Web Release Date: March 7,
Polymer-Clay Nanocomposite Iron Traps Based on Intersurface Ion-Imprinting
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Department of Chemistry, Anadolu University, Eskisehir, Turkey, Department of Chemistry, Hacettepe University, Ankara, Turkey, and Plant, Drug and Scientific Researches Center, Anadolu University, Eskisehir, Turkey
Received for review June 28, 2007
Revised manuscript received November 5, 2007
Accepted January 26, 2008
Abstract:
We combined the ion-imprinting technique and the binding ability of Fe3+ ions to organosmectite to create the inorgano-organo Fe3+ ions imprinted polymer-nanocomposite traps with the goal of preparing a solid phase that has high selectivity for Fe3+ ions. In the first step, the intercalation of quartamine cations was conducted by an ion-exchange process between the smectite host and an aqueous quartamine solution and Fe3+ ions were complexed with methacryloylamidoantipyrine (MAAP). In the second step, quartamine cations were exchanged with a preorganized metal-chelate complex monomer for the preparation of polymer nanocomposite traps based on the intersurface ion-imprinting. After that, the template ions (i.e., Fe3+) were removed using 4.0 M HNO3 solution. Fe3+-imprinted nanocomposites were characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), swelling studies, and elemental analysis. Maximum binding capacity, optimum pH, and equilibrium binding time were found to be 78.5 mg/g, pH 3.0, and 10 min, respectively. The relative selectivity coefficients of the imprinted nanocomposite traps for Fe3+/Al3+, Fe3+/Cu2+, Fe3+/Co2+, and Fe3+/Zn2+ were 5.28, 11.4, 15.8, and 72.6 times greater than the nonimprinted nanocomposites, respectively. The Fe3+-imprinted nanocomposite traps could be used many times without decreasing in their adsorption capacities significantly.
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