Three fluorescent probes based on Cd-MOFs for highly selective, sensitive and stable detection of antibiotics, anions and cations in water

It is essential to explore methods for detecting environmental pollutants to address the issue of pollution. Three novel Cd-based MOFs fluorescent sensors, namely [Cd1.5(TPT)0.5(BTC)H2O·DMF] (CUST-541), [Cd(TPT)(5-NTPA)·H2O] (CUST-542), and [Cd1.5(TPTZ)1.5(BTC)H2O·H2O] (CUST-543) (TPTZ = 2,4,6-Tris(2-pyridyl)-1,3,5-triazine; H3BTC = Trimesic acid; 5-NTPA = 5-Nitroisophthalic acid; TPT = 2,4,6-tri-4-pyridyl-1,3,5-triazine) were successfully compounded under solvent thermal conditions. Single-crystal X-ray diffraction analyses revealed that the crystal structures of CUST-541 and CUST-542 were found to have similar C2/c space group, while CUST-543 was in the monoclinic system with the P2/c space group. We have tested different types of antibiotics, cations, and anions, and found that the MOFs have very low LOD for NFT, Cu2+, and CrO42-. The LODs of NFT, Cu2+, and CrO42- for crystals are 0.53μM, 0.38μM, and 2.36μM, respectively. Furthermore, this method is characterized by its low detection limit, rapid response time, wide linear range, and reproducible luminescence sensitivity.