In the present study, the novel gelatin/sodium triphosphate hydrogel nanofiber mat (GT/STP HNFM) was fabricated using the electrospinning strategy. Owing to the formation of ionic complex between STP and GT, the water stability of synthesized nanofiber increased, thereafter, the synthesized water-insoluble nanofiber was applied as a novel nanosorbent in microextraction in packed syringe (MEPS) method, using for the preconcentration of La³⁺ and Tb³⁺ in environmental and industrial water samples to the detection of them by an inductively coupled plasma optical emission spectroscopy (ICP-OES). The characterization of nanosorbent was performed and the effect of main parameters on adsorption performance were investigated. Under the optimum condition, the method showed a good linearity ranging from 1 to 500 ng mL⁻¹ with a correlation coefficient superior to 0.998. Additionally, the low detection limits (0.1–0.2 ng mL⁻¹) revealed good sensitivity of the proposed method. Finally, the MESP-ICP-OES method was applied for the determination of La³⁺ and Tb³⁺ in environmental and industrial water samples with relative recoveries (RRs) ranging from 85 to 102% and relative standard deviations (RSDs) lower than 2.7%. The outcome of this study revealed an effective method for the extraction and recovery of La³⁺ and Tb³⁺ from aqueous solutions using a non-toxic, inexpensive, and efficient nanosorbent.

在本研究中，使用电纺丝策略制备了新型明胶/三磷酸钠水凝胶纳米纤维垫（GT / STP HNFM）。由于STP和GT之间形成了离子络合物，提高了合成纳米纤维的水稳定性，此后，将合成的水不溶性纳米纤维作为新型纳米吸附剂用于装填注射器的微萃取中，用于La的预浓缩。³⁺和Tb ³⁺可以通过电感耦合等离子体发射光谱法（ICP-OES）检测环境和工业用水中的样品。进行了纳米吸附剂的表征，研究了主要参数对吸附性能的影响。在最佳条件下，该方法显示出良好的线性，范围为1至500 ng mL ^-1，相关系数优于0.998。此外，低检测限（0.1–0.2 ng mL ^-1）显示了所提出方法的良好灵敏度。最后，采用MESP-ICP-OES法测定La ³⁺和Tb ^3+。在环境和工业用水样品中的相对回收率（RRs）在85至102％之间，相对标准偏差（RSDs）低于2.7％。这项研究的结果揭示了一种使用无毒，廉价和有效的纳米吸附剂从水溶液中提取和回收La ³⁺和Tb ³⁺的有效方法。