A New Magnetic Pb (II)-Imprinted Polymer as a Highly Selective Sorbent for Preconcentration and Determination of Lead Ions in Wastewater Samples

A magnetic Pb (II)-imprinted polymer (Pb (II)-IIP) aimed at the selective adsorption and preconcentration of Pb (II) was prepared via surface ion-imprinted technique using magnetic Fe3O4@SiO2 microspheres as supporter, Pb (II) as template ion, Gly-Gly-Gly as monomers, glutaraldehyde as cross linker. The product was characterized through Fourier-transform infrared, energy dispersive spectrometry, X-ray diffraction, scanning electron microscopy, and vibrating sample magnetometer. Pb-IIP showed higher affinity and selectivity for template lead ions. The maximum capacity of Pb-IIP (158.56 mg.g(-1)) is higher than that of other lead imprinted material. The relative selectivity coefficient (k') were 3.758, 2.366, 1.373 and 2.601 to Co(II)/Pb(II), Cu(II)/Pb(II), Cd(II)/Pb(II) and Zn(II)/Pb(II) binary solutions, respectively, higher than those of NIP. Desorption and regeneration studies showed that Pb (II)-IIP can be used five times without decreasing their adsorption capacities significantly. The linear range (LR), relative standard deviation (RSD%) and limit of detection (LOD, 3S(b)/m) for graphite furnace atomic absorption spectrometry (GFAAS) determination of lead ion, after its selective extraction by the prepared Pb(II)-IIP, were evaluated as 0.5-50.0 mu g.L-1, 1.45% and 3.18 ng.L-1, respectively. Furthermore, Pb (II)-IIP was successfully applied for preconcentration and determination of Pb (II) from wastewater samples.