Eu(III) functionalized Zr-based metal-organic framework as excellent fluorescent probe for Cd2+ detection in aqueous environment

A Eu-doped metal-organic framework (Uio-66-NH2-Eu) has been synthesized under a appropriate hydrothermal condition. Under UV-light irradiation, Uio-66-NH2-Eu shows blue luminescence which can be readily observed by naked eye. Uio-66-NH2-Eu shows excellent luminescence and good fluorescence stability in water which performs a remarkable enhancement effect (∼13 times as much as original one) in the luminescence emission of Eu3+ upon the introduction of Cd2+. Most importantly, the luminescence probe of Cd2+ shows a low detection limit (0.22 μM), a broad linear range (0.22-500 μM), fast detection time (<5 min), and the signals can be observed by the naked eyes under the irradiation of UV light of 365 nm.