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 = Tb3+ and Eu3+) were synthesized from 1,3,5-tri(4-carboxyphenyl)benzene (H3L) and Ln3+ by the solvothermal method for the first time. A series of 1-EuxTb1-x with different luminescence were doped by changing the molar ratio of Tb3+ and Eu3+. Ln3+ forms a 4-connected 2D network structure through self-assembly with fully deprotonated L3-. 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.