title: Ion imprinted polymeric nanoparticles for selective separation and sensitive determination of zinc ions in different matrices.
abstract: Preparation of Zn(2+) ion-imprinted polymer (Zn-IIP) nanoparticles is presented in this report. The Zn-IIP nanoparticles are prepared by dissolving stoichiometric amounts of zinc nitrate and selected chelating ligand, 3,5,7,20,40-pentahydroxyflavone, in 15 mL ethanol-acetonitrile (2:1; v/v) mixture as a porogen solvent in the presence of ethylene glycol-dimethacrylate (EGDMA) as cross-linking, methacrylic acid (MAA) as functional monomer, and 2,2-azobisisobutyronitrile (AIBN) as initiator. After polymerization, Cavities in the polymer particles corresponding to the Zn(2+) ions were created by leaching the polymer in HCl aqueous solution. The synthesized IIPs were characterized by scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, fluorescence spectroscopy and thermal analysis techniques. Also, the pH range for rebinding of Zn(2+) ion on the IIP and equilibrium binding time were optimized, using flame atomic absorption spectrometry. In selectivity study, it was found that imprinting results increased affinity of the material toward Zn(2+) ion over other competitor metal ions with the same charge and close ionic radius. The prepared IIPs were repeatedly used and regenerated for six times without any significant decrease in polymer binding affinities. Finally, the prepared sorbent was successfully applied to the selective recognition and determination of zinc ion in different real samples.
authors: Department of Chemistry, Razi University, Kermanshah, Iran. Electronic address: mshamsipur@yahoo.com.
authors: Mojtaba
authors: M
authors: Shamsipur
authors: Hamid Reza
authors: HR
authors: Rajabi
authors: Seied Mahdi
authors: SM
authors: Pourmortazavi
authors: Mahmoud
authors: M
authors: Roushani
mesh_terms: D007477:Ions / Q000737:chemistry*; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D054802:Molecular Imprinting; D053758:Nanoparticles / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D052616:Solid Phase Extraction; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction; D015032:Zinc / Q000032:analysis* / Q000302:isolation & purification*
chemical_list: D007477:Ions; D008689:Methacrylates; D011108:Polymers; C008384:methacrylic acid; D015032:Zinc
keywords: Characterization; Flame atomic absorption spectroscopy; Ion imprinted polymers; Nanoparticles; Separation; Zinc ion