title: Aqueous Co(II) adsorption using 8-hydroxyquinoline anchored γ-Fe2O3@chitosan with Co(II) as imprinted ions.
abstract: A novel, bio-based 8-hydroxyquinoline (8-HQ) anchored magnetic chitosan using Co(II) as imprinted ions was prepared and applied for selective removal of Co(II) from aqueous solutions. At first, γ-Fe2O3 has been synthesized by solvent free precipitation route and then combined with 8-hydroxyquinoline anchored chitosan using epichlorohydrin (EPH) as crosslinking agent. The FT- IR spectra showed that 8-HQ has been successfully anchored onto chitosan structure. Moreover, TEM analysis confirmed that the nanocomposite has core-shell structure. The experimental results showed that equilibrium time was 10min moreover, the maximum adsorption capacity of Co(II) with non-imprinted and surface imprinted polymer at pH 8 were 66.6 and 100mgg(-1), respectively. The selectivity coefficient of Co(II) ions relative to Cd(II), Ni(II) and Pb(II) were 11, 42 and 2, respectively. Prepared biosorbent represented good stability and good repeatability after three cycle of sorption and desorption using 0.5molL-(1) of HNO3 as eluent. Kinetic and thermodynamic behavior were also investigated and result showed that cobalt adsorption followed second order model and endothermic path.
authors.affiliation: University of Tehran, University College of Science, School of Chemistry, PO Box 14155-6455, Tehran, Iran.
authors.forename: Mostafa
authors.initials: M
authors.lastname: Hossein Beyki
authors.affiliation: University of Tehran, University College of Science, School of Chemistry, PO Box 14155-6455, Tehran, Iran. Electronic address: shemiran@khayam.ut.ac.ir.
authors.forename: Farzaneh
authors.initials: F
authors.lastname: Shemirani
authors.affiliation: University of Tehran, University College of Science, School of Chemistry, PO Box 14155-6455, Tehran, Iran.
authors.forename: Mahsa
authors.initials: M
authors.lastname: Shirkhodaie
mesh_terms: D000327:Adsorption; D048271:Chitosan / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry* / Q000302:isolation & purification; D004811:Epichlorohydrin / Q000737:chemistry; D005290:Ferric Compounds / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D054802:Molecular Imprinting; D015125:Oxyquinoline / Q000737:chemistry*; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D005290:Ferric Compounds; D014874:Water Pollutants, Chemical; D014867:Water; D004811:Epichlorohydrin; C000499:ferric oxide; D003035:Cobalt; D015125:Oxyquinoline; D048271:Chitosan
keywords: Chitosan; Cobalt; Ion imprinted polymer; Magnetic nanoparticles