期刊
JOURNAL OF SEPARATION SCIENCE
卷 43, 期 5, 页码 896-904出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.201900870
关键词
covalent organic frameworks; layer-by-layer self-assembly; polycyclic aromatic hydrocarbons; solid-phase microextraction
In this study, a new covalent organic framework, consisting of tetra(4-aminophenyl)porphyrin and tris(4-formyl phenyl)amine, was layer-by-layer immobilized on stainless-steel wire as a coating for microextraction. The fabrication process was easy and controllable under mild conditions. The as-grown fiber was applied to extract polycyclic aromatic hydrocarbons in aqueous solution via head-space solid-phase microextraction. Furthermore, it was analyzed by gas chromatography with a flame ionization detector. A wide linear range (0.1-50 mu g/L), low limits of detection (0.006-0.024 mu g/L, signal-to-noise ratio = 3), good repeatability (intra-fiber, n = 6, 3.1-8.50%), and reproducibility (fiber to fiber; n = 3, 5.79-9.98%), expressed as relative standard deviations, demonstrate the applicability of the newly developed coating. This new material was successfully utilized in real sample extraction with a satisfactory result. Potential parameters affecting the extraction efficiency, including extraction temperature and extraction time, salt concentration, agitation speed, sample volume, desorption temperature, and time, were also optimized and discussed.
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