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Comprehensive screening of microplastic degradation by photo-Fenton oxidation: A comparative approach between different polymers
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Scientists tested a water-treatment method (using light, iron, and hydrogen peroxide) to break down tiny plastic fragments called microplastics, which are showing up in our water, food, and even our bodies. They found this treatment could break down up to 74% of some plastic types like polystyrene (foam packaging), though others like PET (common in bottles) and PVC broke down less easily—suggesting this technique could someday help remove more microplastic pollution from water, but effectiveness depends heavily on the specific plastic type involved.
Microplastics (MPs) are persistent pollutants of growing environmental concern, and advanced oxidation processes (AOPs) have been increasingly investigated as promising routes to accelerate their transformation beyond conventional treatments. In this study, homogeneous photo-Fenton oxidation was applied to cryo-milled commercial MPs (50–100 µm) of polyethylene terephthalate (PET), low-density polyethylene (LDPE), polycarbonate (PC), polyvinyl chloride (PVC), and expanded polystyrene (EPS) to assess polymer-dependent degradation under controlled conditions. Degradation was quantified through a combined solid–liquid carbon assessment based on gravimetric weight loss (solid-phase removal) and aqueous Total Organic Carbon (TOC) (mineralization yield). Scanning Electron Microscopy (SEM) provided insights into particle morphology and surface damage, while Energy-Dispersive X-ray Spectroscopy (EDS) and Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy (ATR-FTIR) were employed to track elemental and chemical changes, respectively. Finally, elemental analysis was used to assess bulk compositional shifts during oxidation. A polymer-dependent degradation trend was observed after 8 h of photo-Fenton treatment, EPS (≈74 %) > LDPE > PC > PET ≈ PVC (≈40 %), accompanied by extensive mineralization (aqueous TOC < 1 mg L −1 ). Clear oxidation signatures were also found on MPs surfaces, including the emergence of surface pitting, cavities, and microcracks in SEM, together with increased oxygenated functionalities detected by ATR-FTIR/EDS. The degradation kinetics of EPS and PET were successfully described by the Shrinking Core Model (SCM) for spherical particles (R 2 > 0.99), indicating ash-layer diffusion behavior for EPS and surface chemical control behavior for PET.
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Scientists tested a water treatment method that uses light, iron, and hydrogen peroxide (called photo-Fenton oxidation) to break down microscopic plastic particles in water, and found it can fully destroy these plastics even in real-world water sources like tap water, bottled water, and treated wastewater—though minerals and organic matter naturally found in water slow the process down. This matters because it shows a practical path toward removing tiny plastic particles from our drinking water and water recycling systems, which could reduce human exposure to microplastics linked to health concerns.
Evaluation of Fenton, Photo-Fenton and Fenton-like Processes in Degradation of PE, PP, and PVC Microplastics
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Scientists tested whether Fenton-based chemical processes, which use iron and hydrogen peroxide to create powerful cleaning reactions, could break down common microplastics in water. They found that the photo-Fenton process (using UV light) was effective at degrading polyethylene and PVC microplastics, but polypropylene was resistant to all treatments. This research is important because it explores practical ways to destroy microplastics in water treatment, though not all plastic types respond equally.
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Researchers tested photo-Fenton oxidation as a treatment method for microplastics, comparing degradation efficiency across different polymer types. The study found that polymer chemistry significantly influences how quickly microplastics break down under this oxidative treatment.
Advanced Oxidation Processes For Microplastic Removal From Water: A Comparative Study Of UV/H₂O₂, Ozonation, And Fenton Reactions
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Lab tests treated water samples spiked with polyethylene and polystyrene microplastic particles using three chemical treatment methods. All three methods broke down 68% to 95% of the microplastics, with the Fenton reaction working best and smaller particles breaking down more easily than larger ones.
Degradation of polystyrene nanoplastics by photo-Fenton oxidation in water
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Researchers tested photo-Fenton oxidation (using iron, hydrogen peroxide, and light) to degrade polystyrene nanoplastics in water, finding that while the process significantly altered particle surfaces and reduced molecular weight, complete mineralization required extended treatment times. Photo-Fenton oxidation shows promise as an advanced water treatment technology for removing persistent nanoplastic particles.
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