Removal and degradation of microplastics are often carried out separately. In this work, hydrophilic bare Fe O 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 O at 1 % of the mass of microplastics. Hydrogen bonding is the main force for the adsorption of Fe O . Unlike the more commonly used hydrophobically modified Fe O nanoparticles, the bare Fe O 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 O .