Ratio Fluorescence Sensor Based on Bimetal MOFs for the Detection of Hg²⁺and H₂O₂

In this work, a dual-emission material based on lanthanide metals was synthesized and used as a ratio fluorescence sensor to respond to Hg²⁺ and H₂O₂, respectively. Tb-BDC-NH₂ as a bimetal MOFs had double ligands and exhibited double fluorescence emission peaks at 550 nm and 450 nm. The two emission peaks of Tb-BDC-NH₂ can be quenched by Hg²⁺ and H₂O₂ respectively, forming a built-in calibration signal for ratio fluorescence detection. Based on the different detection conditions of the Hg²⁺ and H₂O₂, the simultaneous detection of the two detection substances can be achieved with simple operation. This detection system had good stability and anti-interference ability. Under optimal conditions, the detection limit for Hg²⁺ detection was 0.2 µM. Meanwhile, for the detection of H₂O₂, the detection limit was 11 µM and large linear ranges were obtained. Through actual sample testing, it had been proven that the ratio fluorescence sensor based on Tb-BDC-NH₂ had good application prospects. And the work also provided a new idea for double substances detection.