Developing a novel pyridine-based ionic porous organic polymer with functional group for highly efficient extraction of phenolic endocrine disruptors in natural water and tilapia fish

A pyridine-based ionic porous organic polymer bearing hydroxyl groups (OH-iPOP) was developed for the first time by quaternization and crosslinking of 4-pyridinemethanol with 4,4 '-bis(chloromethyl)biphenyl. OH-iPOP exhibited strong adsorption capacity for endocrine disruptors (EDs) including bisphenol A, bisphenol F, p-tertbutylphenol and bisphenol B (82.59-183.9 mg g- 1), much higher than that of commercial adsorbents. The adsorption mechanism of OH-iPOP to EDs involved pi-pi* interaction, hydrogen bond and electrostatic interaction. Using OH-iPOP as solid phase extraction adsorbent combined with high-performance liquid chromatography, a reliable method for the sensitive detection of trace EDs in natural water and tilapia fish was established. The detection limits (S/N = 3) were 0.01-0.04 ng mL- 1 and 1.00-3.80 ng g- 1 for natural water and tilapia fish, respectively. The method recoveries ranged from 81.5 % to 116 %. This work not only develops an efficient adsorbent for the enrichment of EDs, but also provides a new strategy for the synthesis of novel cationic POPs.