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Magnetic metal-organic frameworks nanocomposites for negligible-depletion solid-phase extraction of freely dissolved polyaromatic hydrocarbons
Li, Yingjie1; Zhou, Xiaoxia; Dong, Lijie; Lai, Yujian; Li, Shasha; Liu, Rui; Liu, Jingfu
2019-09-01
Source PublicationENVIRONMENTAL POLLUTION
ISSN0269-7491
Volume252Pages:1574-1581
AbstractThe bioavailability of a pollutant is usually evaluated based on its freely dissolved concentration (C-free), which can be measured by negligible-depletion equilibrium extraction that is commonly suffered from long equilibration time. Herein, metal-organic framework (MOF) composites (Fe3O4@MIL-101), consists of a magnetic Fe3O4 core and a MIL-101 (Cr) MOF shell, is developed as sorbents for negligible-depletion magnetic solid-phase extraction (nd-MSPE) of freely dissolved polyaromatic hydrocarbons (PAHs) in environmental waters. The freely dissolved PAHs in 1000 mL water samples are extracted with 1.5 mg MOF composites, and desorbed with 0.9 mL of acetonitrile under sonication for 5 min. The MOF composites exclude the extraction of dissolved organic matter (DOM) and DOM-associated PAHs by size exclusion. Additionally, the combined interactions (hydrophobic, pi-pi and pi-complexation) between PAHs and composites markedly reduced the extraction equilibration time to < 60 min for all the studied PAHs with logK(ow) up to 5.74. Moreover, the porous coordination polymers property of the MOFs makes the proposed nd-MSPE based on the partitioning of PAHs and thus excludes the competitive adsorption of coexisting substances. The developed nd-MSPE approach provides low detection limits (0.08 -0.82 ng L-1), wide linear range (1-1000 ng L-1) and high precision (relative standard deviations (RSDs) (3.3-4.8%) in determining C-free of PAHs. The measured C-free of PAHs in environmental waters are in good agreement with that of verified method. Given the large diversity in structure and pore size of MOFs, various magnetic MOFs can be fabricated for task-specific nd-MSPE of analytes, presenting a prospective strategy for high-efficiency measuring C-free of contaminants in environments. (C) 2019 Elsevier Ltd. All rights reserved.
Department环境化学与生态毒理学国家重点实验室
KeywordMetal-organic frameworks Negligible depletion extraction Restricted-access Environmental pollutants Freely dissolved concentration
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/42559
Collection环境化学与生态毒理学国家重点实验室
Affiliation1.Chinese Acad Sci, Ecoenvironm Sci Res Ctr, State Key Lab Environm Chem & Ecotoxicol, POB 2871, Beijing 100085, Peoples R China
2.Henan Polytech Univ, Coll Chem & Chem Engn, Jiaozuo 454000, Henan, Peoples R China
Recommended Citation
GB/T 7714
Li, Yingjie,Zhou, Xiaoxia,Dong, Lijie,et al. Magnetic metal-organic frameworks nanocomposites for negligible-depletion solid-phase extraction of freely dissolved polyaromatic hydrocarbons[J]. ENVIRONMENTAL POLLUTION,2019,252:1574-1581.
APA Li, Yingjie.,Zhou, Xiaoxia.,Dong, Lijie.,Lai, Yujian.,Li, Shasha.,...&Liu, Jingfu.(2019).Magnetic metal-organic frameworks nanocomposites for negligible-depletion solid-phase extraction of freely dissolved polyaromatic hydrocarbons.ENVIRONMENTAL POLLUTION,252,1574-1581.
MLA Li, Yingjie,et al."Magnetic metal-organic frameworks nanocomposites for negligible-depletion solid-phase extraction of freely dissolved polyaromatic hydrocarbons".ENVIRONMENTAL POLLUTION 252(2019):1574-1581.
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