Lead ion (Pb(II)) has emerged as a major mussel pollutant in recent decades, thus the development of sensors capable of detecting Pb(II) is of considerable interest. In this work, a novel, rapid, and “turn-on” phosphorescent sensor was developed to monitor Pb(II) using metal-organic framework-5 (MOF-5, Zn₄O(TPA)₃, TPA: terephthalic acid) as a highly selective and sensitive luminescent probe. A mechanism describing the leaching of Zn(II) from Zn₄O complexes and self-assembly of TPA after Pb(II) coordination is proposed for the MOF-5-Pb(II) system. Using enhanced phosphorescence, the sensor displays a wide linear detection range of 0.01-10 μmol/L and a low detection limit of 2 nmol/L for the determination of Pb(II). Moreover, it is noteworthy that when immobilized in a polyethylene glycol (PEG) film, the MOF-5 probe exhibited a visually distinct color change at 1.0 μmol/L Pb(II) under 365 nm UV light. From these results, a test strip was prepared for semi-quantitative analysis of Pb(II) content. Finally, the proposed phosphorescent sensor was successfully utilized to detect Pb(II) content in mussel. This study demonstrates the first MOF-based “turn-on” phosphorescent sensor for monitoring Pb(II), from which future high-performance phosphorescent sensors to determine food pollutants may be developed.

铅离子（Pb（II））在近几十年来已成为一种主要的贻贝污染物，因此，能够检测Pb（II）的传感器的发展引起了人们的极大兴趣。在这项工作中，开发了一种新颖，快速且“开启”的磷光传感器，以使用金属有机骨架5（MOF-5，Zn ₄ O（TPA）₃，TPA：对苯二甲酸）来监测Pb（II ）。作为高度选择性和灵敏的发光探针。描述从Zn _4中浸出Zn（II）的机理针对MOF-5-Pb（II）系统，提出了Pb（II）配位后TPA的O配合物和自组装。使用增强的磷光，该传感器可显示0.01-10μmol/ L的宽线性检测范围和2 nmol / L的低检测限，用于测定Pb（II）。此外，值得注意的是，当固定在聚乙二醇（PEG）膜中时，MOF-5探针在365 nm紫外线下在1.0μmol/ L Pb（II）上表现出视觉上明显的颜色变化。根据这些结果，准备了一个试纸用于Pb（II）含量的半定量分析。最后，所提出的磷光传感器被成功地用于检测贻贝中的Pb（II）含量。这项研究演示了第一个基于MOF的“开启”磷光传感器，用于监测Pb（II），