title: Design of a surface-immobilized 4-nitrophenol molecularly imprinted polymer via pre-grafting amino functional materials on magnetic nanoparticles.
abstract: In order to resolve the low adsorption capacity of the surface molecularly imprinting methods, an approach was developed for the preparation of magnetic imprinted polymers by pre-grafting the amino functional material, 3-aminopropyltriethoxysilane (APTES), on the surface of the silica coated magnetic substrate. APTES was used for amino functionalization of the silica coated Fe3O4 nanoparticles. Amino groups were used for immobilization of the template molecules on the magnetic surface and additionally to react with the terminal vinyl groups of cross-linker, ethylene glycol dimethacrylate (EGDMA), by the Michael addition reaction. In this way, the imprinting sites of the analytes formed on the substrate were increased. The sorbent was synthesized in the presence of 4-nitrophenol (4-NP) and EGDMA as the template and cross-linker, respectively. Different parameters affecting the adsorption, such as pH, desorption solvent type and adsorption time were evaluated and optimized. The prepared magnetic molecularly imprinted polymer (MMIP) showed high adsorption capacity and proper selectivity for the template molecule. The kinetic adsorption curve indicated that 90 min was sufficient to achieve the adsorption equilibrium for MMIP. The maximum adsorption capacity was 129.1 mg g(-1). The experiments exhibited a linear range of 10-3000 μg L(-1) for 4-NP with the correlation coefficient (R(2)) of 0.997. The results of the real sample analysis confirmed the applicability of the proposed MMIP for quantitative analysis of 4-NP in the aqueous samples.
authors.affiliation: Department of Marine Science, Iranian National Institute for Oceanography and Atmospheric Science, Tehran, Iran. Electronic address: mehdinia@inio.ac.ir.
authors.forename: Ali
authors.initials: A
authors.lastname: Mehdinia
authors.affiliation: Department of Chemistry, Faculty of Science, K. N. Toosi University of Technology, Tehran, Iran.
authors.forename: Sahar
authors.initials: S
authors.lastname: Dadkhah
authors.affiliation: Department of Chemistry, Faculty of Science, K. N. Toosi University of Technology, Tehran, Iran.
authors.forename: Tohid
authors.initials: T
authors.lastname: Baradaran Kayyal
authors.affiliation: Department of Chemistry, Faculty of Science, K. N. Toosi University of Technology, Tehran, Iran.
authors.forename: Ali
authors.initials: A
authors.lastname: Jabbari
mesh_terms: D000327:Adsorption; D003432:Cross-Linking Reagents / Q000737:chemistry; D007700:Kinetics; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D059346:Magnets; D008689:Methacrylates / Q000737:chemistry; D054802:Molecular Imprinting; D009596:Nitrophenols / Q000032:analysis / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D011437:Propylamines; D012623:Seawater / Q000737:chemistry; D012821:Silanes / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D003432:Cross-Linking Reagents; D058185:Magnetite Nanoparticles; D008689:Methacrylates; D009596:Nitrophenols; D011108:Polymers; D011437:Propylamines; D012821:Silanes; D014874:Water Pollutants, Chemical; D012822:Silicon Dioxide; C004919:ethylene dimethacrylate; C477625:amino-propyl-triethoxysilane; C024836:4-nitrophenol
keywords: 4-Nitrophenol; Immobilized template; Magnetic nanoparticles; Pre-grafted functional material; Surface imprinted polymer