A Highly Efficient Chelating Polymer for the Adsorption of Uranyl and Vanadyl Ions at Low Concentrations

Abstract

A new polymer containing double amidoxime groups per repeating unit was synthesized to enhance the metal ion uptake capacity. The adsorption properties of this new polymeric adsorbent, amidoximated poly(N,Ndipropionitrile acrylamide), for U(VI), V(V), Cu(II), Co(II) and Ni(II) ions were investigated by batch and flowthrough processes at very low concentration levels (ppb). The chelating polymer showed high adsorption capacity for uranyl as well as vanadyl ions. In selectivity studies from a mixture of metal ions in aqueous solutions, the adsorbent showed high selectivity for uranyl and vanadyl ions in the following order: U(VI) > V(V) Co(II) = Cu(II) Ni(II) as determined by calculating the distribution coefficients D, of corresponding ions. The adsorption of uranyl and vanadyl ions from natural seawater by the new adsorbent was also examined in flow through mode.

Vanadium accumulation in ascidians: A system overview

“…Another bacterial species, Geobacter metallireducens, has also been reported to reduce V V [67]. The reduction of U VI to U IV occurs as a biochemical cell process and can support cell growth of this species [68,69], which is consistent with the geochemical and chemical similarities between these two elements [70][71][72][73].…”

Removal of lithium and uranium from seawater using fly ash and slag generated in the CFBC technology

“…16,[19][20][21] As with lithium, it is also possible to recover U from seawater using an adsorption process. A number of adsorbents capable of binding U ions exist, including the following: inorganic substances, 22 polymers, 23 atom transfer radical polymerization prepared adsorbents (ATRPAs), 24 mesostructured organosilica-phosphonate hybrids, 25 highly porous and stable metal-organic frameworks (MOFs), 26 benzimidazole-functionalized 2-D COF, 27 nanostructured carbons (NCs), 28 genetically-engineered proteins and their associated materials (HAGEPs), 29 metal silicate nanotubes 30 and many others. All these adsorbents are expensive and therefore increase the cost of the entire process.…”

Recovery of Uranium from Seawater: Preparation and Development of Polymer-Supported Extractants

“…With a nitrogen capacity of 10.4 mmol/g, this recalculates to 3.79 mmol U/mol ligand . Since the diamidoxime has a higher uranyl affinity than the monoamidoxime, 23 the results reported here with pA suggest at least a 3-fold increase in uranyl capacity by the primary amine ligand (calculated on a mole basis) and a 4-fold increase when ligands with two primary amines per ligand are utilized.…”