Analysis of photocatalytic degradation of polyamide microplastics in metal salt solution by high resolution mass spectrometry

Zhong, Yunjin; Li, Zhuo; Lü, Wangyang

doi:10.1016/j.jes.2023.06.018

Cited by 16 publications

(3 citation statements)

References 38 publications

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“…Remarkably, FeCl 3 has been studied for the degradation of polyamides, highlighting the potential of iron salts to facilitate the upcycling of a wider scope of polymers. 68 This promising approach suggests that future research could successfully expand photochemical upcycling methods to include polyamides, addressing a significant gap in sustainable plastic waste management. The potential use of such catalysts could significantly expand the scope of photochemical upcycling, offering new pathways for converting previously underexplored waste into valuable materials.…”

Section: Miscellaneousmentioning

confidence: 99%

Photochemical upcycling and recycling of plastics: achievements and future opportunities

Mountanea,

Skolia,

Kokotos

2024

Green Chem.

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Section: Miscellaneousmentioning

confidence: 99%

Photochemical upcycling and recycling of plastics: achievements and future opportunities

Mountanea,

Skolia,

Kokotos

2024

Green Chem.

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“…29−31 Through implemention of the melt direct spinning technology after slicing and a target viscosification process, the ideal viscosification effect was achieved without affecting the performance indexes of polyamide industrial fiber. 32 It also reduces equipment costs, energy consumption, and operational expenses. 33−35 However, high-temperature conditions promote degradation reactions, which can cause yellowing, increased chain branching, and a higher content of oligomers and degradation products.…”

Section: Introductionmentioning

confidence: 99%

“…Melt postpolycondensation (MPP) is characterized by its shorter reaction times and lower energy requirements compared to SSP. − Through implemention of the melt direct spinning technology after slicing and a target viscosification process, the ideal viscosification effect was achieved without affecting the performance indexes of polyamide industrial fiber . It also reduces equipment costs, energy consumption, and operational expenses. − However, high-temperature conditions promote degradation reactions, which can cause yellowing, increased chain branching, and a higher content of oligomers and degradation products. − These alterations detrimentally impact the quality of the polymer. − The MPP reaction is also reversible.…”

Section: Introductionmentioning

confidence: 99%

Kinetics Comparison of Solid-State Polycondensation and Melt Postpolycondensation for Polyamide 6 with Controllable Extractive Content

Chen,

Zhong,

Chen

2024

Ind. Eng. Chem. Res.

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This research delves into the kinetics of solid-state polycondensation (SSP) and melt postpolycondensation (MPP) of polyamide 6, with a particular focus on managing extractable content. We scrutinize how reaction time and temperature influence key properties, such as relative viscosity, oligomer content, and end group content in PA6 during SSP and MPP. A sophisticated kinetic model was formulated to discern the reaction rate constants and activation energies of PA6, especially considering the presence of low-molecular-weight extractable small molecules. The results indicate that MPP surpasses SSP in swiftly lowering monomer and oligomer concentrations, with minimal impact from reaction temperature. Extractable small molecules inhibit PA6 chain expansion, with a higher initial oligomer content leading to slower chain growth. Analysis of end group content and reaction kinetic models revealed activation energies of 124.25 and 146.39 kJ/mol for the P4 and P8 stations during SSP, related to viscosity increases. In contrast, melt postpolycondensation showed activation energies of 127.62 and 137.43 kJ/mol for P4 and P8, suggesting its superiority for highextractable materials due to its dual role in devolatilization and viscosity enhancement. This integrated approach eliminates the need for separate extractable small molecules removal, offering a technological edge by directly producing processable melts and streamlining the production workflow.

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Cutting‐Edge Strategies and Advancements for Combating Synthetic Polymer Pollution in Various Environmental Samples: A Review

Sajad,

Allam,

Banerjee

et al. 2024

ChemistrySelect

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Plastic debris is unavoidably released into the ecosystems, and their physicochemical and mechanical qualities deteriorate when exposed to the environment. This, ultimately, leads to the generation of tiny fragments of plastic, which are known as nanoplastics (<1000 nm) and microplastics (<5 mm). Over the past few years, the pollution of synthetic polymers has been reported in almost all the compartments of the environment across the globe. It is regarded as a hazard to both human health and natural systems. In addition, synthetic polymers act as vectors for contaminants as they can adsorb and accumulate contaminants from seawater. The accumulation of plastic waste in the environment and its widespread presence have drawn the attention of policymakers and the public. This global issue has led to the creation of numerous remediation solutions by innovators in previous decades, either to clear up old waste or to stop plastic from entering the various matrices of the environment. This review focused on the extensive scientific research available on effective techniques for removing plastic debris to promote positive action and progress in this important area. Despite the various challenges, these techniques offer vital opportunities, from increasing awareness to enhancing environmental quality. Further, the article has been enriched by incorporating bibliometric data that illustrates the widely used methods for removing microplastics from various environmental matrices. According to the data analysis, numerous remediation techniques have been developed to date (2010 and 2024). These techniques encompass various approaches, among which the chemical‐based methods enjoy more success. This success can be attributed to the diverse advantages offered by chemical‐based methods over other remediation techniques. Much research is now focused on overcoming the disadvantages and developing more efficient and environmentally sound technologies.

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Analysis of photocatalytic degradation of polyamide microplastics in metal salt solution by high resolution mass spectrometry

Cited by 16 publications

References 38 publications

Photochemical upcycling and recycling of plastics: achievements and future opportunities

Photochemical upcycling and recycling of plastics: achievements and future opportunities

Kinetics Comparison of Solid-State Polycondensation and Melt Postpolycondensation for Polyamide 6 with Controllable Extractive Content

Cutting‐Edge Strategies and Advancements for Combating Synthetic Polymer Pollution in Various Environmental Samples: A Review

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