Organic Building Block Based Microporous Network SNW-1 Coating Fabricated by Multilayer Interbridging Strategy for Efficient Enrichment of Trace Volatiles

Abstract

Microporous organic polymers (MOPs) are an emerging class of functional porous materials for diverse potential applications. Typically, tailored microporous structures of MOPs are generated by linkages of organic polymerizable monomer building blocks, providing high permanent porosity and excellent stability. Herein, we reported the first example of the application of organic building block based MOPs (OBB-MOPs) as efficient enrichment media for sample preparation. A novel multilayer interbridging strategy was proposed to fabricate OBB-MOP coatings, and hereby SNW-1 (a kind of OBB-MOPs) was coated on silica substrate with well-controlled thickness. Strong covalent bonds throughout the network and interlayer bridging improved the durability of the coating significantly. Outstanding chemical stability was observed in diverse solvents as well as solutions with a wide range of pH or high ionic strength and even under extremely harsh conditions like boiling water. The SNW-1 coating possessed a microporous network structure constructed of conjugated and nitrogen-rich building blocks. Thus, the coating exhibited a superior enrichment performance of polycyclic aromatic hydrocarbons and volatile fatty acids (VFAs) over commercial coatings based on interactions including π-π affinity and acid-base interaction. For further application, this coating was combined with gas chromatography/mass spectrometry for the noninvasive analysis of VFAs from tea leaf and tobacco shred samples. The low detection limits of 0.014-0.026 μg/L were achieved with the relative standard deviations (RSDs) between 4.3 and 9.0%. Consequently, trace original VFAs from the samples were detected. Good recoveries were obtained in the range of 90-129% and 77-118% with the corresponding RSDs (n = 3) of 2.6-9.3% and 1.9-10%, respectively.

Magnetic‐covalent organic polymer solid‐phase extraction coupled with high‐performance liquid chromatography for the sensitive determination of fluorescent whitening agents in cosmetics

“…Pore property of magnetic COP nanoparticles was evaluated employing the N 2 adsorption–desorption experiment at 77 K. As shown in Figure E, the N 2 adsorption–desorption isotherms of the particle material display a type of V curve . Specially, as illustrated in the inset of Figure E, the pore size of magnetic COP nanoparticles was approximately 1.8 nm, attributing to the micropore structure of COP.…”

Recent advances in metal‐organic frameworks and covalent organic frameworks for sample preparation and chromatographic analysis

“…Furthermore, a suitable mechanism was proposed for guiding follow‐up experiments. Pan and co‐workers designed a COF‐coated SPME fiber for the efficient enrichment of trace volatiles. A γ‐(2,3‐epoxypropoxy)propyltrimethoxysilane (GPTES) was used to combine the COFs and the SPME fiber.…”

A covalently cross‐linked microporous polymer based micro‐solid phase extraction for online analysis of trace pesticide residues in citrus fruits

“…Covalent organic polymers (COPs) are a new type of organic materials, which are mainly composed of light nonmetallic elements including C, H, O, N, B, and connected by covalent bonds. COPs mainly include covalent organic frameworks (COFs), microporous organic polymers , and conjugated microporous polymers (CMPs) . COPs have many advantages, such as large surface area, controllable aperture size, high porosity, and easily modified surface structure.…”

“…The enrichment factor of this method is as high as 307–2327 times . Microporous organic polymers materials were used for the preparation of SPME fibers for efficient extraction of trace polycyclic aromatic hydrocarbons and free fatty acids . CMPs and magnetic nanoparticles have been used to prepare magnetic polyphenylene CMP for the analysis of hydroxy polycyclic aromatic hydrocarbons in urine.…”