MOF-derived Fe-doped δ-MnO 2 nanoflowers as oxidase mimics: chromogenic sensing of Hg( ii ) and hydroquinone in aqueous media

(0.47 μM) outperformed conventional metal oxide-based nanozymes. These findings may pave the way for the development of easily synthesizable, scalable and highly sensitive MOF-derived metal oxide nanozymes with promising applications in biological and environmental settings.