Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, Key Laboratory of Analytical Chemistry for Life Science in Universities of Shandong, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
Xinjiang Blue Ridge Tunhe Degradable Materials Co., Ltd., Changji 831100, China.
Anal Methods. 2023 Mar 16;15(11):1452-1460. doi: 10.1039/d3ay00009e.
Metal-organic framework (MOF) materials exhibit unique advantages in adsorption, pre-enrichment and selective recognition of heavy metal ions due to their porous nature, tunable structure and ease of functionalization. However, due to the poor conductivity and electrochemical activity of most MOFs, their application in electrochemical sensing is limited. In this paper, an electroactive hybrid material rGO/UiO-bpy composed of UiO-bpy and electrochemically reduced graphene oxide (rGO) was prepared and has been successfully used in the electrochemical determination of lead ions (Pb). Interestingly, a reverse response relationship between the electrochemical signal of UiO-bpy and the concentration of Pb was discovered in the experiment, which can be used to develop a novel on-off ratiometric sensing strategy for Pb detection. To our knowledge, this is the first time that UiO-bpy has been used as both an improved electrode material for heavy metal ion detection and an internal reference probe for ratiometric analysis. This study is of great significance to expand the electrochemical application of UiO-bpy and develop innovative electrochemical ratiometric sensing strategies for Pb determination.
金属-有机骨架（MOF）材料由于其多孔性、可调节的结构和易于功能化，在重金属离子的吸附、预富集和选择性识别方面表现出独特的优势。然而，由于大多数 MOF 的导电性和电化学活性较差，其在电化学传感中的应用受到限制。本文制备了一种由 UiO-bpy 和电化学还原氧化石墨烯（rGO）组成的电活性杂化材料 rGO/UiO-bpy，并成功地用于铅离子（Pb）的电化学测定。有趣的是，实验中发现 UiO-bpy 的电化学信号与 Pb 浓度之间存在反向响应关系，可用于开发用于 Pb 检测的新型开-关比率传感策略。据我们所知，这是首次将 UiO-bpy 既用作重金属离子检测的改进电极材料，又用作比率分析的内部参考探针。这项研究对于扩展 UiO-bpy 的电化学应用和开发用于 Pb 测定的创新电化学比率传感策略具有重要意义。
