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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Related Experiment Video

Updated: Sep 24, 2025

Preparation of Highly Porous Coordination Polymer Coatings on Macroporous Polymer Monoliths for Enhanced Enrichment of Phosphopeptides
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Effective solid-phase extraction of chlorophenols with covalent organic framework material as adsorbent.

Jiajia Liu1, Juntao Wang2, Yaxing Guo3

  • 1Department of Chemistry, College of Science, Hebei Agricultural University, Baoding, Hebei 071001, China.

Journal of Chromatography. A
|May 4, 2022
PubMed
Summary

A novel covalent organic framework, TP-NDA-COF, was developed for chlorophenol detection. This material enables sensitive and reliable solid-phase extraction and analysis of chlorophenols in water and beverages using HPLC.

Keywords:
ChlorophenolsCovalent organic frameworksHigh performance liquid chromatographySchiff-base aldehyde-amine condensation reactionSolid-phase extraction

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Environmental Science

Background:

  • Covalent organic frameworks (COFs) offer tunable properties for advanced applications.
  • Chlorophenols are common environmental pollutants requiring sensitive detection methods.

Purpose of the Study:

  • To synthesize and characterize a new porous COF material, TP-NDA-COF.
  • To evaluate TP-NDA-COF as a solid-phase extraction (SPE) adsorbent for chlorophenols.
  • To develop and validate an SPE-HPLC method for chlorophenol determination in complex matrices.

Main Methods:

  • Synthesis of TP-NDA-COF via condensation reaction.
  • Characterization using FT-IR, TGA, XRD, and SEM.
  • Solid-phase extraction (SPE) coupled with High-Performance Liquid Chromatography (HPLC-UV).

Main Results:

  • TP-NDA-COF was successfully synthesized and characterized.
  • Optimized SPE conditions demonstrated efficient chlorophenol extraction.
  • The method achieved low limits of detection (0.10-0.50 ng mL⁻¹) and good linearity (R² > 0.999).
  • High repeatability was observed with relative standard deviations below 7%.

Conclusions:

  • TP-NDA-COF is a promising adsorbent for chlorophenol extraction.
  • The developed SPE-HPLC method is suitable for quantifying chlorophenols in environmental water and food samples.
  • This work contributes to advancements in analytical techniques for pollutant monitoring.