Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 421, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.126753
Keywords
Nanocomposite; Zeolitic imidazolate frameworks; Layered double hydroxides; Endocrine disrupting compounds; Dispersive micro-solid phase extraction; UHPLC-MS/MS
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Funding
- Natural Science Foundation of Ningxia Province, China [2020BEG03032, 2020AAC03136]
- Ningxia Medical University, China [XT2019015]
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A novel nanocomposite, Fe3O4@LDH/ZIF, was successfully fabricated and employed as a sorbent in dispersive micro-solid phase extraction for the enrichment of endocrine disrupting compounds in milk samples. The synthesized nanocomposite showed high adsorption capacities and promising potential for improving analytical performance in sample preparation.
For the first time, a novel nanocomposite, zeolitic imidazolate framework/magnetic layered double hydroxide (Fe3O4@LDH/ZIF), was successfully fabricated through in situ synthetic method with Fe3O4 as magnetic core and composite as shell. The resulting materials were characterized by XRD, TEM, FT-IR, VSM, TGA and nitrogen adsorption-desorption analysis. The Fe3O4@LDH/ZIF was employed as a sorbent in dispersive micro-solid phase extraction (D-mu-SPE) for enrichment of four endocrine disrupting compounds (EDCs) from milk samples prior to ultra-high performance liquid chromatography coupled with tandem mass spectrometry (UHPLC-MS/MS) analysis. The synthesized nanocomposite showed bigger specific surface area and better absorption capacity than Fe3O4@LDH. The equilibrium adsorption capacities (Qe, mg/g) of EDCs on the Fe3O4@LDH/ZIF reached up to 47.4-138.8 mg/g, mainly resulting from hydrogen bonding, pi-pi interaction and electrostatic interaction between EDCs and nanocomposite. Several variables affecting the extraction efficiency were investigated and optimized. The method displays low limits of detection (3-15 ng L-1), good linearity (10-5000 ng L-1), acceptable precision (RSD < 7.8%) and accuracy (RE < 5.2%). Satisfactory repeatability was obtained with RSD in the range of 1.2-7.8%. This work provides a promising approach for the development of new sorbent media in sample preparation for the improvement of analytical performance.
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