Fang Yuanyuan, Zhou Fangzhou, Zhang Qian, Deng Chao, Wu Minying, Shen Hsin-Hui, Tang Yi, Wang Yajun
Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Laboratory of Advanced Materials and Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai, 200433, China.
College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325027, Zhejiang, PR China.
Talanta. 2024 Jan 15;267:125223. doi: 10.1016/j.talanta.2023.125223. Epub 2023 Sep 20.
The solid phase microextraction (SPME) technique has been widely applied in the detection of trace compounds in food, environment, and medicine due to its advantages of easy quantification, simple operation, and greenness. Herein, a templating strategy with SiO nanofibers (SiO NFs) is reported to synthesize hierarchical covalent organic framework hollow nanofibers (COF HNFs)-coated stainless steel fiber for SPME application with dramatically enhanced enrichment performance for trace analytes. The construction of hierarchical porosity inside the microextraction coatings can not only increase the specific surface area of COF extraction materials for obtaining more abundant adsorption sites but also greatly improve the accessibility of internal COF micropores. Moreover, the thicknesses of the microextraction COF coatings can be facilely tailored by adjusting the amount of SiO NFs pre-assembled on the SPME fibers. On the headspace solid phase microextraction (HS-SPME) of antimicrobial residues, the developed COF TpBD-Me HNFs-12 fibers achieve enrichment factors of 2026 and 1823 for thymol and carvacrol respectively, which are significantly higher than those obtained from the counterpart COF TpBD-Me-bonded fiber (8.5-8.2 times) and commercial CAR/PDMS fiber (3.3-4.4 times). Furthermore, the developed method was demonstrated to have wide linearity (0.1-50 μg L), low limits of detection (0.010 μg L), good thermal stability and excellent reusability (>60 recycles), demonstrating great application potential in the extraction of trace organic pollutants. The strategy developed in this work is applicable to preparing a variety of topological COF (e.g., TpBD, TpPa-1) HNFs-bonded fibers.
固相微萃取（SPME）技术因其易于定量、操作简单和绿色环保等优点，已广泛应用于食品、环境和医学中痕量化合物的检测。本文报道了一种以SiO纳米纤维（SiO NFs）为模板的策略，用于合成具有分级结构的共价有机框架中空纳米纤维（COF HNFs）包覆的不锈钢纤维，用于SPME应用，对痕量分析物具有显著增强的富集性能。微萃取涂层内部分级孔隙结构的构建不仅可以增加COF萃取材料的比表面积以获得更丰富的吸附位点，还可以大大提高内部COF微孔的可及性。此外，通过调整预组装在SPME纤维上的SiO NFs的量，可以轻松调整微萃取COF涂层的厚度。在抗微生物剂残留的顶空固相微萃取（HS-SPME）中，所制备的COF TpBD-Me HNFs-12纤维对百里香酚和香芹酚的富集因子分别达到2026和1823，显著高于相应的COF TpBD-Me键合纤维（8.5 - 8.2倍）和商用CAR/PDMS纤维（3.3 - 4.4倍）。此外，所开发的方法具有宽线性范围（0.1 - 50 μg L）、低检测限（0.010 μg L）、良好的热稳定性和出色的可重复使用性（>60次循环），在痕量有机污染物的萃取中显示出巨大的应用潜力。本工作中开发的策略适用于制备各种拓扑结构的COF（如TpBD、TpPa-1）HNFs键合纤维。
