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Iron oxide nanozymes have pH-dependent peroxidase-like and catalase activities, especially under acidic conditions, it can efficiently catalyze hydrogen peroxide to produce hydroxyl free radicals, and have antibacterial and tumor cell killing functions (chemodynamic therapy) ), at the same time, magnetic iron oxide nanoparticles also have magnetic separation, magnetic resonance imaging, magnetic induction tumor hyperthermia, drug loading and magnetic targeting, long-acting slow-release iron supplementation, promote the transformation of macrophages M1 and M2 types, and promote bone tissue Repair and other functions.