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A portable sensor for visual monitoring of Fe and HO, two-dimensional CoO modified by nano-IrO (IrO@2D CoO) was prepared in this work, for the first time, with the help of microwave radiation at 140 °C, which was further stabilized onto common test strips. The present IrO@2D CoO possessed superior dual-function enzyme-like activity with low toxicity and excellent biocompatibility. Especially, trace Fe and HO could exclusively alter their enzyme-like catalytic activity with discriminating hyperchromic or hypochromic effect, i.e., from blue to colorless or to dark blue for both IrO@2D CoO dispersion and its functionalized test strips. The linear regression equations were A = 0.5940 - 0.00041 c (10 M, R = 0.9927) for Fe and ∆A = 0.0023 c + 0.00025 (10 M, R = 0.9982) for HO, respectively. When applied to visual monitoring of aqueous Fe and intercellular HO, the recoveries were 101.2 ~ 102.5% and 95.8 ~ 103.7% with detection limits of 1.25 × 10 mol/L and 1.02 × 10 mol/L, respectively, far below the permitted values in drinking water set by the World Health Organization. The mechanisms for the enhancing enzyme-mimetic activity of IrO@2D CoO and its selective responses to Fe and HO were investigated in detail.
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