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Luminescent Ln-MOFs (Eu 0.075 Tb 0.925 -MOF) were successfully synthesised through the solvothermal reaction of Tb(NO 3 ) 3 ·6H 2 O, Eu(NO 3 ) 3 ·6H 2 O, and the ligand pyromellitic acid. The product was characterised by X-ray diffraction (XRD), TG analysis, EM, X-ray photoelectron spectroscopy (XPS), and luminescence properties, and results show that the synthesised material Eu 0.075 Tb 0.925 -MOF has a selective ratio-based fluorescence response to Fe 3+  or Cr 2 O 7  2− . On the basis of the internal filtering effect, the fluorescence detection experiment shows that as the concentration of Fe 3+  or Cr 2 O 7  2−  increases, the intensity of the characteristic emission peak at 544 nm of Tb 3+  decreases, and the intensity of the characteristic emission peak at 653 nm of Eu 3+  increases in Eu 0.075 Tb 0.925 -MOF. The fluorescence intensity ratio (I 653 /I 544 ) has a good linear relationship with the target concentration. The detection linear range for Fe 3+  or Cr 2 O 7  2−  is 10–100 μM/L, and the detection limits are 2.71 × 10 −7  and 8.72 × 10 −7  M, respectively. Compared with the sensor material with a single fluorescence emission, the synthesised material has a higher anti-interference ability. The synthesised Eu 0.075 Tb 0.925 -MOF can be used as a highly selective and recyclable sensing material for Fe 3+  or Cr 2 O 7  2− . This material should be an excellent candidate for multifunctional sensors.

Preparation of Eu0.075Tb0.925-Metal Organic Framework as a Fluorescent Probe and Application in the Detection of Fe3+ and Cr2O72−