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Certain nano-scale metal oxides exhibiting the intrinsic enzyme-like reactivity had been used for environment monitoring. Herein, we evaluated the oxidase-mimicking activity of environmentally relevant nano-MnO 2  and its sensitivity to the presence of metal ions, and particularly, the use of MnO 2  nanozyme to potentially detect Cu 2+ , Zn 2+ , Mn 2+ , and Fe 2+  in water. The results indicated the oxidase-like activity of nano-MnO 2  at acidic pH-driven oxidation of 2,6-dimethoxyphenol (2,6-DMP) via a single-electron transfer process, leading to the formation of a yellow product. Notably, the presence of Cu 2+  and Mn 2+  heightened the oxidase-mimicking activity of nano-MnO 2  at 25°C and pH 3.8, showing that Cu 2+  and Mn 2+  could modify the reactive sites of nano-MnO 2  surface to ameliorate its catalytic activity, while the activity of MnO 2  nanozyme in systems with Zn 2+  and Fe 2+  was impeded probably because of the strong affinity of Zn 2+  and Fe 2+  toward nano-MnO 2  surface. Based on these effects, we designed a procedure to use MnO 2  nanozyme to, respectively, detect Cu 2+ , Zn 2+ , Mn 2+ , and Fe 2+  in the real water samples. MnO 2  nanozyme-based detecting systems achieved high accuracy (relative errors: 2.2–26.1%) and recovery (93.0–124.0%) for detection of the four metal ions, respectively. Such cost-effective detecting systems may provide a potential application for quantitative determination of metal ions in real water environmental samples.

Oxidase-Like Catalytic Performance of Nano-MnO2 and Its Potential Application for Metal Ions Detection in Water

Oxidase-Like Catalytic Performance of Nano-MnO₂ and Its Potential Application for Metal Ions Detection in Water