Self-Promoted Hydroxyl Radical Releasing Magnetic Zn@Fe Particles

Semiconductor photocatalysts, such as TiO₂ and ZnO, have garnered significant attention for their ability to generate hydroxyl radicals, offering various practical applications. However, the reliance on UV light to facilitate electron-hole separation for hydroxyl radical production poses limitations. In this study, a novel approach is presented utilizing Zn@Fe core/shell particles capable of generating hydroxyl radicals without external energy input. The generation process involves electron donation from Zn to O₂, resulting in the formation of radical species ^.O₂⁻/H₂O₂, followed by Fe-catalyzed conversion of H₂O₂ into hydroxyl radicals through the Fenton reaction. The release of ^.OH imparts good antimicrobial and antiviral properties to the Zn@Fe particles. Furthermore, the inclusion of Fe confers magnetic properties to the material. This dual functionality holds promise for diverse potential applications for the Zn@Fe particles.