سنتز، مشخصه‌یابی و بهینه‌سازی پلیمرهای قالب‌یونی مغناطیسی برای حذف انتخاب‌پذیر سرب(II) و کروم(VI) از پساب فرایند تولید آمونیوم پرکلرات

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, 4-vinyl pyridine as functional monomer, ethylene glycol dimethacrylate as crosslinker and 2,2′-azobis(isobutyronitrile) as the initiator. The ionic templates were achieved by using HCl 2M as an eluent solution. The chemical structure, morphology, thermal behaviour 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 including of medium pH, adsorption time, kind and concentration of the eluent solution, elution time and adsorption temperature were performed using flame atomic absorption spectroscopy method. The results showed that the maximum adsorption capacities for lead and chromium were 92.3 and 96.8 milligrams per gram in media pH of 6 and 3 under 40 ◦C temperature respectively. The synthesized sorbents had high selectivity and were successfully applied for these pollutants removing from waste waters of the various stages in the ammonium perchlorate production process.