02838nas a2200253   4500008004100000022001400041245013200055210006900187260000800256300001400264490000600278520194300284653003702227653002602264653002802290653002002318653001202338653002902350100002102379700001602400700002602416700001702442856012502459       2020                        eng d  a2379-369400aPolymer nanorings with uranium specific clefts for selective recovery of uranium from acidic effluents via reductive adsorption0 aPolymer nanorings with uranium specific clefts for selective rec  cOCT  a3254-32630 v53 a<p>Nanostructured polymeric materials, functionalized with an appropriate receptor, have opened up newer possibilities for designing a reagent that shows analyte-specific recognition and efficient scavenging of an analyte that has either a detrimental influence on human physiology and environment or on its recovery for further value addition. Higher active surface area, morphological diversity, synthetic tunability for desired surface functionalization, and the ease of regeneration of a nanostructured material for further use have provided such materials with a distinct edge over conventional reagents. The use of a biodegradable polymeric backbone has an added significance owing to the recent concern over the impact of polymers on the environment. Functionalization of biodegradable sodium alginate with AENA (6.85% grafting) as the receptor functionality led to a unique open framework nanoring (NNRG) morphology with a favorable spatial orientation for specific recognition and efficient binding to uranyl ions (U) in an aqueous medium over a varied pH range. Nanoring morphology was confirmed by transmission electron microscopy and atomic force microscopy images. The nanoscale design maximizes the surface area for the molecular scavenger. A combination of all these features along with the reversible binding phenomenon has made NNRG a superior reagent for specific, efficient uptake of UO22+ species from an acidic (pH 3-4) solution and compares better than all existing UO22+-scavengers reported till date. This could be utilized for the recovery of uranyl species from a synthetic acidic effluent of the nuclear power. The results of the U uptake experiments reveal a maximum adsorption capacity of 268 mg of U per g of NNRG in a synthetic nuclear effluent. X-ray photoelectron spectroscopy studies revealed a reductive complexation process and stabilization of U(IV)-species in adsorbed uranium species (U@NNRG).</p>
10abiodegradable polymeric backbone10amolecular recognition10ananostructured material10asodium alginate10auranium10auranyl-specific receptor1 aKushwaha, Shilpi1 aMane, Manoj1 aRavindranathan, Sapna1 aDas, Amitava  uhttps://library.ncl.res.in/content/polymer-nanorings-uranium-specific-clefts-selective-recovery-uranium-acidic-effluents