Toward the development of polyethylene photocatalytic degradation

Kamalian, Parisa; Khorasani, Saied Nouri; Abdolmaleki, Amir; Karevan, Mehdi; Khalili, Shahla; Shirani, Mohammad Ali; Neisiany, Rasoul Esmaeely

doi:10.1515/polyeng-2019-0230

Cited by 56 publications

(14 citation statements)

References 39 publications

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“…These include thermal, catalytic, mechano-chemical, and photooxidative degradation. Among these methods, photocatalytic degradation is considered the most capable [13,14]. For photocatalysis of plastics, organic or traditional photosensitizers and nanoparticles have been used.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Polyethylene Plastic by Non-Embedded Visible-Light Iron-Doped Zinc Oxide Nanophotocatalyst

Zia¹,

Faisal²,

Shams

et al. 2021

Appl. Sci. Converg. Technol.

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This study investigated the photocatalytic degradation of pure low-density polyethylene (LDPE) and commercial-grade polyethylene (PE) films with iron-doped zinc oxide (Fe-ZnO) nanoparticles under visible light. The study was particularly focused on the role of reactive oxygen species (ROS) and the types of plastic degradation. The Fe-ZnO were synthesized using the co-precipitation method and characterized by TEM and XRD. Degradation of 6.35 cm 2 films of LDPE and commercial grade PE was tested under artificial LED light (84 lm/W) and dark in Fe-ZnO suspensions of 10 ml having concentrations ranging from 10 to 1000 𝜇g/ml. The results showed a maximum weight reduction of 13.8 % for pure LDPE films at 200 𝜇g/ml and 15 % for commercial grade PE at 1000 𝜇g/ml in 14 days. In comparison, no weight reduction was observed in the dark, which confirmed that the degradation was induced by the production of ROS moieties in visible light i.e., singlet oxygen (30.11 %), hydroxyl ions (30.45 %), and hydroxyl radicals (39.34 %). The degradation was further confirmed by FTIR with the formation of alcohols and alkenes and SEM analysis that showed visible cracks in both LDPE and PE. The study unveiled Fe-ZnO nanoparticles as an efficient substitute to degrade polyethylene under visible light.

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Section: Introductionmentioning

confidence: 99%

Degradation of Polyethylene Plastic by Non-Embedded Visible-Light Iron-Doped Zinc Oxide Nanophotocatalyst

Zia¹,

Faisal²,

Shams

et al. 2021

Appl. Sci. Converg. Technol.

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“…However, it is known that ZnO manifest a photocatalytic activity [24] . The Photoactivity due from the development of active species that can cause photooxidative degradation of the polymer films through reaction with oxygen and/ or water [25] .…”

Section: Introductionmentioning

confidence: 99%

Improved durability of Bisphenol A polycarbonate by bilayer ceramic nano-coatings alumina-zinc oxide

et al. 2020

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Polycarbonate exposed to sunlight yellows, degrades and loses its usable properties. In order to increase its lifetime, it can be coated with nano-ceramic thin layers of ZnO and Al 2 O 3 deposited by sputtering. The role of the ZnO is to absorb the UV photons that can damageable for the polycarbonate. However, one of the limitations in the use of ZnO is the photocatalytic oxidation that could occur at interface ZnO/PC as a consequence of the photocatalytic activity of this oxide. Insertion of Al 2 O 3 between PC and ZnO could be a way to inhibit this interfacial oxidation. The photooxidation of the ceramic/polymer assemblies, in condition of artificial accelerated ageing, was measured by infra-red and UV-vis spectroscopies. The results show that the photocatalytic activity of ZnO occurring in monolayer coated substrates can be significantly reduced by insertion of Al 2 O 3 and that, in addition, Al 2 O 3 decreases the permeability to oxygen of the coating.

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“…Generally speaking, photoconversion of PE waste always produces plentiful low value-added carbon dioxide (CO 2 ) as the terminal product. 11 Compared with the greenhouse gas of CO 2 , high-energy-density C 2 fuels possess higher market value.…”

mentioning

confidence: 99%

Direct Polyethylene Photoreforming into Exclusive Liquid Fuel over Charge-Asymmetrical Dual Sites under Mild Conditions

Jiao

Zheng

et al. 2022

Nano Lett.

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Direct polyethylene photoreforming to high-energy-density C2 fuels under mild conditions is of great significance and still faces a huge challenge, which is partly attributed to the extreme instability of *CH2CH2 adsorbed on the traditional catalysts with single catalytic sites. Herein, charge-asymmetrical dual sites are designed to boost the adsorption of *CH2CH2 for direct polyethylene photoreforming into C2 fuels under normal temperature and pressure. As a prototype, the synthetic Zr-doped CoFe2O4 quantum dots with charge-asymmetrical dual metal sites realize direct polyethylene photoreforming into acetic acid, with 100% selectivity of liquid fuel and the evolution rate of 1.10 mmol g–1 h–1, outperforming those of most previously reported photocatalysts under similar conditions. In situ X-ray photoelectron spectra, density-functional-theory calculations, and control experiments reveal the charge-asymmetrical Zr–Fe dual sites may act as the predominate catalytic sites, which can simultaneously bond with the *CH2CH2 intermediates for the following stepwise oxidation to form C2 products.

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Toward the development of polyethylene photocatalytic degradation

Cited by 56 publications

References 39 publications

Degradation of Polyethylene Plastic by Non-Embedded Visible-Light Iron-Doped Zinc Oxide Nanophotocatalyst

Degradation of Polyethylene Plastic by Non-Embedded Visible-Light Iron-Doped Zinc Oxide Nanophotocatalyst

Improved durability of Bisphenol A polycarbonate by bilayer ceramic nano-coatings alumina-zinc oxide

Direct Polyethylene Photoreforming into Exclusive Liquid Fuel over Charge-Asymmetrical Dual Sites under Mild Conditions

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