Defect‐Engineered Luminescent Nanozyme with Enhanced Phosphohydrolase Activity for Degradation and Dual‐Mode Detection of Paraoxon
Xiaochen Liao, Bai Li, Wang Li, Yang Chen
Abstract
Abstract The excessive use of organophosphorus pesticides poses a substantial threat to both human health and the environment. Consequently, there is an urgent need for new methods that can quickly degrade and sensitively detect these compounds. A versatile nanozyme based on the biomimetic principle is an effective strategy to solve this problem. In this study, a multifunctional luminescent nanozyme Eu@Ce/UiO‐67 composed of Eu 3+ and a bimetallic organic framework Ce/UiO‐67 is developed for the degradation and dual‐mode detection of paraoxon. The doping of Ce 4+ results in the formation of more defective structures in Eu@Ce/UiO‐67, which significantly enhances the phosphatase activity of Eu@Ce/UiO‐67 and the degradation efficiency of paraoxon. The hydrolysis product 4‐nitrophenol (4‐NP) shows a distinct UV‐vis absorption in the visible light region and can quench the fluorescence of Eu@Ce/UiO‐67 by the effect of photo‐induced electron transfer (PET), thus achieving dual‐mode detection of paraoxon by colorimetric and fluorescent methods. This study provides a new idea for the simultaneous monitoring and degradation of organophosphorus pesticides, expanding the boundaries of “integration of diagnosis and treatment” for environmental pollutants.