Post‐synthesis metal‐organic framework for turn‐on ratiometric fluorescence sensing of UO22+

Abstract Uranium is an important and toxic radioactive nuclide, which is usually exist in nature water as uranyl ions. In this work, we developed a rapid sensitive and selective analytical methods for detection uranyl ions in aqueous solution. The Eu 3+ incorporated MOF through post‐synthesis strategy was obtained, which exhibits excellent turn‐on and ratiometric fluorescence sensing ability toward uranyl ions with the limit of detection as low as 3 nM. Moreover, this probe also shows great selectivity towards uranyl ions in the presence of a wide range of environmentally interfering species and good sensing capacity in real water samples. We also discussed the sensing mechanism combine the XPS results and calculations.