Prussian-blue-modified iron oxide magnetic nanoparticles as effective peroxidase-like catalysts to degrade methylene blue with H2O2

► Prussian-blue (PB)-modified iron oxide magnetic nanoparticles (PBMNPs) were synthesized. ► The removal of methylene blue (MB) using PBMNPs as a catalyst and H2O2 as an oxidant was examined. ► PBMNPs showed high peroxidase-like activity for MB removal and mineralization over a wide pH range. ► PBMNPs promised high magnetization, temperature tolerance, and good stability.