Liu Yang,Yu-Long Liu,Xian-Xian Ji,Cheng-Guo Liu,Ying Fu,Fei Ye
Background A novel luminescent sensor with dual-emitting platforms, Tb@UiO-66 , was used for highly detecting Sm 3+ and teflubenzuron. Methods Tb@UiO-66 was synthesized on basis of the exchange of guest molecules, where Tb 3+ ions were encapsulated into the cages of UiO-66 . Significant finds The results of multiband fluorescence originated from the linker-to-cluster charge transfer and the characteristic emission of Tb III . Tb@UiO-66 displayed luminescence enhancements or quenches according to small molecules. Especially for Sm 3+ and teflubenzuron, the characteristic peaks of Tb@UiO-66 at 490, 545, 585, and 621 nm increased with the increasing of the concentration of the analytes, where Tb@UiO-66 exhibited the effect of luminescence enhancement. The detection limits for detecting Sm 3+ and teflubenzuron were 0.09 μM and 0.21 μM, and the changes of luminescence intensities could be observed by naked eyes under the UV light at 365 nm. Tb@UiO-66 could also be used to detect teflubenzuron in real water samples. Tb@UiO-66 could be reused for at least 5 cycles for the detection of Sm 3+ and teflubenzuron with the framework of Tb@UiO-66 uncollapsed. These results implied that the integration of Ln III luminescent materials and Zr-MOFs by doping method provided a new strategy for fabricating novel luminescent sensors for detecting polluting small molecules.
As dairy consumption increases, antibiotic residues in milk pose a serious threat to public health. Developing simple, rapid, and highly sensitive detection technologies is crucial for ensuring food safety. In this study, a novel fluorescent sensor, Tb/UiO-66, was synthesized by coordinating terephthalic acid ligands with terbium and zirconium ions (Tb 3 + /Zr 4+ ). This sensor enables ratiometric fluorescent detection of tetracycline (TC), exhibiting characteristic emission peaks at 394 nm, 490 nm, and 594 nm. TC quenches the emission of UiO-66 at 394 nm via the inner filter effect (IFE) and quenches the fluorescence at 490 nm through coordination with Tb 3+ . The sensor, based on the F 394 /F 490 ratio, achieves a linear range of 10–90 μg/mL and a detection limit of (LOD)0.097 μg/mL (3σ). In real milk samples, recovery rates ranged from 95.87 % to 102.44 %, with a relative standard deviation below 2.88 %. This fluorescent sensor features a simple design, rapid response, and high sensitivity, establishing a reliable platform for assessing antibiotic contamination in food safety.
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