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Light-Driven Polymer Recycling to Monomers and Small Molecules
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Researchers developed and reviewed light-driven photochemical methods for recycling polymers back into monomers and small molecules, presenting an energy-efficient alternative to high-temperature pyrolysis and other chemical recycling approaches. The study shows that photocatalytic depolymerization can achieve selective bond cleavage at lower energy inputs, advancing the viability of circular polymer chemistry.
Only a small proportion of global plastic waste is recycled, of which most is mechanically recycled into lower quality materials. The alternative, chemical recycling, enables renewed production of pristine materials, but generally comes at a high energy cost, particularly for processes like pyrolysis. This review focuses on light-driven approaches for chemically recycling and upcycling plastic waste, with emphasis on reduced energy consumption and selective transformations not achievable with heat-driven methods. We focus on challenging to recycle backbone structures, mainly C‒C, which lack functional groups i.e. esters or amides, that facilitate chemical recycling e.g. by solvolysis. We discuss the use of light, either in conjunction with heat to drive depolymerization to monomers or via photocatalysis to transform polymers into valuable small molecules. The structural prerequisites for these approaches are outlined, highlighting their advantages as well as limitations. We conclude with an outlook, addressing key challenges, opportunities, and provide guidelines for future photocatalyst development.
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Light-driven polymer recycling to monomers and small molecules
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Researchers reviewed how sunlight can be harnessed to chemically break down plastic waste into reusable molecules, offering a lower-energy alternative to heat-based recycling methods like pyrolysis. While still limited to certain plastic types, light-driven recycling shows promise for converting hard-to-recycle plastics into valuable chemical building blocks.
Highly Efficient Photothermal‐Catalytic Depolymerization of Polyester Fiber Enabled by a Phosphotungstate‐Based Palladium Single‐Atom Catalyst
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A photothermal-catalytic process was developed for efficiently depolymerizing specific plastic types using light energy, converting them back to monomers or small molecules. This approach offers a sustainable pathway for chemical plastic recycling that reduces energy demand compared to conventional thermochemical methods.
Advanced Catalytic Strategies for Plastic Depolymerization: Mechanistic Insights, Catalyst Engineering, and Sustainable Upcycling Pathways
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Researchers reviewed catalytic approaches to breaking down plastic waste — including homogeneous, heterogeneous, biocatalytic, photocatalytic, and plasma-assisted methods — cataloguing the mechanistic pathways, catalyst design strategies, and emerging technologies needed to convert polyethylene, polystyrene, PET, and polypropylene into reusable monomers and fuels.
State of the art in the photochemical degradation of (micro)plastics: from fundamental principles to catalysts and applications
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This review summarizes research on the photochemical degradation of plastics and microplastics into value-added products and intermediates via photocatalysis. The study covers fundamental principles and catalytic approaches for breaking down plastic pollutants that are otherwise difficult to degrade in the environment.
Advanced Catalytic Strategies for Plastic Depolymerization: Mechanistic Insights, Catalyst Engineering, and Sustainable Upcycling Pathways
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Researchers reviewed the full landscape of catalytic plastic depolymerization strategies — homogeneous, heterogeneous, biocatalytic, photocatalytic, and pyrocatalytic — assessing how nanostructured materials, metal-organic frameworks, enzyme engineering, and emerging plasma or electrocatalytic methods can convert waste polymers into reusable monomers and fuels.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.