Preparation of a fluorinated metal-organic framework and its application for the dispersive solid-phase extraction of perfluorooctanoic acid

J Chromatogr A. 2020 Jan 25:1611:460616. doi: 10.1016/j.chroma.2019.460616. Epub 2019 Oct 10.

Abstract

A fluorinated metal-organic framework material (F-MOF) was successfully prepared using tetrafluoroterephthalic acid (H2tfbdc) as the ligand and Zn(II) as the central metal ion. The F-MOF exhibited excellent adsorption performance for perfluorooctanoic acid (PFOA), with a maximum adsorption capacity of 419.8 mg g-1. A sensitive dispersive solid-phase extraction using the F-MOF as an adsorbent, coupled with GC-MS analysis, was developed for detecting trace PFOA with a limit of detection as low as 2.6 ng L-1. This method was applied to detect PFOA in environmental water samples, yielding satisfactory results.

Keywords: Dispersive solid-phase extraction; Fluorinated metal-organic framework; Gas chromatograph–mass spectrometer; Perfluorooctanoic acid.

MeSH terms

  • Adsorption
  • Caprylates / chemistry*
  • Fluorocarbons / chemistry*
  • Gas Chromatography-Mass Spectrometry
  • Halogenation*
  • Hydrogen-Ion Concentration
  • Lakes / chemistry
  • Ligands
  • Metal-Organic Frameworks / chemical synthesis*
  • Osmolar Concentration
  • Solid Phase Extraction / methods*
  • Solvents / chemistry
  • Thermogravimetry
  • Time Factors
  • Water / chemistry

Substances

  • Caprylates
  • Fluorocarbons
  • Ligands
  • Metal-Organic Frameworks
  • Solvents
  • Water
  • perfluorooctanoic acid