Catalytic oxidation of polystyrene to aromatic oxygenates over a graphitic carbon nitride catalyst

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: Aug. 16, 2022

The continuous increase in manufacturing coupled with the difficulty of recycling plastic products has generated huge amounts waste plastics. Most existing chemical and upcycling methods suffer from harsh conditions poor product selectivity. Here we demonstrate a photocatalytic method to oxidize polystyrene aromatic oxygenates under visible light irradiation using heterogeneous graphitic carbon nitride catalysts. Benzoic acid, acetophenone, benzaldehyde are dominant liquid phase when conversion reaches >90% at 150 °C. For transformation 0.5 g waste, 0.36 is obtained. reaction mechanism also investigated various characterization procedes via activation form hydroxyl carbonyl groups over its backbone C-H bond oxidation which followed by oxidative breakage C-C further processes oxygenates.

Language: Английский

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Trash to Treasure: Photoreforming of Plastic Waste into Commodity Chemicals and Hydrogen over MoS₂-Tipped CdS Nanorods

ACS Catalysis, Journal Year: 2022, Volume and Issue: 12(20), P. 12823 - 12832

Published: Oct. 7, 2022

Plastic valorization presents a significantly untapped opportunity to address environmental issues while creating the necessary economic push for circular carbon economy. Compared with conventional routes processing plastics (e.g., pyrolysis and gasification), photoreforming strategy, namely, photocatalytic plastic oxidation paired water splitting, aims achieve into commodity chemicals under mild conditions offering hydrogen fuels. Here, we implement MoS2-tipped CdS nanorod photocatalysts in an aqueous medium reform pretreated that range from polyesters polylactic acid (PLA) polyethylene terephthalate (PET)) polyolefins (PE)). The architecture of MoS2/CdS takes advantage anisotropic morphology rapid charge transfer features nanorods, by collecting electrons at MoS2 tip evolution utilizing entire sidewall nanorods rich holes toward oxidation. It is shown continuous H2 can be evolved PLA, PET (commercial granules real-world bottles), PE, these substrates are accordingly converted series valuable chemicals. This work provides effective way harness solar energy realize transformation trash (plastics) treasure (gaseous/liquid chemicals).

Language: Английский

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Plastic Waste Valorization by Leveraging Multidisciplinary Catalytic Technologies

ACS Catalysis, Journal Year: 2022, Volume and Issue: 12(15), P. 9307 - 9324

Published: July 18, 2022

Plastic waste triggers a series of concerns because its disruptive impact on the environment and ecosystem. From point view catalysis, however, end-of-life plastics can be seen as an untapped feedstock for preparation value-added products. Thus, development diversified catalytic approaches valorization is urgent. Previous reviews this field have systematically summarized progress made plastic reclamation. In review, we emphasize design processes by leveraging state-of-the-art technologies from other developed fields to derive valuable polymers, functional materials, chemicals plastics. The principles, mechanisms, opportunities chemical (thermo-, electro-, photocatalytic) well biocatalytic ones are discussed, which may provide more insights future processes. Finally, outlooks perspectives accelerate toward feasible economy discussed.

Language: Английский

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Photocatalytic systems: reactions, mechanism, and applications

RSC Advances, Journal Year: 2024, Volume and Issue: 14(29), P. 20609 - 20645

Published: Jan. 1, 2024

The photocatalytic field revolves around the utilization of photon energy to initiate various chemical reactions using non-adsorbing substrates, through processes such as single electron transfer, or atom transfer.

Language: Английский

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Photoredox-Catalyzed Plastic Waste Conversion: Nonselective Degradation versus Selective Synthesis

ACS Catalysis, Journal Year: 2023, Volume and Issue: 13(6), P. 3575 - 3590

Published: Feb. 27, 2023

Plastic waste pollution is becoming one of the most pressing environmental crises due to large-scale production without satisfactory recycling schemes, especially with outbreak COVID-19 pandemic in recent years. Upcycling plastic into valuable chemicals powered by solar energy presents a substantially untapped opportunity turn treasure. In this review, fundamental principles from nonselective degradation selective synthesis are first clarified. Then, we aim outline representative advances photoredox-based catalytic conversion. Particular emphasis placed on valorization regarding versus synthesis. Finally, present challenges and individual insights for further exploration conversion domain. It anticipated that timely critical review would provide an instructive direction foresight plastics value-added chemical feedstocks, thus stimulating development circular sustainable economy coming decades.

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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Toward carbon neutrality: Selective conversion of waste plastics into value-added chemicals

Matter, Journal Year: 2023, Volume and Issue: 6(10), P. 3322 - 3347

Published: Oct. 1, 2023

Language: Английский

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State of the art in the photochemical degradation of (micro)plastics: from fundamental principles to catalysts and applications

Journal of Materials Chemistry A, Journal Year: 2023, Volume and Issue: 11(6), P. 2503 - 2527

Published: Jan. 1, 2023

Plastics and microplastics are major environmental pollutants due to wide applications difficult degradations. Herein, we summarize several studies on degradations of (micro)plastics value-added products intermediates via photocatalysis.

Language: Английский

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Degradation of plastic wastes to commercial chemicals and monomers under visible light

Science Bulletin, Journal Year: 2023, Volume and Issue: 68(14), P. 1522 - 1530

Published: June 26, 2023

Language: Английский

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Photocatalytic Valorization of Plastic Waste over Zinc Oxide Encapsulated in a Metal–Organic Framework

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(28)

Published: April 21, 2023

Abstract The conversion of waste plastic into high‐value‐added chemicals is regarded as a promising approach for relieving global pollution and contributing to the circular economy. Herein, partial calcination strategy developed fabricate zinc oxide/UiO66‐NH 2 (ZnO/UiO66‐NH ) heterojunction, in which ZnO encapsulated porous UiO66‐NH photocatalytic valorization plastic. This preserves framework structure , thus enabling formation with ultra‐small size distributed inside skeleton. synergistic effect obtained ZnO/UiO66‐NH heterojunction facilitates providing an efficient channel carrier/mass transfer guarantees structural stability. As result, exhibits high activity converting polylactic acid (PLA) polyvinyl chloride (PVC) acetic acid, coupled H production. work provides feasible rationally designing photocatalysts, well insight understanding process

Language: Английский

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