The needle trap extraction capability of a zinc-based metal organic framework with a nitrogen rich ligand

Abstract

A triple ring nitrogen rich ligand and along that a three-dimensional, zinc-based metal organic framework (MOF) were synthesized. The synthesized MOF was characterized by Fourier transform infrared spectroscopy (FT-IR), powder X-ray diffraction (PXRD), energy dispersive X-ray spectroscopy and mapping, scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) analyses. The extraction capability of the synthesized nanostructure was examined toward some analytes as model compounds. Properties such as porous structure and considerable surface area make it a suitable and efficient extractive phase. The extraction efficiency of the Zn-based MOF was evaluated for headspace needle trap extraction (HS-NTE) of benzene homologs (BTEX) as model compounds from aquatic media in conjunction with gas chromatography-mass spectrometry (GC-MS). To increase the sensitivity of the method, parameters including the extraction and desorption conditions were optimized. For some environmental water samples, acceptable relative recovery (RR) values at the concentration level of 20 ng L⁻¹ ranged from 85 to 96% and showing no significant matrix effect.

Keywords:

• Zinc-based metal organic framework
• needle trap extraction
• environmental analysis
• BTEX
• gas chromatography-mass spectrometry

Acknowledgment

The author acknowledges the Research Institute of Petroleum Industry, Tehran in Iran for support of this work.

Disclosure statement

No potential conflict of interest was reported by the authors.