A new dysprosium (III)-Organic framework as a ratiometric luminescent sensor for Nitro-compounds and antibiotics in aqueous solutions

Abstract

Effective detection of antibiotics and nitro-compounds is very important for human health and environmental protection. Here, a new 2D Dy-MOF {Dy-MOF = [Dy(L)(NO3) (DMF)3] n (H2L = 2,5-di(1H-1,2,4-triazol-1-yl) terephthalic acid, DMF = N, N-dimethylformamide)} was successfully prepared by solvothermal method with Dy (NO3)3·6H2O and 2, 5-di (1H-1,2,4-triazol-1-yl) terephthalic acid, and was further characterized by single crystal X-ray diffraction, powder X-ray diffraction (PXRD) and thermogravimetric analysis (TGA). The preparation of Dy-MOF with the multi-emission peaks can be used as a luminescent ratio sensor for nitro compounds and antibiotics. The detection limits of p-Nitrophenol, ONZ , MNZ , 2-MI are 0.0676, 0.0550, 0.0512 and 0.0398 μM respectively . The sensing mechanism is also discussed here, it is due to competitive absorption of excitation energies.