Application of Ion - Imprinted Polymer Synthesized as New Sorbent for Preconcentration and Separation of Thallium (I) and Its Determination by Electrothermal Atomic Absorption Spectroscopy

Document Type: Research Article

Authors

1 Department of Chemistry, Faculty of Samen Hojaj, Mashhad Branch, Technical and Vocational University (TVU), Tehran, I.R. IRAN

2 Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, I.R. IRAN

Abstract

At this study, thallium (I) ion-imprinted polymer, as a novel sorbent for Tl (I) and comparison with Tl(III) ion-imprinted polymer has been synthesized. This sorbent for preconcentration and solid-phase extraction of Tl(I) ions from aqueous solutions, used. Through preparing the binary complex of Tl(I) ions with 5, 7-dichloroquinoline-8-ol (DCQ) the particles of thallium (I) Ion-Imprinted Polymer (IIP) have synthesized. In the presence of 2-methoxyethanole (porogen) and 2, 2ó-azobisisobutyronitrile (initiator, AIBN) Thermal copolymerization of methyl methacrylate (functional monomer, MMA) and ethyleneglycoldimethacrylate(cross-linkingmonomer, EGDMA) have done. The imprinted ion has removed from the polymer by removing the above particles with 1 mol/L HNO3 to obtain the leached IIP particles. Similarly, Control Polymer (CP) particles, have prepared without thallium (I) ions. The characterization of unleached and leached IIP particles was done by, Fourier-Transform InfraRed (FT-IR) spectroscopy, Brunauer-Emmett-Teller (BET), surface area analysis, and X-Ray Diffraction (XRD). As a function of pH, the preconcentration of thallium (I) has studied during rebinding with the leached IIP particles, for determination of thallium in aqueous solution, the weight of the polymer material, the elution and preconcentration times, the concentration of eluent(nitric acid), the volume of the aqueous phase and the volume of an eluent. ElectroThermal Atomic Absorption Spectrometry (ETAAS) has utilized. The method's Detection limit was 0.1 mg/ mL, while the relative standard deviation for five times repeat was 3.5%.

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