title: Silver ion imprinted polymer nanobeads based on a aza-thioether crown containing a 1,10-phenanthroline subunit for solid phase extraction and for voltammetric and potentiometric silver sensors.
abstract: A new nano-sized silver(I) ion-imprinted polymer (IIP) was prepared via precipitation copolymerization using ethyleneglycol dimethacrylate, as a cross-linking agent in the presence of Ag(+) and an aza-thioether crown containing a 1,10-phenanthroline subunit as a highly selective complexing agent. The imprint silver(I) ion was removed from the polymeric matrix using a 1.0M HNO3 solution. The resulting powder material was characterized using IR spectroscopy and scanning electron microscopy. The SEM micrographs showed colloidal nanoparticles of about 52 nm and 75 nm in diameter and slightly irregular in shape for leached and unleached IIPs, respectively. The optimal pH for quantitative enrichment was 6.0 and maximum sorbent capacity of the prepared IIP for Ag(+) was 18.08 μmol g(-1). The relative standard deviation and limit of detection (LOD=3Sb/m) for flame atomic absorption spectrometric determination of silver(I) ion, after its selective extraction by the prepared IIP nanobeads, were evaluated as 2.42% and 2.2×10(-8) M, respectively. The new Ag(+)-IIP was also applied as a suitable sensing element to the preparation of highly selective and sensitive voltammetric and potentiometric sensors for ultra trace detection of silver(I) ion in water samples, with limits of detection of 9.0×10(-10) and 1.2×10(-9) M, respectively.
authors.affiliation: Department of Chemistry, Razi University, Kermanshah, Iran. Electronic address: mshamsipur@yahoo.com.
authors.forename: Mojtaba
authors.initials: M
authors.lastname: Shamsipur
authors.affiliation: Department of Chemistry, Razi University, Kermanshah, Iran.
authors.forename: Beshare
authors.initials: B
authors.lastname: Hashemi
authors.affiliation: Department of Chemistry, Razi University, Kermanshah, Iran.
authors.forename: Sara
authors.initials: S
authors.lastname: Dehdashtian
authors.affiliation: Department of Chemistry, Razi University, Kermanshah, Iran.
authors.forename: Moslem
authors.initials: M
authors.lastname: Mohammadi
authors.affiliation: Department of Chemistry, Razi University, Kermanshah, Iran.
authors.forename: Mohammad Bagher
authors.initials: MB
authors.lastname: Gholivand
authors.affiliation: Dipartimento di Scienze Chimiche e Geologiche, Universita` degli Studi di Cagliari, S.S. 554 Bivio per Sestu, 09042 Monserrato, CA, Italy.
authors.forename: Alessandra
authors.initials: A
authors.lastname: Garau
authors.affiliation: Dipartimento di Scienze Chimiche e Geologiche, Universita` degli Studi di Cagliari, S.S. 554 Bivio per Sestu, 09042 Monserrato, CA, Italy.
authors.forename: Vito
authors.initials: V
authors.lastname: Lippolis
keywords: Ag(+) ion; Differential pulse voltammetry; IIP-modified carbon paste electrode; Ion-imprinted polymeric nanoparticles; Potentiometry; Precipitation cpolymerization