Molecularly imprinted ionic liquid magnetic microspheres for the rapid isolation of organochlorine pesticides in environmental water

Abstract

A new type of molecularly imprinted ionic liquid magnetic microspheres was synthesized by aqueous suspension polymerization, using 4,4'-dichlorobenzhydrol as a dummy template, and 1-allyl-3-ethylimidazolium hexafluorophosphate and methacrylic acid as co-functional monomers. The results of morphology and magnetic property evaluation of the obtained microspheres demonstrated that it was monodispersed spherical, possessed a rough surface, and an outstanding magnetic properties. Binding experiments revealed that it had a substantial adsorption capacity and strong recognition ability to organochlorine pesticides (OCPs) in aqueous solution. Then the microspheres were applied as an adsorbent of magnetic dispersive solid-phase extraction for the selective recognition and rapid determination of OCPs in environmental water. Under the optimum conditions, good linearity of the three types of OCPs (dicofol, tetradifon, and p,p'-dichlorodiphenyldichloroethane) was achieved in the range of 1.0-100 ng/mL (r ≥ 0.9994). The recoveries at three spiking levels ranged from 82.6 to 100.4% with the RSDs less than 6.9%.

Ionic liquids: solvents and sorbents in sample preparation

“…Qiao et al. developed magnetic MIPs using organochlorine pesticide templates, the 1‐allyl‐3‐ethylimidazolium [PF 6 − ] ([AEIM + ][PF 6 − ]), methacrylic acid, and Fe 3 O 4 microparticles . The authors determined that greater extraction efficiencies were obtained when higher amounts of IL were incorporated into the MIP magnetic microsphere.…”

Ionic-liquid-functionalized zinc oxide nanoparticles for the solid-phase extraction of triazine herbicides in corn prior to high-performance liquid chromatography analysis

“…ZnO NPs were also purchased from Aladdin Industrial Corporation (Shanghai, China). C 18 and cleanert pesticarb were supplied by Agela Technologies (Tianjin, China). Florisil (2MgO⋅3SiO 2 ⋅nH 2 O) and Zeolite artificial (Na 2 O⋅Al 2 O 3 ⋅xSiO 2 ⋅yH 2 O) were purchased from Sinopharm Chemical Reagent (Beijing, China).…”

“…As is well known, ionic liquids (ILs) with organic cationic components and the anionic part (inorganic or organic components) can facilitate the sample pretreatment processes for the extraction of organic target analytes in various samples , because the organic components of ILs can interact with analytes by π–π interaction, electrostatic attraction, hydrogen bonds, and dipole–dipole interaction . Task‐specific ILs, which are usually referred as functionalized ILs , can be obtained by introducing various functional groups, such as hydroxyl, carboxyl groups, carbamate, amino, ester, and urea to ILs .…”

Preparation of a novel supermacroporous molecularly imprinted cryogel membrane with a specific ionic liquid for protein recognition and permselectivity

“…Especially, ILs are becoming useful to prepare protein MIPs, because ILs can provide multiple weak interactions in the form of electrostatic interactions, hydrogen bonds, ionic bonds, and hydrophobic interactions with proteins, and have good water solubility to prepare protein MIPs in water media, and can dissolve, stabilize, and activate proteins . Overall, the introduction of ILs to prepare MIPs will improve the imprinting effect and specific recognition ability of MIPs to proteins . Thirdly, molecularly imprinted membranes (MIMs) can combine the advantages of membranes and MIPs, including high selectivity of MIPs and continuous separation of membrane separation .…”