From Plastic Waste to Treasure: Selective Upcycling through Catalytic Technologies

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(41)

Published: Sept. 24, 2023

The huge amount of plastic wastes has become a pressing global environmental problem, leading to severe pollution and resource depletion through conventional downcycling technologies like incineration landfilling. In contrast, selective upcycling various plastics offers promising solution for converting waste into valuable products. This review provides comprehensive overview the recent advancements in innovative catalytic technologies, including thermocatalysis, electrocatalysis, photocatalysis. Special emphasis is placed on elucidating reaction mechanisms, activating designated chemical bonds high selectivity, elaborating above techniques terms conditions Finally, application prospects future development trends catalysis are discussed, providing insights realizing sustainable circular economy.

Language: Английский

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Photocatalysis toward Microplastics Conversion: A Critical Review

ACS Catalysis, Journal Year: 2024, Volume and Issue: 14(11), P. 8694 - 8719

Published: May 20, 2024

Microplastics (MPs, particle size < 5 mm) have become increasingly ubiquitous on Earth due to the cleavage and degradation of heavy use plastics. MPs recently been reported be detected in human blood, alveoli, breast milk, embryos, other organs, raising concerns about their environmental risks. Photocatalysis has identified as a potential means for conversion, which utilizes solar energy stimulate semiconductor photocatalyst. However, study photocatalytic conversion is still incubation period. This review overviews current state-of-the-art technologies conversion. Then, fundamental principles, challenges, analytical techniques, evaluation indexes reforming are highlighted. We systematically summarized recent advances key factors influencing performance. Finally, we propose some perspectives developing efficient systems MPs. will provide guideline applying technology MPs, significantly contribute this emerging research field.

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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Photocatalytic Reforming Raw Plastic in Seawater by Atomically‐Engineered GeS/ZnIn₂S₄

Advanced Energy Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 8, 2025

Abstract The escalating crisis of oceanic plastic pollution demands innovative and effective strategies for resolution. Photocatalysis offers a sustainable, green, energy‐efficient approach the upcycling waste into fuels value‐added chemicals. In this study, an atomically engineered GeS NS/ZnIn₂S₄ photocatalyst is employed to directly transform raw polyethylene terephthalate (PET), ubiquitous plastic, variety organic chemicals (13 917 µmol g⁻¹) using Earth's most abundant resources: sunlight, seawater, air. Advanced ex situ in characterization analyses reveal that sulfur vacancies (Vs) electrolyte‐assisted polarization effect seawater play crucial roles trapping photogenerated electrons accelerating charge carrier separation, respectively. These effects significantly enhance photocatalytic efficiency improve oxidative reactions. This research introduces methodology accounts real‐world conditions upcycling, utilizing natural resources paving way further exploration area.

Language: Английский

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Encapsulation of carbon-nanodots into metal-organic frameworks for boosting photocatalytic upcycling of polyvinyl chloride plastic

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 341, P. 123355 - 123355

Published: Oct. 1, 2023

Although polyvinyl chloride (PVC) ranks as the third most mass-produced synthetic plastic, chemical upcycling of non-biodegradable PVC waste remains a significant challenge. Herein, carbon nanodots combined with metal-organic framework (CDs/Zr-MOF) are fabricated for photocatalytic PVC. Specifically, ultra-small-sized CDs (~2.0 nm) encapsulated into Zr-MOF pores via mild pyrolysis strategy. The maintained MOF structure facilitates charge/mass transfer and improves surface-to-volume ratio active sites CDs. CDs/Zr-MOF exhibits high activity conversion ~76.5% towards acetic acid yield ~14%. mechanism investigation indicates generated •OH radicals can efficiently trigger cleavage C-Cl/C-C bonds Moreover, reduction energy barrier hydroxylation reaction rate-limiting step contributed to improved performance. This work offers feasible method fabricating nanoparticle-embedded MOF-based photocatalysts provides new insights plastics.

Language: Английский

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Photocatalytic production of ethylene and propionic acid from plastic waste by titania-supported atomically dispersed Pd species

Science Advances, Journal Year: 2023, Volume and Issue: 9(49)

Published: Dec. 8, 2023

Current chemical recycling of bulk synthetic plastic, polyethylene (PE), operates at high temperature/pressure and yields a complex mixture products. PE conversion under mild conditions with good selectivity toward value-added chemicals remains practical challenge. Here, we demonstrate an atomic engineering strategy to modify TiO 2 photocatalyst reversible Pd species for the selective ethylene (C H 4 ) propionic acid via dicarboxylic intermediates moderate conditions. -supported atomically dispersed exhibits C evolution 531.2 μmol g cat −1 hour , 408 times that pristine . The liquid product is valuable propanoic 98.8% selectivity. Plastic hydrocarbon yield 0.9% 6.3% was achieved in oxidation coupled 3 hours photoreaction. In situ spectroscopic studies confirm dual role species: electron acceptor boost charge separation/transfer efficient photoredox, mediator stabilize reaction decarboxylation.

Language: Английский

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Recent advancement on photocatalytic plastic upcycling

Chemical Science, Journal Year: 2023, Volume and Issue: 15(5), P. 1611 - 1637

Published: Dec. 27, 2023

This review critically summarizes the recent achievement on various photocatalysts for plastic upcycling. A range of key factors affecting reaction kinetics/thermodynamics are also summarized.

Language: Английский

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Comparative study of synthesis methods and pH-dependent adsorption of methylene blue dye on UiO-66 and NH2-UiO-66

Chemosphere, Journal Year: 2024, Volume and Issue: 353, P. 141543 - 141543

Published: March 4, 2024

Metal-organic frameworks (MOFs) are highly promising adsorbents with notable properties such as elevated adsorption capacities and versatile surface design capabilities. This study introduces two distinct synthesis methods, one lasting 1 h the other 24 h, for UiO-66 NH2-UiO-66. While both methods yield structures comparable crystallinity morphology, performance of cationic methylene blue dye varies at different pH levels. Despite time being optimal maximum absorption in MOFs, relative difference NH2-UiO-66 percentage times suggests reduced dependency on this property. Notably, exhibits consistent effective across three levels, warranting further investigation into its kinetics isotherm. The achievement high efficiency coupled a significantly underscores importance developing simplified synthetic essential enhancing practical applicability MOFs diverse applications.

Language: Английский

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Perspectives on sustainable plastic treatment: A shift from linear to circular economy

TrAC Trends in Analytical Chemistry, Journal Year: 2024, Volume and Issue: 173, P. 117631 - 117631

Published: March 5, 2024

The pervasive presence of plastics in the environment, particularly microplastics, has become a significant global challenge, demanding innovative solutions for their management and upcycling. While traditional methods including landfill incineration face limitations environmental impact, emerging technologies offer promising pathways conversion into valuable chemicals fuels, operating under ambient conditions often utilizing sustainable energy sources. Considering current research progress plastic upgrading, it is necessary to summarize chemical upcycling waste. To this end, review provides an overall examination methodologies treatment, pyrolysis, hydrogenolysis, photocatalysis, electrocatalysis. Existing knowledge gaps future directions are then proposed. Overall, highlights potential these novel approaches aligning with principles circular economy.

Language: Английский

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Photochemical upcycling and recycling of plastics: achievements and future opportunities

Green Chemistry, Journal Year: 2024, Volume and Issue: 26(15), P. 8528 - 8549

Published: Jan. 1, 2024

Recent developments in the photochemical upcycling and recycling of plastics.

Language: Английский

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