A novel ion-imprinted nanocomposite for selective separation of Pb<sup>2+</sup> ions

2017-12-06T20:43:17Z (GMT) by Muharrem Karabörk Aliye Gök
<p>In this study, the ion-imprinting method has been integrated to develop a novel composite material for the selective separation of Pb<sup>2+</sup> ions. Also, Pb<sup>2+</sup> ion binding ability of the organosmectite based inorganic-organic composite incorporation of bicyclic C18 organic compound into smectite layers was conducted to draw a projection its potential use as a solid phase exchanger which is quite selective toward Pb<sup>2+</sup> ions. The ion-imprinted nanocomposites were characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), swelling tests, and elemental analyses. After that, maximum binding capacity, pH, and equilibrium binding time were also been optimized. In order to show the selectivity of the composite synthesized, non-imprinted composites were also synthesized in absence of Pb<sup>2+</sup> ions during polymerization. In this step, Ni<sup>2+</sup>, Co<sup>2+</sup>, Al<sup>3+</sup>, Zn<sup>2+</sup>, and Cu<sup>2+</sup> ions were used as competitors under batch adsorption conditions. The relative selectivity coefficients of imprinted composite were calculated as 28.5, 156.5, 69.3, 24.8 and 131.6 for Pb<sup>2+</sup>/Co<sup>2+</sup>, Pb<sup>2+</sup>/Cu<sup>2+</sup>, Pb<sup>2+</sup>/Al<sup>3+</sup>, Pb<sup>2+</sup>/Zn<sup>2+</sup>, Pb<sup>2+</sup>/Ni<sup>2+</sup> binary solutions, respectively. Finally, reusability of the composites was evaluated to show its cost-efficiency by repeating adsorption-desorption experiments ten-times. The adsorption capacity of the imprinted composites did not change significantly whereas that of non-imprinted version reduced dramatically.</p>