Monolithic graphene fibers for solid-phase microextraction.
Monolithic graphene fibers for solid-phase microextraction.
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DOI：
10.1016/j.chroma.2013.10.065
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发表时间：
2013-12
期刊：
影响因子：
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通讯作者：
Jing Fan;Z. Dong;M. Qi;R. Fu;L. Qu
中科院分区：
文献类型：
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作者：
Jing Fan;Z. Dong;M. Qi;R. Fu;L. Qu
通过尺寸限制的水热策略制造了用于固相微萃取（SPME）的整体石墨烯纤维，并评估了它们的萃取性能。在纤维制造中，创新性地使用玻璃管道作为水热反应器，而不是特氟龙内衬高压釜。与传统的固相微萃取纤维方法相比，该策略可以一次制造长达数米甚至更长的均匀石墨烯纤维。与毛细管气相色谱（GC）相结合，由于π-π堆积相互作用和疏水效应，直接浸没（DI）模式下的整体石墨烯纤维比正构烷烃实现了更高的芳烃萃取效率，特别是多环芳烃（PAH）。此外，该纤维表现出优异的耐用性，可重复使用 160 次以上，提取性能不会显着损失。因此，最终采用 20% NaCl (w/w) 40 °C 50 分钟的最佳萃取条件对水样中的 PAH 进行固相微萃取。对于水样中 PAH 的测定，所提出的 DI-SPME-GC 方法的线性范围为 0.05–200 μg/L，检测限 (LOD) 为 4.0–50 ng/L，相对标准偏差 (RSD) 对于一种纤维和不同纤维分别小于 9.4% 和 12.1%，回收率为 78.9–115.9%。该方法可用于环境水样中PAHs的分析。
Monolithic graphene fibers for solid-phase microextraction (SPME) were fabricated through a dimensionally confined hydrothermal strategy and their extraction performance was evaluated. For the fiber fabrication, a glass pipeline was innovatively used as a hydrothermal reactor instead of a Teflon-lined autoclave. Compared with conventional methods for SPME fibers, the proposed strategy can fabricate a uniform graphene fiber as long as several meters or more at a time. Coupled to capillary gas chromatography (GC), the monolithic graphene fibers in a direct-immersion (DI) mode achieved higher extraction efficiencies for aromatics than those forn-alkanes, especially for polycyclic aromatic hydrocarbons (PAHs), thanks to π–π stacking interaction and hydrophobic effect. Additionally, the fibers exhibited excellent durability and can be repetitively used more than 160 times without significant loss of extraction performance. As a result, an optimum extraction condition of 40 °C for 50 min with 20% NaCl (w/w) was finally used for SPME of PAHs in aqueous samples. For the determination of PAHs in water samples, the proposed DI-SPME-GC method exhibited linear range of 0.05–200 μg/L, limits of detection (LOD) of 4.0–50 ng/L, relative standard deviation (RSD) less than 9.4% and 12.1% for one fiber and different fibers, respectively, and recoveries of 78.9–115.9%. The proposed method can be used for analysis of PAHs in environmental water samples.