Poly(amidoxime)-reduced graphene oxide composites as adsorbents for the enrichment of uranium from seawater

Abstract

The development of efficient materials for high extraction of uranium (UO 2 2+ ) from seawater is critical for nuclear energy. Poly(amidoxime)-reduced graphene oxide (PAO/rGO) composites with excellent adsorption capability for UO 2 2+ were synthesized by in situ polymerization of acrylonitrile monomers on GO surfaces, followed by amidoximation treatment with hydroxylamine. The adsorption capacities of PAO/rGO composites for UO 2 2+ reached as high as 872 mg/g at pH 4.0. The excellent tolerance of these composites for high salinity and their regeneration-reuse properties can be applied in the nuclear-fuel industry by high extraction of trace UO 2 2+ ions from seawater.

Positively charged phosphonate-functionalized mesoporous silica for efficient uranium sorption from aqueous solution

“…Among them, sorption offers several benefits such as simple operation, low cost, and easy recycling [10]. Various sorbents have been developed for potential uranium extraction from seawater, such as organic sorbents [11,12], inorganic sorbents [13,14], metal-organic frameworks [15], layered metal sulfides [14], engineered protein [3], nanoporous polymers [16], mesoporous carbons [17], ionimprinted composites [18,19] and graphene oxide composites [20]. Although a great progress has been achieved, there are still some challenges for uranium extraction from ocean.…”

Sorption and desorption properties of Eu(III) on attapulgite

“…ions at attapulgite particle surfaces. At pH [6, there is little difference in the sorption curves, which is attributed to the formation of inner-sphere surface complexes or surface (co)precipitates at high pH value [44,45]. At high pH values, the concentration of Eu(III) adsorbed on attapulgite surface at local area is high enough to form (co)precipitate.…”

Study on adsorption characteristics of uranyl ions from aqueous solutions using zirconium hydroxide

“…4 The proposed schematic diagram of adsorption mechanism of uranyl ion by ZH Table 1 Comparison of the q max for different adsorbents Adsorbents Conditions q max (mg g -1 ) Reference Zeolite Ph 6.0 T = 293 K 11.1 [11] Humic acid-immobilized zirconium-pillared clay pH 6.0 T = 303 K 132.7 [13] Natural diatomite pH 5 T = 294 K 6.1 [38] Fe 3 O 4 @SiO 2 pH 6.0 T = 298 K 52 [39] TiO 2 pH 4.5 T = 318 K 36.1 [40] Geothite pH 5.0 T = 298 K 28.2 [41] Nano alumina pH 5.0 T = 298 K 151.5 [41] Graphene oxide/polypyrrole pH 5.0 T = 298 K 147.1 [42] Amidoxime modified Fe 3 O 4 @SiO 2 pH 5.0 T = 298 K 105 [43] Cyclodextrin-modified graphene oxide nanosheets pH 5.0 T = 288 K 97.3 [44] Functionalized graphene oxide pH 4.0 T = 293 K 138.9 [45] Fe/Fe 3 C@porous carbon sheets pH 4 T = 298 K About 2300 [46] Poly(amidoxime)-reduced graphene oxide pH 4.0 T = 293 K 872 [47] ZH pH 5.0 T = 303 K 451.7 This work J Radioanal Nucl Chem illustrate the proposed adsorption mechanism. In Fig.…”