Fabrication of the Antibiotic Sensor by the Multifunctional Stable Adjustable Luminescent Lanthanide Metal-Organic Frameworks.

In recent years, the irrational use of antibiotics has become very widespread. It is necessary to regulate this phenomenon through antibiotic detection. In this work, a series of isomorphic Ln-MOFs (Ln = Tb 3+ and Eu 3+ ) were synthesized from 1,3,5-tri(4-carboxyphenyl)benzene (H 3 L) and Ln 3+ by the solvothermal method for the first time. A series of 1-Eu x Tb 1- x with different luminescence were doped by changing the molar ratio of Tb 3+ and Eu 3+ . Ln 3+ forms a 4-connected 2D network structure through self-assembly with fully deprotonated L 3- . It shows good chemical stability in water, and its luminescence is not affected by aqueous solutions with different pH values. 1-Eu demonstrates rapid and sensitive detection capabilities for MDZ and TET with good recyclability and low detection limits (10 -5 ). In order to increase the practicability of 1-Eu , two portable sensors have been prepared, in which the fluorescent film ( Film@1-Eu ) has a detection limit of 10 -4 , and the sensitivity is only less than 10% of the titration results. A portable fluorescent test paper can reach the detection limit of 14.7 ppm. This study provides a new idea for the application of stable multifunctional materials in the field of fluorescence sensing.