Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1681, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.chroma.2022.463459
Keywords
Metal-organic frameworks (MOFs); Multi-walled carbon nanotubes (MWCNTs); Magnetic solid-phase extraction (MSPE); High performance liquid chromatography (HPLC); Polycyclic aromatic hydrocarbons (PAHs)
Funding
- National Natural Science Foundation of China [21777129]
- National Natural Science Foundation of Gansu Province, China [20JR10RA081]
- Program for Innovative Research Group of Gansu Province, China [1210RJIA001]
- Special fund project for the central government [2020- 2060503-17]
- Industrial Support Plan of Education Department of Gansu Province [2021cyzc-01]
- Funds for Creative Research Groups of Gansu Province [21JR7RA160]
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In this study, a magnetic composite MIL-101(γ-Fe2O3)/MWCNTs was successfully synthesized and used as an adsorbent for enhanced and rapid enrichment of trace polycyclic aromatic hydrocarbons (PAHs). The adsorption process was well described by the pseudo-second-order kinetic model and Langmuir isotherm model. A sensitive detection method was established and showed wide linear range, low detection limits, and high enrichment factors for PAHs.
In this work, a magnetic MIL-101(gamma-Fe2O3)/MWCNTs composite derived from iron-based metal-organic frameworks (MIL-101(Fe)) with multi-walled carbon nanotubes (MWCNTs) was successfully synthesized by low-temperature calcination process. The composite was used as adsorbent of magnetic solid-phase extraction (MSPE) for enhanced and rapid enrichment of trace polycyclic aromatic hydrocarbons (PAHs) based on its strong pi-pi stacking interactions, hydrophobic and cationic-pi stacking interactions. The pseudo-second-order kinetic model and Langmuir isotherm model could be applied to better describe the adsorption process. The maximum adsorption capacity for PAHs reached 93.9 mg g(-1). In addition, the conditions of MSPE process were optimized by orthogonal array design (OAD). A MSPE-HPLC-UV method was established for the sensitive detection of PAHs in real water samples and exhibited wide linear range (0.05-10 0 0 mu g L-1), low detection limits (0.02-0.41 mu g L-1) and high enrichment factors (44-169) for PAHs. The relative standard deviations (RSD) ranged from 0.8 to 4.0% and 1.2-7.2% for single batch and batch-to-batch, respectively, and the spiked recoveries at two levels of 10 and 50 mu g L-1 ranged from 79.6 to 112% with RSD of less than 5.81%. The unique MWCNTs in situ anchor MIL-101(gamma-Fe2O3) composite with an outstanding PAHs adsorption performance provides a new opportunity and promising applica-tion in removal of toxic pollutants. ()C 2022 Elsevier B.V. All rights reserved.
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