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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.
The chemical inertness and thermal stability of plastics contribute to their durability and stability across a wide range of applications. However, these same properties present significant challenges for their recycling under mild conditions. In this study, a novel photothermal catalytic system is developed featuring Pd single-atom catalysts (SACs) anchored on activated carbon for the efficient and rapid photothermal depolymerization of polyethylene terephthalate (PET) by ethylene glycol (EG). Different from top-down lighting used in other studies, side lighting is used to avoid the negative influence of EG evaporation on the photothermal conversion. By optimizing the structure of the catalyst, near complete PET decomposition within 4 h under a light intensity of 0.5 W cm-2 is achieved. Density functional theory (DFT) calculations reveal for the first time that the unique electronic structure of palladium (Pd) facilitates the nucleophilic attack of EG on PET. The strong coordination between the carbonyl oxygen in PET and the Pd significantly lowers the reaction energy barrier from 37.44 to 26.77 kcal mol-1. This study presents a promising strategy for designing efficient catalysts, offering a cost-effective and sustainable solution for PET recycling.
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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.
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.
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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.
Photocatalytic-Driven Self-Degradation of Polyester Microplastics Under Solar Light
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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 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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