Key Lab of Aerospace Structural Parts Forming Technology and Equipment of Anhui Province, Institute of Industry and Equipment Technology, Hefei University of Technology, Hefei 230009, PR China; School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, PR China.
Key Lab of Aerospace Structural Parts Forming Technology and Equipment of Anhui Province, Institute of Industry and Equipment Technology, Hefei University of Technology, Hefei 230009, PR China.
J Hazard Mater. 2022 Jun 5;431:128608. doi: 10.1016/j.jhazmat.2022.128608. Epub 2022 Mar 1.
Mercury readily methylates to form extremely toxic methylmercury (CHHg) that seriously imparts central nervous systems' functionality in humans and animals. Therefore, the development of rapid CHHg determination methods for the detection of environmentally relevant concentrations is a research priority. We developed an electrochemical technique to detect CHHg with minimal sample preparations, cost-effectively. Gold nanoparticles (AuNPs) were synthesized on metal-organic frameworks (MOFs) in a facile way using potassium borohydride as a reductant. An electrochemical sensor was developed using Au nanoparticles and zeolitic imidazolate framework-67 (Au/ZIF67) modified glassy carbon electrode (Au/ZIF67 GCE) for the determination of CHHg. The linear stripping current responses were ranging from 1 µg/L to 25 µg/L [CHHg], with 0.571 µA/µgL sensitivity and 0.05 µg/L detection limit. The outstanding performance of Au/ZIF67 modified GCE for CHHg detection might be attributed to the unique hollow structure and active Co sites of the ZIF67 skeleton and catalytic activity of AuNPs. The new electrochemical sensor shows good stability and no interference by metal ions in the matrix. The Au/ZIF67 modified GCE sensor shows a good promise in detecting CHHg in natural water.
汞很容易甲基化形成极毒的甲基汞（CHHg），严重损害人类和动物的中枢神经系统功能。因此，开发快速测定环境相关浓度的 CHHg 方法是研究重点。我们开发了一种电化学技术，可通过最小的样品制备、经济高效地检测 CHHg。使用硼氢化钾作为还原剂，在金属有机骨架（MOFs）上简便地合成了金纳米粒子（AuNPs）。使用 Au 纳米粒子和沸石咪唑骨架-67（Au/ZIF67）修饰的玻碳电极（Au/ZIF67 GCE）开发了电化学传感器，用于测定 CHHg。线性剥离电流响应范围为 1μg/L 至 25μg/L [CHHg]，灵敏度为 0.571μA/μgL，检测限为 0.05μg/L。Au/ZIF67 修饰的 GCE 对 CHHg 检测的出色性能可能归因于 ZIF67 骨架的独特空心结构和活性 Co 位以及 AuNPs 的催化活性。新型电化学传感器在检测天然水中的 CHHg 时表现出良好的稳定性和对基体中金属离子的无干扰性。Au/ZIF67 修饰的 GCE 传感器在检测 CHHg 方面具有良好的应用前景。
