基于Eu(TMA)phen的离子检测荧光探针OA

To address the limitations of existing heavy metal ions detection methods,such as cumbersome operation and bulky equipment,a rare-earth complex fluorescent probe capable of simultaneously detecting Fe3+and Cr3+with high sensitivity was developed.Using Eu3+as the luminescent center,1,3,5-benzenetricarboxylic acid(TMA)and phenanthroline(phen)as ligands,Eu(TMA)phen powders were prepared via the co-precipitation method.The morphology,structure,and optical properties of the powders were characterized by SEM,XRD,FT-IR,thermogravimetric analysis and fluorescence spectroscopy,and fluorescence sensing experiments were conducted to evaluate their detection performance for Fe3+and Cr3+.The results showed that the Eu(TMA)phen powders exhibited petal-like grains with good crystallinity.Eu3+formed stable coordination with the ligands,and the powders possessed excellent thermal stability,emitting Eu3+-characteristic red light under UV excitation.Fe3+caused overall fluorescence quenching of the powders,with a detection limit as low as 0.91 μmol/L.Cr3+changed the fluorescence color of the powders from red to light blue,which could be detected via the fluorescence peak ratio F468/F616,with a detection limit of 1.35 μmol/L.In addition,the powders had good stability in water,by only 3.5％decrease in fluorescence intensity after 2 d of immersion.Eu(TMA)phen powders have high selectivity and sensitivity for Fe3+and Cr3+,providing a new type of rare-earth complex material and a practical scheme for the detection of trace heavy metal ions.