MIL-88B(Fe)-NH2: an amine-functionalized metal–organic framework for application in a sensitive electrochemical sensor for Cd2+, Pb2+, and Cu2+ ion detection,RSC Advances

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MIL-88B(Fe)-NH2: an amine-functionalized metal–organic framework for application in a sensitive electrochemical sensor for Cd2+, Pb2+, and Cu2+ ion detection
RSC Advances ( IF 3.9 ) Pub Date : 2023-07-19 , DOI: 10.1039/d3ra02828c
Luyen T Tran ₁ , Hue T M Dang ₁ , Hoang V Tran ₁ , Giang T L Hoang ₁ , Chinh D Huynh ₁

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We propose here an electrochemical platform for multi-heavy metal ion detection in water based on MIL-88B(Fe)-NH₂, an amine-functioned metal–organic framework (MOF) for modifying the surface of a glassy carbon electrode (GCE). Herein, MIL-88B(Fe)-NH₂ with abundant functionalized amine groups can play the role of capture sites for the enrichment of metal ions before electrochemical oxidation sensing. MIL-88B(Fe)-NH₂ was synthesized under optimized conditions through a solvothermal method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transition electron microscopy (TEM), Fourier-transform infrared spectroscopy (FT-IR), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) techniques. MIL-88B(Fe)-NH₂ was then drop-casted on GCE to electrochemically determine the Cd²⁺, Pb²⁺ and Cu²⁺ ion concentrations by differential pulse voltammetry (DPV). The electrochemical sensor exhibits excellent electrochemical performance toward Cd²⁺, Pb²⁺ and Cu²⁺ ions in the large linear ranges of 0.025–1.000 μM, 0.3–10.0 μM and 0.6–10.0 μM with limits of detection that are 2.0 × 10⁻¹⁰ M, 1.92 × 10⁻⁷ M and 3.81 × 10⁻⁷ M, respectively. The fabricated sensor also shows high reliability and good selectivity. This MIL-88B(Fe)-NH₂ application strategy is promising for the evaluation of various heavy metal ions in water.

中文翻译：

MIL-88B(Fe)-NH2：胺功能化金属有机框架，适用于 Cd2+、Pb2+ 和 Cu2+ 离子检测的灵敏电化学传感器

_{我们在此提出了一种基于 MIL-88B(Fe)-NH 2}的水中多重金属离子检测的电化学平台，MIL-88B(Fe)-NH 2 是一种胺功能金属有机框架 (MOF)，用于修饰玻碳电极 (GCE) 表面。在此，具有丰富的官能化胺基的MIL-88B(Fe)-NH _{2可以在电化学氧化传感之前起到富集金属离子的捕获位点的作用。}采用溶剂热法在优化条件下合成了MIL-88B(Fe)-NH ₂，并通过X射线衍射(XRD)、扫描电子显微镜(SEM)、过渡电子显微镜(TEM)、傅里叶变换红外光谱(FT)进行表征。 -IR）、循环伏安法（CV）和电化学阻抗谱（EIS）技术。然后将MIL-88B(Fe)-NH ₂滴铸在GCE上，通过微分脉冲伏安法(DPV)电化学测定Cd ²⁺、Pb ²⁺和Cu ^{2+离子浓度。}该电化学传感器在0.025–1.000 μM、0.3–10.0 μM和0.6–10.0 μM的大线性范围内对Cd ²⁺、Pb ²⁺和Cu ²⁺离子表现出优异的电化学性能，检测限为2.0 × 10 ^{−分别为10} M、1.92 × 10 ^-7 M 和3.81 × 10 ^-7 M。所制造的传感器还表现出高可靠性和良好的选择性。这种MIL-88B(Fe)-NH ₂应用策略有望用于评估水中的各种重金属离子。

更新日期：2023-07-19

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