Eu³⁺ ions were grafted onto the surface of electrospun polyacrylonitrile (PAN) nanofibers through coordination effect between CN groups on PAN nanofibers and Eu³⁺ ions, and benzoic acid (BA) was introduced as an assistant ligand. The impacts of concentrations of Eu³⁺ ions and BA, and reaction time on the properties of final products were investigated. The results reveal that Eu³⁺ ions can be successfully grafted onto PAN nanofibers, but the fluorescence intensity of the obtained PAN@Eu³⁺ nanofibers is very weak. After BA is introduced as the assistant ligand, the fluorescence intensity of the obtained PAN@(Eu³⁺/BA) nanofibers is greatly stronger than that of PAN@Eu³⁺ nanofibers, and meanwhile, concentration quenching effect of Eu³⁺ ions can be effectively restrained. Furthermore, the superior structure of PAN@(Eu³⁺/BA) nanofibers not only brings the effective utilization of precious elemental europium, but also guarantees high mechanical strength.

Eu ³⁺离子通过PAN纳米纤维上C N 基团与Eu ³⁺离子的配位作用接枝到电纺聚丙烯腈（PAN）纳米纤维表面，并引入苯甲酸（BA）作为辅助配体。^{研究了Eu 3+}离子和BA的浓度以及反应时间对最终产物性能的影响。结果表明，Eu ³⁺离子可以成功接枝到PAN纳米纤维上，但得到的PAN@Eu ³⁺纳米纤维的荧光强度很弱。引入BA作为辅助配体后，所得PAN@(Eu ³⁺ /BA)纳米纤维的荧光强度大大强于PAN@Eu³⁺纳米纤维，同时可以有效抑制Eu ^{3+离子的浓度猝灭效应。}此外，PAN@(Eu ³⁺ /BA)纳米纤维的优越结构不仅带来了贵重元素铕的有效利用，而且保证了较高的机械强度。