Green Chemistry, Год журнала: 2024, Номер 27(3), С. 670 - 683
Опубликована: Дек. 3, 2024
Waste-based value-added feedstock.
Язык: Английский
Journal of Analytical and Applied Pyrolysis, Год журнала: 2024, Номер 181, С. 106592 - 106592
Опубликована: Июнь 19, 2024
Язык: Английский
Процитировано
5
Nature Chemical Engineering, Год журнала: 2024, Номер 1(10), С. 615 - 626
Опубликована: Окт. 10, 2024
A circular plastics economy can leverage the lightweight, strong and durable characteristics of macromolecular materials, while simultaneously reducing negative environmental impacts associated with polymer waste. Advanced recycling technologies provide an opportunity to valorize waste extend lifespan these materials by converting into new monomers, polymers or specialty chemicals. Although many advanced appear promising, assessments economic sustainability are often not conducted in a standardized fashion neglect factors such as transportation, sorting pretreatment. These shortcomings lead inaccurate misleading predictions, reduce opportunities for optimization limit industrial relevance. In this Review, we highlight select case studies underscore notable consequences underestimating complexity real-life consumer addition, current challenges assessment viability laboratory-scale processes explored. By discussing relevant analysis frameworks system boundaries, along potential analytical pitfalls, future research will be guided beyond chemical considerations toward impactful solutions. is end-of-life option generation high-value products. This Review highlights importance developing holistic analyses candidate technologies, focus on key parameters, complexities infrastructure, scale-up considerations, trade-offs.
Язык: Английский
Процитировано
5
ACS Organic & Inorganic Au, Год журнала: 2024, Номер 4(4), С. 373 - 386
Опубликована: Май 7, 2024
In order to prevent the current unsustainable waste handling of enormous volumes end-of-use organic polymer material sent landfilling or incineration, extensive research efforts have been devoted toward development appropriate solutions for recycling commercial thermoset polymers. The inability such cross-linked polymers be remelted once cured implies that mechanical processes used thermoplastic materials do not translate Moreover, structural diversity within from use different monomers as well fabrication fiber-reinforced composites make these highly challenging. this Perspective, depolymerization strategies are discussed with an emphasis on recent advancements our group recovering building blocks polyurethane (PU) and epoxy-based materials. While two represent largest groups respect production volumes, landscapes classes vastly different. For PU, increased collaboration between academia industry has resulted in major solvolysis, acidolysis, aminolysis, split-phase glycolysis polyol recovery, where several being evaluated further scaling studies. materials, molecular skeleton no obvious target chemical scission. Nevertheless, we recently demonstrated possibility disassembly epoxy bisphenol A (BPA) recovery through catalytic C–O bond cleavage. Furthermore, a base promoted cleavage developed by us others shows tremendous potential BPA Further still required evaluating suitability monomer at industrial scale. Nonetheless, illustrated presented chemistry suggest future could include emphasize energy efficient manner closed-loop recycling.
Язык: Английский
Процитировано
4
Waste Management, Год журнала: 2024, Номер 192, С. 12 - 19
Опубликована: Ноя. 22, 2024
Язык: Английский
Процитировано
4
Polymer Testing, Год журнала: 2024, Номер 136, С. 108480 - 108480
Опубликована: Июнь 5, 2024
Knowing the exact heavy metal load of recycled plastics is important for their risk assessment. We therefore established a novel strategic hierarchy testing plastics. For preliminary screening unusually high elemental loads, laser-induced breakdown spectroscopy (LIBS) suggested, while inductively coupled plasma-mass spectrometry (ICP-MS) or electrothermal atomic absorption (ETAAS) are used quantification. The contents ten regulated elements (Hg, As, Cd, Cr, Co, Cu, Se, Pb, Sn and Ni) in post-consumer (PCR), post-industrial (PIR), virgin polypropylene (PP) were thus determined. Concentrations PCR mostly found to be two orders magnitude smaller than threshold non-food applications. Cu was most abundant with 18.7±6.1 mg/kg. Concentration variations approx. 30 %. within batch, between batches, slightly higher 40 % observed. Moreover, concentration patterns PIR differ significantly. This strategy may enhance applicational possibilities PCR.
Язык: Английский
Процитировано
3
Chemical Engineering Journal, Год журнала: 2024, Номер 495, С. 153223 - 153223
Опубликована: Июнь 25, 2024
Plastics have undeniably played a crucial role in the technological and societal advancements over past decades. However, current linear consumption model reliance of plastic industry on fossil carbon pose pressing environmental economic challenges that cannot be ignored. In this context, poly(ethylene terephthalate) (PET) has emerged as one most studied plastics field chemical recycling, given its extensive use packaging textiles, susceptibility to undergo solvolysis into constituent monomers, which facilitates closed-loop recycling PET waste. This study presents validation first-of-its-kind continuous flow system utilizes subcritical water for neutral hydrothermal processing at three different reaction temperatures 250, 280 310 °C. Regardless conditions, underwent full conversion monomers low molecular weight esters like mono(2-hydroxyethyl) terephthalate (MHET) bis(2-hydroxyethyl) (BHET), with an approximate distribution 20 % 80 between aqueous solid products, respectively. The product composition is strongly related 77.5 ethylene glycol 94.2 terephthalic acid recovered Furthermore, products were repolymerized assess potential reusing heterogeneous precursor mixture starting material production. Results reveal obtained 250 °C yielded polymer chains decomposition temperature, melting crystallinity, average (50.4 kDa) closest commercial PET. These results underscore future circular value chain.
Язык: Английский
Процитировано
3
Resources Conservation and Recycling, Год журнала: 2025, Номер 218, С. 108262 - 108262
Опубликована: Март 24, 2025
Язык: Английский
Процитировано
0
Waste Management, Год журнала: 2025, Номер 200, С. 114758 - 114758
Опубликована: Март 28, 2025
Язык: Английский
Процитировано
0
Energy, Год журнала: 2025, Номер unknown, С. 136930 - 136930
Опубликована: Июнь 1, 2025
Язык: Английский
Процитировано
0
Journal of Advanced Manufacturing and Processing, Год журнала: 2025, Номер unknown
Опубликована: Июнь 2, 2025
ABSTRACT Many actions are underway at global, national, and local levels to address the plastic waste problem transition toward a circular economy of plastics. Studies evaluating environmental socioeconomic impacts such lacking. The purpose this study is conduct national systems analysis polyethylene terephthalate (PET) packaging supply chains in United States. Material flow data was combined with indicators evaluate compare sustainability linear PET chain, current (2019) possible future chain options Environmentally optimal US material flows showed 31% 38% savings GHG emissions energy demand, respectively, circularity 77% when compared chain. Additionally, environmentally system higher employment (29%) wages (31%) than system, but 5% decrease revenue generation. A socioeconomically increased (by 52%), 67%), revenues 1%), 59% system. However, it 14% indicating trade‐off between systems. Overall, linear‐to‐circular may not necessarily lead decreased entire does benefit society due wages. Future work should focus on improving quality for dimensions.
Язык: Английский
Процитировано
0