Synthesis of phosphate-functionalized magnetic porous organic polymer: A sorbent for sensitive determination of neonicotinoid insecticides in water and lemon juice.

• A novel phosphate-functionalized magnetic POP were synthesized for the first time. • M-DBP-POP showed fast adsorption rate and high adsorption capacity to neonicotinoids. • A M-DBP-POP based MSPE-HPLC method was developed to determine four neonicotinoids. • Hydrogen bond, π-π and hydrophobic interactions were the main adsorption forces. • M-DBP-POP holds great application potential in the adsorption/separation field. There is an urgent need to prepare advanced functional materials for extraction and enrichment of trace organic pollutants from different samples. In this work, two novel phosphate-functionalized porous organic polymers (DBP-POP and DPP-POP) were synthesized for the first time. Compared with phosphate-free counterpart, both phosphate-functionalized POPs showed excellent adsorption performance for the neonicotinoids due to the hydrogen bonding, π-π interaction and hydrophobic interaction. For ease of separating the sorbent from solution, magnetic DBP-POP (M-DBP-POP) was further prepared as sorbent to extract neonicotinoids from environmental water and lemon juice samples prior to their determination by high performance liquid chromatography-ultraviolet detection. Under optimal conditions, the detection limits (S/ N = 3) of the method were 0.01–0.08 ng mL−1 for water and 0.03–0.10 ng mL−1 for lemon juice. The recoveries were in the range of 80.0% to 113.0% with relative standard deviation less than 10.6%. This work demonstrated the feasibility of phosphate-functionalized POPs for adsorption applications. [ABSTRACT FROM AUTHOR]