), Zhixiang Xua()• A ZrO2@ZIF-90 nanozyme was applied for electrochemical detection of methyl parathion.
• ZrO2 enhanced the phosphohydrolase activity of ZIF-90 and the electrochemical signal.
• The paper provided a new strategy for design and application of multifunctional nanozyme.
In this work, a novel bifunctional zirconium dioxide@zeolitic imidazolate framework-90 (ZrO2@ZIF-90) nanozyme was successfully developed for the catalytic degradation and electrochemical detection of methyl parathion (MP). The ZrO2@ZIF-90 nanozyme with phosphatase hydrolysis activity can convert MP into p-nitrophenol (p-NP). The addition of ZrO2 riched in Lewis acid Zr(Ⅳ) sites significantly enhanced the phosphatase hydrolysis activity of ZIF-90. ZrO2@ZIF-90 also displayed satisfactory electrocatalytic performance on account of the high surface area, high porosity and powerful enrichment ability of the ZIF-90 and the excellent ion transfer capacity of ZrO2. A ZrO2@ZIF-90 nanozyme modified glassy carbon electrode (ZrO2@ZIF-90/GCE) was then fabricated to analyze p-NP formed through MP degradation. Under the optimized conditions, the developed sensor displayed satisfactory analytical performance with a low limit of detection of 0.53 μmol/L and two wide linear ranges (3-10 and 10-200 μmol/L). ZrO2@ZIF-90 nanozyme accomplished to the degradation and electrochemical detection of MP in river water and spiked fruits. This study identifies a promising new strategy for the design of bifunctional nanozymes for the detection of environmental hazards.
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