An ion imprinted polymer (IIP) was synthesized by using Pb(II) as a template, methacrylic acid as a monomer, 8-hydoxyquinoline as a ligand, ethylene glycol dimethacrylate (EGDMA) as a crosslinker, and azobisisobutyronitrile as initiator. It can be applied to prepare lead ion selective voltammetric sensor for Pb(II) adsorption and trace detection. The Pb(II)-IIP was characterized by FTIR spectra and SEM image. Under optimized conditions of polymerization, the Pb(II)-IIP showed good adsorption behavior toward Pb(II), with a magnitude of three times higher than that of the non imprinted polymer (NIP). Also, it exhibited a favorable selectivity for Pb(II), compared with other heavy metal ions of Hg(II), Cd(II), Cu(II), and a negligible adsorption to the other cations. The synthesized IIP was used to determine trace levels of Pb(II) in food and water samples, with a calibration linear range over Pb(II) concentrations of 0.05 -60 μM and a limit of detection at 0.01 μM.
Mechanism for the formation of core-shell ATO-TiO2 was investigated. Zeta potential, XRD, TEM, XPS and LCR digital bridge were employed to characterize the morphology, phase structure, surface composition and conductivity of samples. Results indicated that the formation of ATO-TiO2 is through a synergistic effect between dispersive force and electrostatic repulsion, and this synergistic effect reaches the optimum status at pH = 2. Results obtained from theoretic calculation suggested that the ATO surrounded on TiO2 is in particle form, and the formation mechanism could be depicted by an “islands-on-sphere” model.
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