Affiliation:
1. The Third Geological Center Laboratory China Metallurgical Geology Bureau Taiyuan 030002 P. R. China
2. College of Chemistry Beijing University of Chemical Technology Beijing 100029 P. R. China
Abstract
AbstractLead ion (Pb2+) is a high‐hazardously heavy metal ion in surroundings that even ppb level can cause mental decline and behavioral difficulties especially in children. However, the recognition and detection of Pb2+ are still challenging. Here, a high selective and ultra‐sensitive chemiluminescence (CL) method was established based on the substitution mechanism between Pb2+ and the metal–organic framework – Cu‐MOF‐74. Pb2+ can specifically substitute Cu active sites in Cu‐MOF‐74 and released Cu sites, strongly amplifying the CL emission of the luminol‐hydrogen peroxide (H2O2) system. A linear response for Pb2+ detection in the range of 0.5–50 nM with a detection limit of 0.3 nM was realized. Moreover, the proposed method was successfully implemented on a paper‐based analytical device with favorable fabrication and operational features for Pb2+ determination in water samples. It offers a new strategy to design high selective and sensitive sensors for the heavy metal ions monitoring.