Shao Zhiying, Di Kezuo, Ding Lijun, You Fuheng, Fan Cunhao, Wang Kun
School of Agricultural Engineering, Jiangsu University, 212013, Zhenjiang, PR China.
School of Chemistry and Chemical Engineering, Jiangsu University, 212013, Zhenjiang, PR China.
Anal Chim Acta. 2025 Jan 2;1333:343408. doi: 10.1016/j.aca.2024.343408. Epub 2024 Nov 6.
Heavy metal pollution is a global environmental problem. Self-reduction strategy has garnered attention in adsorption and electrochemical detection of heavy metal ions due to their operational simplicity and elimination of the need for external electrodeposition steps. Therefore, it is crucial to integrate self-reduction-based adsorption with electrochemical detection. Metal-Organic Frameworks (MOFs) have demonstrated successful applications in adsorption and electrochemical detection. Moreover, owing to the presence of organic ligands featuring amino and electron-rich aromatic ring moieties, MOFs possess reducing capabilities towards metal ions.
Herein, 2,4,6-triaminopyrimidine, characterized by its abundance of amino and electron-rich aromatic ring constituents, was selected as the organic ligand for the synthesis of Zn-MOFs, showcasing their efficacy in self-reduction-based adsorption and electrochemical detection of heavy metal ions. The Zn-MOFs exhibited swift uptake of heavy metal ions, boasting a remarkable adsorption capacity (4624 mg/g for Cu(II), 4261 mg/g for Hg(II), and 4874 mg/g for Pb(II)), while also exhibiting low detection limits (0.17 μg/L for Cu(II), 0.25 μg/L for Hg(II), and 0.22 μg/L for Pb(II)) in the electrochemical detection of heavy metal ions.
In this work, amino-rich Zn-MOFs were prepared for self-reducing adsorption and electrochemical detection of heavy metal ions, providing promising material for the detection and removal of heavy metal ions, offering a new method for the effective elimination and rapid detection of heavy metal ions, and pointing out a promising path for the treatment and monitoring of environmental issues.
重金属污染是一个全球性的环境问题。自还原策略因其操作简单且无需外部电沉积步骤，在重金属离子的吸附和电化学检测中受到关注。因此，将基于自还原的吸附与电化学检测相结合至关重要。金属有机框架材料（MOFs）已在吸附和电化学检测中展现出成功的应用。此外，由于存在具有氨基和富电子芳香环部分的有机配体，MOFs对金属离子具有还原能力。
在此，以富含氨基和富电子芳香环成分的2,4,6-三氨基嘧啶为有机配体合成了Zn-MOFs，展示了其在基于自还原的重金属离子吸附和电化学检测中的功效。Zn-MOFs对重金属离子具有快速的吸附能力，具有显著的吸附容量（对Cu(II)为4624 mg/g，对Hg(II)为4261 mg/g，对Pb(II)为4874 mg/g），同时在重金属离子的电化学检测中也表现出低检测限（对Cu(II)为0.17 μg/L，对Hg(II)为0.25 μg/L，对Pb(II)为0.22 μg/L）。
本工作制备了富含氨基的Zn-MOFs用于重金属离子的自还原吸附和电化学检测，为重金属离子的检测和去除提供了有前景的材料，为有效消除和快速检测重金属离子提供了新方法，并为环境问题的处理和监测指出了一条有前景的道路。
