Polymers with hierarchical structure, large specific surface area, and multiple adsorption interactions have always been the research hotspots in the field of adsorbents in analytical chemistry. For this, a hierarchical-structured imidazolium ionic–liquid–modified phenolic resin polymer (ILPR) was synthesized using 3-aminophenol as a functional monomer, glyoxylic acid as a green cross-linker, IL as a modifier, and polyethylene glycol 6000 as a porogen. And the obtained ILPR was characterized by scanning electron microscopy, Fourier-transform infrared spectroscopy, elemental analysis and 13C nuclear magnetic resonance, which indicating that the IL was successfully introduced into the phenolic resin for changing the morphology of the material to form a porous structure and enriching the adsorption interactions of adsorbents (hydrogen bonds, electrostatic interactions, etc.). The fluffy porous structure with a rough surface were beneficial for providing surface for forming interactions with the analytes and ILPR. Because of the above advantages, ILPR as a tailored SPE adsorbent, coupled with HPLC was applied successfully in extraction and determination of trace phenylurea plant hormones (thidiazuron and forchlorfenuron) in matrix sample. Compared with the polymer without IL modification, adsorption performance of ILPR was increased by 13.6-84.6%. Therefore, the ILPR obtained by introducing IL into the design and synthesis of phenolic resin polymer can serve as a potential SPE adsorbent and is expected to be used for separation and extraction in the field of analytical chemistry.

Synthesis of hierarchical-structured imidazolium ionic–liquid–modified phenolic resin polymer: Applications in solid-phase extraction

ACS Spring 2022

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