Fe₃O₄ Nanodispersions as Efficient and Recoverable Magnetic Nanocatalysts for Sustainable PET Glycolysis

ACS Sustainable Chemistry & Engineering, Год журнала: 2023, Номер 11(19), С. 7586 - 7595

Опубликована: Май 1, 2023

Polyethylene terephthalate (PET), as one of the most indispensable synthetic organic compounds with high strength and transparency properties, can be widely used for textile food packaging. With increasing demand PET production, recycling discarded has attracted great interest. In this work, we first proposed ethylene glycol (EG) dispersions highly dispersed Fe3O4 nanoparticles, which were prepared through a co-precipitation route, efficient recoverable nanocatalysts chemical depolymerization achieved by glycolysis reaction. The as-prepared nanoparticles have an average size 11 nm stably in EG up to 6 months. This process was optimized terms catalyst concentrations, dosages, degradation temperature, reaction time. Furthermore, possible mechanism using presented. More importantly, 100% conversion achieved, bis(2-hydroxyethyl) (BHET) yield reached more than 93% under optimal conditions (Fe3O4/PET = 2%, EG/PET 13, 210 °C 30 min) even after three cycles. are relatively stable during application prospects chemocatalysis future research.

Язык: Английский

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Lactate anion catalyzes aminolysis of polyesters with anilines

Science Advances, Год журнала: 2023, Номер 9(5)

Опубликована: Фев. 1, 2023

Chemical transformation of spent polyesters into value-added chemicals is substantial for sustainable development but still challenging. Here, we report a simple, metal-free, and efficient aminolysis strategy to upcycle polylactic acid by anilines over lactate-based ionic liquids (e.g., tetrabutylammonium lactate), accessing series N-aryl lactamides under mild conditions. This also effective degradation poly(bisphenol A carbonate), affording bisphenol corresponding diphenylurea derivatives. It found that, with the assistance water, lactate anion as hydrogen-bond donor can efficiently activate carbonyl C atom via hydrogen bonding O atom; meanwhile, acceptor, it enhance nucleophilicity N amino H atom. The nucleophilic attack on results in cleavage C─O bond polymers formation target products.

Язык: Английский

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Catalytic Fabric Recycling: Glycolysis of Blended PET with Carbon Dioxide and Ammonia

ACS Sustainable Chemistry & Engineering, Год журнала: 2023, Номер 11(30), С. 11294 - 11304

Опубликована: Июль 17, 2023

The ubiquity of nonbiodegradable polyethylene terephthalate (PET) materials has led to significant waste management challenges. Although PET plastics can be recycled, blended materials, such as PET/cotton fabrics, complicate the recycling process due labile glycosidic bonds in cotton. In this study, we present a practical and scalable approach for interwoven fabrics via catalytic glycolysis with ammonium bicarbonate (NH4HCO3), which decomposed ammonia, carbon dioxide, water. This outperformed conventional acid/base metal catalysis selectively recovering upcycling cotton-based materials. We demonstrated large-scale recovery textile from (up 213 g), showcasing advantages traceless using ammonia CO2 bicarbonate. Owing our metal-free reaction conditions, high-purity bis(hydroxyethyl)terephthalate (BHET) was obtained thermally repolymerized PET. Through thermal analysis, kinetics, control experiments, show that are crucial achieving optimal transesterification. Our method offered traceless, environmentally friendly, polyester cotton recovery, representing step toward sustainable, closed-loop production textiles.

Язык: Английский

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Selective electrocatalytic reforming of PET-derived ethylene glycol to formate with a Faraday efficiency of 93.2% at industrial-level current densities

Chemical Engineering Journal, Год журнала: 2023, Номер 473, С. 145292 - 145292

Опубликована: Авг. 8, 2023

Язык: Английский

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Overview of polymers and biopolymers degradation and stabilization towards sustainability and materials circularity

Polymer, Год журнала: 2024, Номер 306, С. 127136 - 127136

Опубликована: Май 19, 2024

Язык: Английский

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