Synthesis of a metal–organic framework confined in periodic mesoporous silica with enhanced hydrostability as a novel fiber coating for solid‐phase microextraction

Abstract

A metal-organic framework/periodic mesoporous silica (MOF-5@SBA-15) hybrid material has been prepared by using SBA-15 as a matrix. The prepared MOF-5@SBA-15 hybrid material was then deposited on a stainless-steel wire to obtain the fiber for the solid-phase microextraction of phenolic compounds. Modifications in the metal-organic framework structure have proven to improve the extraction performance of MOF/SBA-15 hybrid materials, compared to pure MOF-5 and SBA-15. Optimum conditions include an extraction temperature of 75°C, a desorption temperature of 260°C, and a salt concentration of 20% w/v. The dynamic linear range and limit of detection range from 0.1-500 and from 0.01-3.12 ng/mL, respectively. The repeatability for one fiber (n = 3), expressed as relative standard deviation, is between 4.3 and 9.6%. The method offers the advantage of being simple to use, rapid, and low cost, the thermal stability of the fiber, and high relative recovery (compared to conventional methods) represent additional attractive features.

Fabrication of polyaniline‐coated halloysite nanotubes by in situ chemical polymerization as a solid‐phase microextraction coating for the analysis of volatile organic compounds in aqueous solutions

“…In SPME, the pH of the sample can be adjusted to decrease the solubility of some analytes and to provide better selectivity by increasing the extraction towards the headspace . The behavior differed with the characteristics of each phenolic compound.…”

“…Presently, increasing efforts have been directed toward the developing of novel sorbent materials to expand the applicability of SPME for a wider range of analytes and matrices. For instance, porous materials and their derivatives were used as novel coating materials for SPME with excellent performance .…”

“…In our previous studies, the significant enhancement of analyte extraction that was performed in SPME by providing integrated organic and inorganic materials such as mesoporous silicates, montmorillonite clays, layered double hydroxides lamellar materials was proposed and studied . These materials with high surface area have a high affinity for various volatile organic compounds.…”

Recent applications of metal–organic frameworks in sample pretreatment

“…Additionally, Abolghasemi et al. prepared MOF‐5@SBA‐15‐based SPME fiber for phenolic compounds with RSDs of 4.3–9.6%.…”

“…Consequently, MOF-199/GO fiber exhibited similar or higher enrichment factors compared to commercial PDMS and PDMS/DVB fibers. Additionally, Abolghasemi et al [106] prepared MOF-5@SBA-15-based SPME fiber for phenolic compounds with RSDs of 4.3-9.6%.…”