The construction of Tb doped Sr-BDC metal-organic framework materials and their high-sensitivity fluorescent detection of Fe.

This study presents the synthesis of a strontium-based metal-organic framework (Sr-BDC) through a solvothermal method, employing strontium chloride and terephthalic acid as primary precursors. The as-prepared Sr-BDC was subsequently functionalized with terbium ions (Tb) to yield a Tb@Sr-BDC composite. Extensive structural characterization, including X-ray diffraction (XRD), thermogravimetric analysis (TG), and the scanning electron microscope (SEM), confirmed that the Tb incorporation preserved the integrity of the Sr-MOF framework without inducing structural degradation. Photoluminescence analysis demonstrated that Tb@Sr-BDC exhibits distinct Tb emission peaks at 545 nm upon excitation at 294 nm, showcasing exceptional selectivity and sensitivity toward Fe ions. Stern-Volmer quenching analysis revealed a remarkably low detection limit of 7.3 × 10 mol L for Fe, with a linear response range spanning from 5 × 10 to 1 × 10 mol L. The potential mechanisms responsible for Fe-induced fluorescence quenching in Tb@Sr-BDC was also analysised in the study. These results underscore the potential of Tb@Sr-BDC as a highly efficient fluorescent probe for applications in environmental monitoring and biomedical sensing.