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Removal and Degradation of Microplastics Using the Magnetic and Nanozyme Activities of Bare Iron Oxide Nanoaggregates
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Researchers demonstrated that hydrophilic bare Fe3O4 nanoaggregates can magnetically remove five common microplastics — including HDPE, PP, PVC, PS, and PET — at just 1% of microplastic mass via hydrogen bonding, and subsequently degrade the captured plastics through the nanoaggregates' peroxidase-like nanozyme activity in a single integrated process.
Abstract Removal and degradation of microplastics are often carried out separately. In this work, hydrophilic bare Fe 3 O 4 nanoaggregates allowed efficient removal of the most common microplastics including high‐density polyethylene, polypropylene, polyvinyl chloride, polystyrene, and polyethylene terephthalate. Full extraction was achieved using Fe 3 O 4 at 1 % of the mass of microplastics. Hydrogen bonding is the main force for the adsorption of Fe 3 O 4 . Unlike the more commonly used hydrophobically modified Fe 3 O 4 nanoparticles, the bare Fe 3 O 4 benefitted from the peroxidase‐like activity of its exposed surface, enabling further catalytic degradation of microplastics with nearly 100 % efficiency and easy recovery of the Fe 3 O 4 .
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