A turn-on fluorescence sensing strategy for rapid detection of flumequine in water environments using covalent-coordination functionalized MOFs

Abstract

With the high output and large use of antibiotics in the process of aquaculture, pollution caused by antibiotics in water environments is becoming a thorny problem, and its ecological risk has aroused widespread concern. In this work, the lanthanide hybrid material Eu@ZIF-90–PA is synthesized by a two-step post synthesis strategy using ZIF-90 with a modifiable group as a parent skeleton. Owing to its luminescence properties and water stability, the lanthanide functionalized material can be utilized as a novel “turn-on” fluorescent probe for quantitative detection of flumequine in water environments. Additionally, the probe can not only be reused, but also quickly respond to flumequine within 30 s and the detection limit is 0.24 ppm. Even in the complex river water, the probe still exhibits an obvious luminescence enhancement effect with flumequine, which provides an efficient and convenient method for the detection of flumequine in real water. Finally, the fluorescence enhancement mechanism between flumequine and the probe is further explored.