A metal-organic framework MIL-53(Fe) was successfully synthesized by a simple hydrothermal method. A synthesized MIL-53(Fe) sample was characterized, and results indicated that the formed MIL-53(Fe) was a single phase with small particle size of 0.8 μm and homogeneous particle size distribution was obtained. The synthesized MIL-53(Fe) has been used to modify a glassy carbon electrode (GCE) by a drop-casting technique. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) measurements of the MIL-53(Fe)-modified GCE showed that the MIL-53(Fe) was successfully immobilized onto the GCE electrode surface and the electrochemical behavior of the GCE/MIL-53(Fe) electrode was stable. In addition, several electrochemical parameters of MIL-53(Fe)-modified GCE (GCE/MIL-53(Fe)) including the heterogeneous standard rate constant ( ) and the electrochemically effective surface area ( ) were calculated. Obtained results demonstrated that the synthesized MIL-53(Fe) with the small particle size, highly homogeneous particle size, and high electrochemically effective surface area was able to significantly enhance the electrochemical response signal of the working electrode. Therefore, the GCE/MIL-53(Fe) electrode has been used as a highly sensitive electrochemical sensor for cadmium ion (Cd(II)) monitoring in aqueous solution using differential pulse voltammetry (DPV) technique. The response signal of the electrochemical sensor increased linearly in the Cd(II) ion concentration range from 150 nM to 450 nM with the limit of detection (LOD) of 16 nM.

中文翻译：

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金属有机骨架 MIL-53(Fe)：合成、电化学表征以及在开发用于检测水溶液中镉离子的新型灵敏电化学传感器中的应用

通过简单的水热法成功合成了金属有机骨架 MIL-53(Fe)。对合成的 MIL-53(Fe) 样品进行表征，结果表明形成的 MIL-53(Fe) 为单相，粒径小至 0.8 μm，粒径分布均匀。合成的 MIL-53(Fe) 已用于通过滴铸技术对玻碳电极 (GCE) 进行改性。MIL-53(Fe) 修饰的 GCE 的循环伏安法 (CV) 和电化学阻抗谱 (EIS) 测量表明 MIL-53(Fe) 成功地固定在 GCE 电极表面和 GCE/MIL 的电化学行为-53(Fe) 电极稳定。此外，计算了 MIL-53(Fe) 修饰的 GCE (GCE/MIL-53(Fe)) 的几个电化学参数，包括异质标准速率常数 ( ) 和电化学有效表面积 ( )。所得结果表明，合成的 MIL-53(Fe) 具有小粒径、高度均匀的粒径和高电化学有效表面积，能够显着增强工作电极的电化学响应信号。因此，GCE/MIL-53(Fe) 电极已被用作使用差分脉冲伏安法 (DPV) 技术监测水溶液中镉离子 (Cd(II)) 的高灵敏度电化学传感器。电化学传感器的响应信号在 Cd(II) 离子浓度范围从 150 nM 到 450 nM 线性增加，检测限 (LOD) 为 16 nM。