Construction of Dual-Ligand Samarium(Iii)-Mof Fluorescent Sensor: An Efficient Platform for Selectivity Detection of Antibiotic Tetracycline

Abstract

The diffusing of antibiotic resistance in tetracycline (TC) is posing a serious threat to public health and safety of mankind. Therefore, accurately detecting the concentration of TC and analyzing the pollution degree is a crucial step in current detection of environmental pollution risks. However, it is still challenging to detect TC in water environment via portable and available approach. Herein, Sm-MOF that was made use of a series coordination and hydrogen bonds to be a 3D framework under solvothermal conditions employing both pyromellitic acid (H4BTEC) and nicotinic acid (HNTCA) as the main material. Obvious fluorescence quenching response was exhibited as selectively recognized TC via the Sm-MOF in the existing of diverse interferent. The experimental results certified Sm-MOF with great promise acting as sensor material in regard to TC which was embodied in glorious detection sensitivity (the limit of detection was up to 0.21 μM), anti-interference capability as well as circular availability. Furthermore, DFT theoretical calculations revealed that photoinduced electron transfer (PET) and internal filtration effect (IFE) were the main mechanism of the Sm-MOF fluorescence quenching for TC.

Keywords: Ln-MOFs, Fluorescent sensor, Antibiotic tetracycline detection, Photoinduced electron transfer (PET), Internal filtration effect (IFE)