A core-shell structured magnetic covalent organic framework as a magnetic solid-phase extraction adsorbent for...

Area of Science:

• Materials Science
• Analytical Chemistry
• Environmental Science

Background:

• Phenylurea herbicides pose environmental and health risks.
• Accurate detection of trace herbicides is crucial for environmental monitoring.
• Advanced adsorbent materials are needed for efficient sample preconcentration.

Purpose of the Study:

• To synthesize and characterize a core-shell magnetic covalent organic framework (M-TpDAB).
• To develop a highly effective method for preconcentrating phenylurea herbicides using M-TpDAB.
• To apply the developed method for the trace analysis of herbicides in real-world samples.

Main Methods:

• Synthesis of M-TpDAB using 3,3'-diaminobenzidine (DAB) and 1,3,5-triformylphloroglucinol (Tp).
• Characterization using techniques like FTIR, BET, XRD, SEM, and TEM.
• Development of a preconcentration method coupled with high-performance liquid-phase chromatography (HPLC).

Main Results:

• M-TpDAB was successfully synthesized and characterized.
• The method showed good linearity (0.15-100 ng mL-1 for water, 1.0-100.0 ng mL-1 for tea).
• Low limits of detection (0.05-0.15 ng mL-1 for water) and high recoveries (84.6%-105% for water) were achieved.

Conclusions:

• M-TpDAB is an effective adsorbent for phenylurea herbicide preconcentration.
• The developed method offers a sensitive and reliable approach for herbicide analysis.
• This M-TpDAB-based technique provides a valuable alternative for trace herbicide determination in environmental samples.