Chemical Recycling Processes of Waste Polyethylene Terephthalate Using Solid Catalysts

ChemSusChem, Journal Year: 2023, Volume and Issue: 16(14)

Published: March 27, 2023

Polyethylene terephthalate (PET) is a non-degradable single-use plastic and major component of waste in landfills. Chemical recycling one the most widely adopted methods to transform post-consumer PET into PET's building block chemicals. Non-catalytic depolymerization very slow requires high temperatures and/or pressures. Recent advancements field material science catalysis have delivered several innovative strategies promote under mild reaction conditions. Particularly, heterogeneous catalysts assisted monomers other value-added chemicals industrially compatible method. This review includes current progresses on heterogeneously catalyzed chemical PET. It describes four key pathways for including, glycolysis, pyrolysis, alcoholysis, reductive depolymerization. The catalyst function, active sites structure-activity correlations are briefly outlined each section. An outlook future development also presented.

Language: Английский

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Preparation of renewable porous carbons for CO2 capture – A review

Fuel Processing Technology, Journal Year: 2022, Volume and Issue: 236, P. 107437 - 107437

Published: Aug. 2, 2022

Language: Английский

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Recent advances in plastic recycling and upgrading under mild conditions

Green Chemistry, Journal Year: 2023, Volume and Issue: 25(18), P. 6949 - 6970

Published: Jan. 1, 2023

This review summarizes the emerging advanced technologies including bio-, photo-, electro-, and low-temperature thermocatalysis for recycling upgrading of waste plastics under mild conditions.

Language: Английский

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Metal-catalyzed plastic depolymerization

Cell Reports Physical Science, Journal Year: 2023, Volume and Issue: 4(5), P. 101341 - 101341

Published: March 29, 2023

Polymers have become an indispensable part of our daily lives, and today we produce around 370 MT plastic per year. Only about 20% it is being recycled, the rest, 80%, unleashed into environment without appropriate treatment. This calls forth evaluation strategies available for mitigating menace "after-use" waste. Various approaches evolved over a decade are at different levels development. Plastic depolymerization upcycling considered some most prominent long-term solutions. The metal-catalyzed waste to chemical feedstocks has emerged as one promising ways address global pollution. Therefore, this review aims examine methods, notify recent progress, pinpoint current gaps, gauge potential strategy. Both homogeneous heterogeneous catalysts been reported depolymerize various polymers last decade. Considerable advances in metal-mediated polyolefins, polyesters, polycarbonates, polyurethanes, polyamides, polyethers. above produces monomers or intermediates, which can be used again polymerization thus brings back circularity. overview debates usage high temperatures, sophisticated ligands, expensive metals, stoichiometric reagents, etc., depolymerization. Thus, summarizes understanding fundamental science depolymerization, remaining scientific challenges, opportunities.

Language: Английский

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Beyond biodegradation: upcycling of polylactic acid plastic waste into amino acids via cascade catalysis under mild conditions

Green Chemistry, Journal Year: 2024, Volume and Issue: 26(7), P. 3995 - 4004

Published: Jan. 1, 2024

A cascade technology is demonstrated for upcycling of PLA waste into high-value alanine products under mild conditions.

Language: Английский

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Advancing Textile Waste Recycling: Challenges and Opportunities Across Polymer and Non-Polymer Fiber Types

Polymers, Journal Year: 2025, Volume and Issue: 17(5), P. 628 - 628

Published: Feb. 26, 2025

The growing environmental impact of textile waste, fueled by the rapid rise in global fiber production, underscores urgent need for sustainable end-of-life solutions. This review explores cutting-edge pathways waste management, spotlighting innovations that reduce reliance on incineration and landfilling while driving material circularity. It highlights advancements collection, sorting, pretreatment technologies, as well both established emerging recycling methods. Smart collection systems utilizing tags sensors show great promise streamlining logistics automating pick-up routes transactions. For automated technologies like near-infrared hyperspectral imaging lead way accurate scalable separation. Automated disassembly techniques are effective at removing problematic elements, though other pretreatments, such color finish removal, still to be customized specific streams. Mechanical is ideal textiles with strong mechanical properties but has limitations, particularly blended fabrics, cannot repeated endlessly. Polymer recycling-through melting or dissolving polymers-produces higher-quality recycled materials comes high energy solvent demands. Chemical recycling, especially solvolysis pyrolysis, excels breaking down synthetic polymers polyester, potential yield virgin-quality monomers. Meanwhile, biological methods, their infancy, natural fibers cotton wool. When methods not viable, gasification can used convert into synthesis gas. concludes future hinges integrating sorting advancing solvent-based chemical technologies. These innovations, supported eco-design principles, progressive policies, industry collaboration, essential building a resilient, circular economy.

Language: Английский

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Versatile Chemical Recycling Strategies: Value‐Added Chemicals from Polyester and Polycarbonate Waste

ChemSusChem, Journal Year: 2022, Volume and Issue: 15(8)

Published: Feb. 3, 2022

ZnII -complexes bearing half-salan ligands were exploited in the mild and selective chemical upcycling of various commercial polyesters polycarbonates. Remarkably, we report first example discrete metal-mediated poly(bisphenol A carbonate) (BPA-PC) methanolysis being appreciably active at room temperature. Indeed, Zn(2)2 Zn(2)Et achieved complete BPA-PC consumption within 12-18 mins 2-Me-THF, noting high bisphenol (BPA) yields (SBPA =85-91 %) 2-4 h. Further kinetic analysis found such catalysts to possess kapp values 0.28±0.040 0.47±0.049 min-1 respectively 4 wt%, highest reported date. completely circular approach plastic waste was demonstrated through production several renewable poly(ester-amide)s (PEAs), based on a terephthalamide monomer derived from bottle-grade poly(ethylene terephthalate) (PET), which exhibited excellent thermal properties.

Language: Английский

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Chemical recycling to monomers: Industrial Bisphenol‐A‐Polycarbonates to novel aliphatic polycarbonate materials

Journal of Polymer Science, Journal Year: 2022, Volume and Issue: 60(24), P. 3256 - 3268

Published: April 29, 2022

Abstract The extensive use of commodity polymer materials has led to the depletion natural resources and caused undesirable problem plastic pollution. In this context, design novel polymeric structures with unique recyclability characteristics from renewable recycling real‐life wastes are critical address problems associated increasing demand for plastics. Chemical degradation through polymerization–depolymerization followed by re‐polymerization already emerged as a long‐term strategy toward attainment completely sustainable cycles. Bisphenol‐A‐polycarbonates (BPA–PC) exhibit high thermal resistance, excellent mechanical properties, optical transparency, which make them suitable engineering This review presents our vision realizing circular economy polycarbonate materials—from chemical widely used BPA–PCs aliphatic polycarbonates resources.

Language: Английский

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Achieving affordable and clean energy through conversion of waste plastic to liquid fuel

Journal of the Energy Institute, Journal Year: 2022, Volume and Issue: 106, P. 101154 - 101154

Published: Dec. 10, 2022

Language: Английский

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The thermodynamics and kinetics of depolymerization: what makes vinyl monomer regeneration feasible?

Chemical Science, Journal Year: 2023, Volume and Issue: 15(3), P. 832 - 853

Published: Dec. 5, 2023

Insight into the thermodynamics and kinetics of depolymerization to understand barriers that prevent effective monomer regeneration from vinyl polymers, an exploration overcoming these limitations.

Language: Английский

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