A novel polyacrylonitrile–zeolite nanocomposite to clean Cs and Sr from radioactive waste
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Radioactive wastes containing Cs+ and Sr2+ are among the most dangerous environmental pollutants. Therefore, removing Cs+ and Sr2+ from environmental media is needed. Removal can be done by nanocrystalline ion exchangers. Nanocrystalline ion exchangers are studied in depth for the treatment of nuclear wastes because these exchangers have high exchange capacity and fast kinetics. However, operating the columns of these exchangers is very difficult. This issue may be overcome by the preparation and use of nanocomposites. Here, we prepared a novel polyacrylonitrile–zeolite nanocomposite for the removal of Cs+ and Sr2+ in a fixed-bed column operation. We studied the effect of influent flow rate, nanocomposite bed height and initial concentrations. Experimental data were analysed using the Thomas model and the bed-depth service time model. The results reveal that total adsorbed ion and bed capacity increased with increasing initial ions concentration and bed height; and decreased with increasing influent flow rate. The maximum bed capacity was 0.085 meq/g for Cs+ and 0.128 meq/g for Sr2+. The critical bed height (Z 0) was 4.35 cm for Cs+ and 2.89 cm for Sr2+. These findings demonstrate that the new nanocomposite is suitable for removal of Cs+ and Sr2+.
KeywordsNanocomposite Column study Adsorption Cesium Strontium Thomas model
- Faghihian H, Iravani M, Moayed M, Ghannadi-Maragheh M (2012) Preparation of a novel PAN–zeolite nanocomposite for removal of Cs+ and Sr2+ from aqueous solutions: kinetic, equilibrium and thermodynamic studies. SubmittedGoogle Scholar