Effect of Crosslinker Chemical Structure and Monomer Compositions on Adsorption of Uranium (VI) Ions Based on Reactive Crosslinked Acrylamidoxime Acrylic Acid Resins

Adsorption capacities of uranyl ions using crosslinked acrylamidoxime acrylic acid (Am/AA) resins composed from acrylonitrile (AN), acrylic acid (AA), having different molar ratios were determined. The AN/AA molar ratios were, 80/20,50/50,20/80, crosslinked with 10% N,N'-methylenebisacrylamide (MBA) and divinylbenzene (DVB). Polymerization occurred in the presence of potassium persulfate and sodium metabisulfite as redox initiator. Acrylonitrile acrylic acid resins (AN/AA) were converted to acrylamidoxime acrylic acid (Am/AA) by reaction with hydroxylamine solution. The chemical structure of the AN/AA and Am/AA resins, before and after loaded with uranyl ions and after elution, was confirmed by FTIR analysis. The effect of UO22+ ions sorption on the morphologies of the prepared resins was examined by scanning electron microscope (SEM). Effect of pH, time of loading, type of acid, molar ratio, and type of crosslinker were investigated. Elution of adsorbed ions on resins was investigated by different eluents. The elution efficiency was determined.