly processed often ends up in landfills, oceans, or breaking down into microplastics that contaminate our food, water, and even our bodies. These emerging chemical methods could help close the loop on plastic waste, though the researchers note real challenges remain before this happens at scale, including cost and technical hurdles.
The exponential growth of plastic production and the persistence of plastic waste in the environment have created a global pollution crisis. Currently, only 9% of plastic waste is recycled, predominantly through mechanical recycling that produces lower-quality materials. This review examines chemical recycling technologies that convert plastic waste back into monomers or valuable chemicals, enabling true circularity. Polyolefins (polyethylene, polypropylene), polyesters (PET), and mixed plastics are discussed. Recent advances in pyrolysis, solvolysis, and catalytic depolymerization are highlighted, along with upcycling strategies that transform waste plastics into higher-value products such as carbon nanotubes, lubricants, and surfactants. Industrial case studies and remaining challenges including feedstock heterogeneity, catalyst deactivation, and economic viability are addressed.