期刊
ANALYTICA CHIMICA ACTA
卷 1095, 期 -, 页码 99-108出版社
ELSEVIER
DOI: 10.1016/j.aca.2019.10.023
关键词
Nitrogen-doped carbon nanotube cages; Solid-phase microextraction; Gas chromatography-mass spectrometry; Polychlorinated biphenyls
资金
- National Natural Science Foundation of China of China [21575028, 21705026]
- Nature Sciences Funding of Fujian Province [2016J01051]
- Program for Changjiang Scholars and Innovative Research Team in University, China [IRT15R11]
- Collaborative Innovation Center of Chinese Oolong Tea Industry-Collaborative Innovation Center (2011) of Fujian Province
An efficient and stable adsorbent is of critical importance for solid-phase microextraction (SPME). In this study, we prepared metal-organic framework-derived nitrogen (N)-doped carbon (C) nanotube cages (N-CNTCs) with unique N-doped active sites and C-rich nanotubes to coat SPME adsorbents. This new material was obtained via a simple thermal treatment with ZIF-67, and exhibited high porosity and excellent chemical and thermal stability. Compared with commercial fibers and traditional C nanotubes-coated fiber (15 nm), N-CNTC-coated fiber exhibited better extraction properties, mainly due to its pi-pi interactions, abundant active sites, and hollow cage structure, which is composed of interconnected crystalline N-doped C nanotubes. N-CNTC-coated fiber exhibited better extraction performance and shorter extraction equilibrium time than the solid N-doped C-coated fiber due to its hollow cage structure. The N-CNTC-coated fiber was then used to identify polychlorinated biphenyls (PCBs) with wide linear range (0.3-1000.0 ng L-1), low limits of detection (0.10-0.22 ng L-1), good repeatability (intra-day, 2.6-3.8%; inter-day, 3.3-4.8%), and good reproducibility (<8.6%). We then successfully applied the N-CNTC-coated fiber to detect PCBs in river water samples from six cities in Fujian Province and obtained satisfactory recovery levels. Thus, the novel N-CNTCs coating proposed in this study is a promising candidate for SPME coating. (C) 2019 Elsevier B.V. All rights reserved.
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