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2025-05-21

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cc-by (c) Mello, V. et al., 2025
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/221316

Natural Pyrolusite-Catalyzed Ozonation for Nanoplastics Degradation

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https://doi.org/10.3390/catal15050502

Abstract

The increasing prevalence of polystyrene nanoplastics (PSNPs) in aquatic environments poses significant risks due to their persistence and potential toxicity. Conventional water treatment methods have proven ineffective in removing these emerging pollutants, highlighting the urgent need for sustainable and efficient treatment. This study investigates the application of catalytic ozonation using natural pyrolusite (n-MnO2) and oxalic acid (OA) as a co-catalyst for the environmentally friendly degradation of PSNPs. Key operational parameters, including pH, applied ozone dose, pyrolusite dosage, and OA concentration, were systematically evaluated. Results demonstrate that the MnO2 + OA + O3 system enhances the generation of reactive oxygen species (ROS), leading to improved PSNP removal while maintaining the applied ozone dose compared to the single ozonation reaction. The highest TOC removal of 75% was achieved within 30 min of treatment under optimal conditions (pH = 4, [MnO2] = 0.5 g L−1, [OA] = 10 mg L−1, and ozone dose of 37.5 mg min−1), with significant turbidity reduction, indicating both chemical and physical degradation of PSNPs. Catalyst reusability after three consecutive cycles confirmed minimal loss in activity, reinforcing its potential as a sustainable catalytic system. These findings highlight natural MnO2-driven catalytic ozonation as a green and effective strategy for nanoplastic removal in water treatment applications.

Subject

Ozonització, Poliestirè, Microplàstics

Subject (English)

Ozonization, Polystyrene, Microplastics

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Articles publicats en revistes (Enginyeria Química i Química Analítica)

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MELLO, Victor, et al. Natural Pyrolusite-Catalyzed Ozonation for Nanoplastics Degradation. Catalysts. 2025. Vol. 15(5), num. 502. ISSN 2073-4344. [consulted: 10 of August of 2026]. Available at: https://hdl.handle.net/2445/221316

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