title: Selective separation of lambdacyhalothrin by porous/magnetic molecularly imprinted polymers prepared by Pickering emulsion polymerization.
abstract: Porous/magnetic molecularly imprinted polymers (PM-MIPs) were prepared by Pickering emulsion polymerization. The reaction was carried out in an oil/water emulsion using magnetic halloysite nanotubes as the stabilizer instead of a toxic surfactant. In the oil phase, the imprinting process was conducted by radical polymerization of functional and cross-linked monomers, and porogen chloroform generated steam under the high reaction temperature, which resulted in some pores decorated with easily accessible molecular binding sites within the as-made PM-MIPs. The characterization demonstrated that the PM-MIPs were porous and magnetic inorganic-polymer composite microparticles with magnetic sensitivity (M(s) = 0.7448 emu/g), thermal stability (below 473 K) and magnetic stability (over the pH range of 2.0-8.0). The PM-MIPs were used as a sorbent for the selective binding of lambdacyhalothrin (LC) and rapidly separated under an external magnetic field. The Freundlich isotherm model gave a good fit to the experimental data. The adsorption kinetics of the PM-MIPs was well described by pseudo-second-order kinetics, indicating that the chemical process could be the rate-limiting step in the adsorption of LC. The selective recognition experiments exhibited the outstanding selective adsorption effect of the PM-MIPs for target LC. Moreover, the PM-MIPs regeneration without significant loss in adsorption capacity was demonstrated by at least four repeated cycles.
authors.affiliation: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Hang
authors.forename: Chunxiang
authors.initials: C
authors.lastname: Li
authors.forename: Jianming
authors.initials: J
authors.lastname: Pan
authors.forename: Linzi
authors.initials: L
authors.lastname: Li
authors.forename: Jiangdong
authors.initials: J
authors.lastname: Dai
authors.forename: Xiaohui
authors.initials: X
authors.lastname: Dai
authors.forename: Ping
authors.initials: P
authors.lastname: Yu
authors.forename: Yonghai
authors.initials: Y
authors.lastname: Feng
mesh_terms: D004655:Emulsions / Q000138:chemical synthesis / Q000737:chemistry; D060526:Magnetic Fields; D008968:Molecular Conformation; D054802:Molecular Imprinting; D043942:Nanotubes / Q000737:chemistry; D009570:Nitriles / Q000737:chemistry / Q000302:isolation & purification*; D009821:Oils / Q000737:chemistry; D010316:Particle Size; D058105:Polymerization; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry; D016062:Porosity; D011722:Pyrethrins / Q000737:chemistry / Q000302:isolation & purification*; D013499:Surface Properties; D014867:Water / Q000737:chemistry
chemical_list: D004655:Emulsions; D009570:Nitriles; D009821:Oils; D011108:Polymers; D011722:Pyrethrins; D014867:Water; C037304:cyhalothrin
keywords: Lambdacyhalothrin; Molecularly imprinted polymers; Pickering emulsion polymerization; Porous and magnetic microparticles; Selective separation