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Facile Preparation of Ion-Imprinted Composite Film for Selective Electrochemical Removal of Nickel(II) Ions

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Department of Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
North Japan Research Institute for Sustainable Energy (NJRISE), Hirosaki University, 2-1-3, Matsubara, Aomori 030-0813, Japan
*Phone: +86 3516018193; fax: +86 3516018554; e-mail: [email protected]; [email protected] (X.H.).
*Phone: +81 177627756; fax: +81 177355411; e-mail: [email protected] (G.G.).
Cite this: ACS Appl. Mater. Interfaces 2014, 6, 12, 9543–9549
Publication Date (Web):May 16, 2014
https://doi.org/10.1021/am501926u
Copyright © 2014 American Chemical Society

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    Abstract

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    A facile unipolar pulse electropolymerization (UPEP) technique is successfully applied for the preparation of ion-imprinted composite film composed of ferricyanide-embedded conductive polypyrrole (FCN/PPy) for the selective electrochemical removal of heavy metal ions from wastewater. The imprinted heavy metal ions are found to be easily removed in situ from the growing film only by tactfully applying potential oscillation due to the unstable coordination of FCN to the imprinted ions. The obtained Ni2+ ion-imprinted FCN/PPy composite film shows fast uptake/release ability for the removal of Ni2+ ions from aqueous solution, and the adsorption equilibrium time is less than 50 s. The ion exchange capacity reaches 1.298 mmol g–1 and retains 93.5% of its initial value even after 1000 uptake/release cycles. Separation factors of 6.3, 5.6, and 6.2 for Ni2+/Ca2+, Ni2+/K+, and Ni2+/Na+, respectively, are obtained. These characteristics are attributed to the high identification capability of the ion-imprinted composite film for the target ions and the dual driving forces resulting from both PPy and FCN during the redox process. It is expected that the present method can be used for simple preparation of other ion-imprinted composite films for the separation and recovery of target heavy metal ions as well.

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    (1) The detailed calculation method for separation factors; (2) the mass/current density transients during the UPEP of composite film; (3) the effect of Ni2+ ion initial concentration on the adsorption quantity of composite film; (4) the effect of pH value on the adsorption quantity of composite film; (5) simultaneous CV (A) and EQCM (B) curves of Ni2+-FCN/PPy composite film in 0.1 mol L–1 Ni(NO3)2 solution; (6) the relative selectivity of Ni2+-FCN/PPy composite film for Ni2+ ion with respect to other heavy metal ions; (7) EDS spectra of Ni2+-FCN/PPy composite film; (8) XPS spectra of Ni2+-FCN/PPy composite film; (9) separation characteristics of different ion-imprinted polymers for Ni2+ ion. This material is available free of charge via the Internet at http://pubs.acs.org.

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