MXene Quantum Dot-Modified Flower-Like FeOOH for Dual-Mode Nitrite Sensing

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

ACS Applied Nano Materials Pub Date : 2024-10-23 DOI:10.1021/acsanm.4c0480010.1021/acsanm.4c04800

Xiaoyu Zhan, Zhiyun Ding, Shiyao Shang, Ke Chu and Yali Guo*,

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Abstract

Nowadays, the rational design of high-performance simulated nanozymes applied to environmental detection has become a current research hotspot. Herein, we employ a urea/ethanol solution synergistic-mediated approach to prepare MQDs@FeOOH nanozymes with significant peroxidase activity. The steady-state fluorescence analysis and density-functional theory calculations (DFT) investigated that the MQDs@FeOOH nanozymes possess remarkable catalytic activity. This is attributed to the active sites of the Fe-Ti dimer, which effectively adsorb H₂O₂ and activate its decomposition into reactive •OH. We have developed a dual-mode assay combining colorimetric and electrochemical methods for the determination of nitrite in the environment. The detection limits are 1.58 and 2.99 μM, achieving a facile determination in the range of 50–300 μM. It also demonstrates the advantages of high sensitivity, anti-interference, and reliability. This work provides an idea for the preparation of nanomaterials with high-performance peroxidase activity and demonstrates their wide application in environmental monitoring.

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用于亚硝酸盐双模传感的 MXene 量子点修饰花状 FeOOH

目前，合理设计应用于环境检测的高性能模拟纳米酶已成为研究热点。在此，我们采用尿素/乙醇溶液协同介导的方法制备了具有显著过氧化物酶活性的MQDs@FeOOH纳米酶。稳态荧光分析和密度泛函理论（DFT）计算表明，MQDs@FeOOH纳米酶具有显著的催化活性。这要归功于 Fe-Ti 二聚体的活性位点，它能有效吸附 H2O2 并激活其分解为活性 -OH。我们开发了一种结合比色法和电化学法的双模式检测方法，用于测定环境中的亚硝酸盐。其检测限分别为 1.58 和 2.99 μM，可在 50-300 μM 范围内轻松测定。此外，该方法还具有灵敏度高、抗干扰性强、可靠性高等优点。这项工作为制备具有高性能过氧化物酶活性的纳米材料提供了思路，并证明了其在环境监测中的广泛应用。

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来源期刊

ACS Applied Nano Materials Multiple-

CiteScore

8.30

自引率

3.40%

发文量

1601

期刊介绍： ACS Applied Nano Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics and biology relevant to applications of nanomaterials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important applications of nanomaterials.