Multifunctional Lanthanide Metal-Organic Frameworks Based on -NH Modified Ligand: Fluorescent Ratio Probe, CrO Ions Adsorption, and Photocatalytic Property.

In response to the growing concern for environmental pollution, two lanthanide compounds {[Ln(L)(HO)]·4HO} (where Ln = Tb and Gd, HL = 1-amino-2,4,6-benzene tricarboxylic acid) were synthesized using a -NH modified ligand and systematically characterized. Both compounds exhibit remarkable fluorescence response, adsorption of CrO ions, and photocatalytic degradation properties, as well as exceptional acid-base and thermal stability. Remarkably, the pH-dependent exhibits exceptional performance as a fluorescent probe for detecting Fe and CrO/CrO ions in aqueous solutions, while also serving as a ratiometric fluorescent probe for the detection of Cr, offering rapid response, high sensitivity, selectivity, and recoverability advantages in application. Moreover, exhibits excellent detection capabilities and displays effective adsorption of CrO ions, with a maximum adsorption capacity of 230.71 mg/g. On the other hand, exhibits superior performance compared to in the photocatalytic degradation of antibiotics. The degradation mechanism is further elucidated by conducting experiments with DFT theoretical calculations.