Development of a novel (Eu (III) post-functionalized zirconium-based metal-organic framework) dual-emission ratiometric fluorescent probe for rapid and highly selective detection of Pb2+ and Cu2+

At present, with the development of society, different enterprises inevitably produce industrial wastewater and waste residue containing lead and copper. Therefore, there is an urgent need for a rapid and simple method to detect lead and copper in pollutants. In this paper, a metal-organic framework (MOF) doped with Eu(Ⅲ) (Eu 3+ /UiO-66-NH 2 ) was successfully prepared by one-pot hydrothermal technique. The probe is capable of detecting Pb 2+ and Cu 2+ with high sensitivity. Pb 2+ and Cu 2+ have detection ranges of 5–340 μM and 0.01–200 μM, respectively. The detection limit for Pb 2+ was as low as 1.01 μM, and the detection limit for Cu 2+ was 6.46 μM. This approach has a good detection performance when compared to the method described in the literature. It shows that the prepared sensor has great potential in the detection of actual lead and copper, and provides a practical and effective method for rapid and accurate detection of heavy metal ions. Scheme 1. Synthesis of Eu 3+ -UiO-66-NH 2 and detection of Pb 2 + and Cu 2+ • Using a one-pot technique, a metal-organic framework (MOF) doped with Eu 3+ (Eu 3+ /UiO-66-NH 2 ) was successfully created. • By modifying the structure and fluorescence properties of Eu 3+ /UiO-66-NH 2 , groups with specific recognition ability for Pb 2+ and Cu 2+ were introduced to realize the efficient detection of these two heavy metal ions. • The fluorescent probe exhibited excellent detection performance for Pb 2+ and Cu 2+ , with a good linear relationship in the concentration range of 5–340 μM and 0.01–200 μM. • The detection limit for Pb 2+ was as low as 1.01 μM, and the detection limit for Cu 2+ was 6.46 μM. • The probe can effectively distinguish Pb 2+ and Cu 2+ from other common metal ions, with good selectivity and anti-interference ability.