Dual optimization approach to Mo single atom dispersed g-C3N4 photocatalyst: Morphology and defect evolution

Applied Catalysis B Environment and Energy, Год журнала: 2021, Номер 303, С. 120904 - 120904

Опубликована: Ноя. 7, 2021

Язык: Английский

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Oxidation and fragmentation of plastics in a changing environment; from UV-radiation to biological degradation

The Science of The Total Environment, Год журнала: 2022, Номер 851, С. 158022 - 158022

Опубликована: Авг. 12, 2022

Understanding the fate of plastics in environment is critical importance for quantitative assessment biological impacts plastic waste. Specially, there a need to analyze more detail reputed longevity context degradation through oxidation and fragmentation reactions. Photo-oxidation debris by solar UV radiation (UVR) makes material prone subsequent fragmentation. The fragments generated following exposure mechanical stresses include secondary micro- or nanoparticles, an emerging class pollutants. paper discusses UV-driven photo-oxidation process, identifying relevant knowledge gaps uncertainties. Serious exist concerning wavelength sensitivity dose-response photo-fragmentation process. Given heterogeneity natural irradiance varying from no sediments full floating, beach litter air-borne plastics, it argued that rates degradation/fragmentation will also vary dramatically between different locations environmental niches. Biological phenomena such as biofouling further modulate radiation, while potentially contributing and/or independent UVR. Reductions UVR many regions, consequent implementation Montreal Protocol its Amendments protecting stratospheric ozone, have consequences global heterogeneous manner across geographic zones. interacting effects warming, ozone are projected increase at surface localized areas, mainly because decreased cloud cover. complexity uncertainty future conditions, this currently precludes reliable predictions persistence on scale.

Язык: Английский

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Progress and perspective for conversion of plastic wastes into valuable chemicals

Chemical Society Reviews, Год журнала: 2022, Номер 52(1), С. 8 - 29

Опубликована: Дек. 5, 2022

We divide the up-to-date techniques into two categories: technologies executed under violent conditions and mild conditions, we present a timely summary of mechanism bond cleavage in plastic waste to produce valuable chemicals.

Язык: Английский

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Photocatalytic Conversion of Plastic Waste: From Photodegradation to Photosynthesis

Advanced Energy Materials, Год журнала: 2022, Номер 12(22)

Опубликована: Апрель 21, 2022

Abstract Plastic waste remains a global challenge due to the massive amounts being produced without satisfactory treatment technologies for recycling and upcycling. Photocatalytic processes are emerging as green promising approaches upcycle plastics into value‐added products under mild conditions using sunlight energy source. In this review, recent advances in plastic conversion through photocatalysis have been comprehensively summarized. Special emphasis is placed on photocatalytic mechanism selective CC CH bond transformations of access fuels, chemicals, materials. Finally, challenges perspectives establishing new paradigm toward sustainable circular economy also put forward.

Язык: Английский

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

Nature Communications, Год журнала: 2022, Номер 13(1)

Опубликована: Авг. 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.

Язык: Английский

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

ACS Catalysis, Год журнала: 2022, Номер 12(20), С. 12823 - 12832

Опубликована: Окт. 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).

Язык: Английский

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Molecular engineering of donor-acceptor structured g-C3N4 for superior photocatalytic oxytetracycline degradation

Chemical Engineering Journal, Год журнала: 2022, Номер 448, С. 137370 - 137370

Опубликована: Июнь 6, 2022

Язык: Английский

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Photoreforming of Waste Polymers for Sustainable Hydrogen Fuel and Chemicals Feedstock: Waste to Energy

Chemical Reviews, Год журнала: 2023, Номер 123(8), С. 4443 - 4509

Опубликована: Апрель 17, 2023

Energy from renewable resources is central to environmental sustainability. Among the renewables, sunlight-driven fuel synthesis a sustainable and economical approach produce vectors such as hydrogen through water splitting. The photocatalytic splitting limited by oxidation half-reaction, which kinetically energetically demanding entails designer photocatalysts. Such challenges can be addressed employing alternative half-reactions. Photoreforming drive breakdown of waste plastics biomass into valuable organic products for production H2. We provide an overview photoreforming its underlying mechanisms that convert polymers H2 fuels fine chemicals. This paramount importance two complementary perspectives: (i) green energy harvesting (ii) sustainability decomposing valuables. Competitive results generation without hazards are being generated. process, mechanisms, critical assessment field scarce. address points focusing on concept up-to-date knowledge with key milestones achieved, uncovering concepts in photoreforming, (iii) design photocatalysts pathways use different polymer wastes substrates.

Язык: Английский

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Mechanisms and the Engineering Approaches for the Degradation of Microplastics

ACS ES&T Engineering, Год журнала: 2021, Номер 1(11), С. 1481 - 1501

Опубликована: Сен. 30, 2021

Microplastic waste is an emerging global issue due to its environmental effect of accumulation in ecosystems, and managing systems have given rise presence the aquatic environment. It gaining attention persistent nature potential adverse effects on living organisms. There urgent need for development efficient degradation methods microplastic (MP) treatment. In this review, a comprehensive overview current MPs, such as biological, photo, chemical, mechanical been summarized discussed detail. All fundamental mechanisms MP natural environment are linked with remediation approaches accelerate these that occur nature. Decomposition efficiency applied system's limitations has also mentioned. Furthermore, knowledge gaps about decomposition, future research directions proposed. This work offers summary decomposition provides reference control pollution.

Язык: Английский

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Insight into FeOOH-mediated advanced oxidation processes for the treatment of organic polluted wastewater

Chemical Engineering Journal, Год журнала: 2022, Номер 453, С. 139812 - 139812

Опубликована: Окт. 17, 2022

Язык: Английский

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