Facile fabrication of novel magnetic MOFs for highly efficient adsorption and determination of organophosphorus pesticides

The hazardous effects of residues from organophosphorus pesticides (OPPs) on human health have prompted researchers to look for innovative adsorbents and detecting techniques. Herein, a simple and economical material Fe 3 O 4 @PCN-224 was effectively produced as a desirable adsorbent for OPPs residues adsorption by integrating magnetic polydopamine (PDA) with the zirconium-based metal-organic framework (PCN-224). Modification of magnetic cores with PCN-224 allowed a dramatic increase in surface area and porosity to enhance pesticide adsorption. Moreover, the adsorption mechanisms inferred that π-π interactions, covalent bonds, and hydrogen bonds may promote the beneficial adsorption of OPPs by Fe 3 O 4 @PCN-224. Finally, the Fe 3 O 4 @PCN-224-based HPLC method exhibited with low detection limits (0.014–0.051 μg/L), good precision (1.70 % – 3.49 %), wide linearity (1–100 μg/L, R 2  ≥ 0.9936), satisfactory recoveries (86.16 % – 106.45 %), and high enrichment factors (92–101), demonstrating its significant potential for efficient extraction, enrichment, and analysis of OPPs in complex matrix samples.