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Enhancing Microplastic Degradation through Synergistic Photocatalytic and Pretreatment Approaches
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Researchers developed a combined photocatalytic and hydrothermal pretreatment approach for degrading PET microplastics. They found that pretreating PET microplastics before photocatalysis improved degradation efficiency by nearly 7 to 9 times compared to untreated particles. The enhanced performance was attributed to increased surface porosity and hydrophilicity of the pretreated microplastics, with hydroxyl radicals identified as the primary driver of degradation.
Microplastics (MPs) pollution has emerged as a pressing environmental concern in recent years. Owing to their minute dimensions, conventional plastic remediation approaches are inadequate for addressing the challenges posed by MPs. Herein, spherical (BOC-S) and nanosheet (BOC-N) BiOCl photocatalysts were prepared and applied to the degradation of poly(ethylene terephthalate) (PET) MPs after hydrothermal pretreatment. The results indicated that the degradation efficiency of pretreated PET MPs using BOC-S and BOC-N photocatalysts was 8.8 and 6.9 times that of the unpretreated MPs under the same conditions. Comparative experiments confirmed the excellent performance of the photocatalysis-pretreatment system. The creation of pores on the surface of pretreated PET MPs facilitates the entry of active substances into the interior to cause damage, while the enhancement of hydrophilicity and specific surface area facilitates the contact between the catalyst and PET MPs, thus increasing the degradation efficiency. Free radical trapping experiments revealed that hydroxyl radicals (·OH) produced by photocatalysis had the greatest influence on the degradation performance of pretreated PET MPs. Finally, a possible photocatalytic degradation mechanism for PET MPs was proposed. This research offers a novel perspective on MPs degradation, providing valuable insights for advancing the efficacy of the process.
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Surface hydroxyl-rich BiOCl/TiO2 and microwave pretreatment synergistically promote photocatalytic degradation of high density polyethylene microplastics
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Researchers developed a novel approach combining a surface hydroxyl-rich photocatalyst with microwave pretreatment to break down high-density polyethylene microplastics. The combined method achieved a 63% weight loss of the microplastics within 20 hours, roughly tripling the degradation rate compared to individual catalysts alone. The study suggests that disrupting the crystalline structure of plastics before photocatalytic treatment significantly improves their breakdown under mild conditions.
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This review summarized the use of photocatalysis for degrading microplastics, covering catalyst types, reaction mechanisms, and operational parameters, and discussing challenges including the stability of highly polymerized plastics and prospects for scaling photocatalytic treatment to address environmental microplastic pollution.
Photocatalytic strategy to mitigate microplastic pollution in aquatic environments: Promising catalysts, efficiencies, mechanisms, and ecological risks
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This review summarizes recent advances in photocatalytic degradation of microplastics, covering catalysts, mechanisms, and reactive oxygen species generation pathways. The authors call for more realistic photocatalytic materials, better mechanistic understanding of degradation intermediates, and quantitative ecological risk assessment of photocatalysis byproducts.
Photocatalytic Degradation of Microplastic in the Environment
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Researchers reviewed photocatalytic degradation as a promising approach for breaking down microplastics in the environment, finding it may offer advantages over incineration and filtration — though practical challenges around scale and efficiency remain.
State of the art in the photochemical degradation of (micro)plastics: from fundamental principles to catalysts and applications
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This review summarizes research on the photochemical degradation of plastics and microplastics into value-added products and intermediates via photocatalysis. The study covers fundamental principles and catalytic approaches for breaking down plastic pollutants that are otherwise difficult to degrade in the environment.
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