Synthesis, Characterization and Optimization of Magnetic Ion Imprinted Polymers for Selective Removal of Pb(II) and Cr(VI) from Wastewater of Ammonium Perchlorate Production Process

In this research a new type of magnetic Pb(II) and Cr(VI) ion-imprinted polymers were synthesized using Fe3O4@SiO2 magnetic particles as supporter, benzoyl phenyl hydroxylamine and dithizone as ligands for Pb and Cr ions respectively, 4vinyl pyridine as functional monomer, ethylene glycol dimethacrylate as crosslinker and 2,2′-azobis(isobutyronitrile) as the initiator. The ionic templates were achieved using HCl 2M as an eluent solution. The chemical structure, morphology, thermal behavior and magnetic properties of the sorbent polymers were evaluated using Fourier-transform infrared spectroscopy, scanning electron microscopy, thermal gravimetric analysis and vibrating sample magnetometry methods. Optimization of affecting parameters of the adsorption of analytes (adsorption time, pH, kind and concentration of the eluent solution, elution time and temperature) were performed using flame atomic absorption spectroscopy method. The results showed that the maximum adsorption capacities for lead and chromium at 40 ◦C were 92.3 and 96.8 milligrams per gram at pH of 6 and 3 respectively. The synthesized sorbents had high selectivity and were successfully applied for these pollutants removing from waste waters in vdifferent stages of ammonium perchlorate production process.