Based on bimetallic FeCo MOFs electrochemical sensor with a low detection limit for trace copper ions detection

IF 2.5 Q2 CHEMISTRY, MULTIDISCIPLINARY

Results in Chemistry Pub Date : 2025-04-14 DOI:10.1016/j.rechem.2025.102266

Ruiying Zhu , Lifeng Ding , Qiang Li , Hongmei Dong , Mengjie Shi , Zhengwei Song , Shengling Li , Hao Chen , Jiahang Zhang

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Abstract

Environmental contamination by heavy metal ions poses significant health risks, emphasizing the urgent need for effective detection methods. In the work, it develops a bimetallic FeCo MOFs electrochemical sensor for trace copper ions detection in water, using a NaOH-mediated synthesis to modify MOFs materials. Iron ion doping introduces a bimetallic site, significantly enhancing the conductivity of the original ZIF-67. The addition of reduced graphene oxide (RGO) further improves conductivity due to its folded structure, which facilitates greater MOF deposition on the electrode surface. Additionally, the incorporation of Nafion enhances the stability of the MOF in aqueous environments. Sensitivity tests show effective detection of Cu²⁺ in the concentration range of 0.01–1 μM, with a LOD of 6.54 nM. And the sensor has exceptional stability, reproducibility, and interference resistance. The sensor demonstrated successful application in detecting Cu²⁺ in water samples, showing potential for broader applications in monitoring other heavy metal ions in environmental water samples.

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基于低检出限双金属FeCo - MOFs电化学传感器的痕量铜离子检测

重金属离子污染环境对人体健康构成重大威胁，迫切需要有效的检测方法。在这项工作中，它开发了一种双金属FeCo MOFs电化学传感器，用于水中痕量铜离子的检测，使用naoh介导的合成来修饰MOFs材料。铁离子掺杂引入双金属位点，显著提高了原ZIF-67的导电性。还原氧化石墨烯（RGO）的加入由于其折叠结构进一步提高了电导率，这有利于在电极表面沉积更多的MOF。此外，Nafion的加入提高了MOF在水环境中的稳定性。灵敏度测试表明，该方法在0.01 ~ 1 μM的浓度范围内有效检测Cu2+，检出限为6.54 nM。该传感器具有优异的稳定性、可重复性和抗干扰性。该传感器已成功应用于检测水样中的Cu2+，显示出在监测环境水样中其他重金属离子方面的更广泛应用潜力。

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