New Multi‐Dentate Ion‐Selective AXAD‐16‐MOPPA Polymer for the Preconcentration and Sequential Separation of U(VI), Th(IV) from Rare Earth Matrix

Raju, Ch. Siva Kesava; Srinivasan, Sriraman; Subramanian, M. S.

doi:10.1080/01496390500201193

Cited by 18 publications

(7 citation statements)

References 22 publications

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“…42 Emulsion polymerization was also investigated for the first time for development of uranium adsorbents. 43 Literature from the mid-to late-2000s is dominated by India, with studies reporting application of multidentate chelating ligands grafted on resin, 44 hydrogels composed of various copolymers, 45 amidoxime-based polypropylene sheets, 46 and infield demonstration experiments in the Trombay Estuary. 47 Since 2011, there has been renewed enthusiasm in the United States for extracting uranium from seawater, stemming from the formation of an interdisciplinary, multi-institution working group founded by the Office of Nuclear Energy.…”

Section: Brief History Of the Recovery Of Seawater Uraniummentioning

confidence: 99%

Materials for the Recovery of Uranium from Seawater

et al. 2017

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More than 1000× uranium exists in the oceans than exists in terrestrial ores. With nuclear power generation expected to increase over the coming decades, access to this unconventional reserve is a matter of energy security. With origins in the mid-1950s, materials have been developed for the selective recovery of seawater uranium for more than six decades, with a renewed interest in particular since 2010. This review comprehensively surveys materials developed from 2000-2016 for recovery of seawater uranium, in particular including recent developments in inorganic materials; polymer adsorbents and related research pertaining to amidoxime; and nanostructured materials such as metal-organic frameworks, porous-organic polymers, and mesoporous carbons. Challenges of performing reliable and reproducible uranium adsorption studies are also discussed, as well as the standardization of parameters necessary to ensure valid comparisons between different adsorbents.

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Section: Brief History Of the Recovery Of Seawater Uraniummentioning

confidence: 99%

Materials for the Recovery of Uranium from Seawater

et al. 2017

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“…The hydrophilic hydroxyl and antipyrine moieties enhance the metal ion accessibility into the polymer matrix, thereby significantly improving the kinetics. The developed grafted polymer showed greater selectivity for actinide ions like U(VI) and Th(IV) compared with the lanthanides with greater distribution ratio values in highly acidic matrices …”

Section: Water‐insoluble Polymersmentioning

confidence: 99%

Polymers and nanocomposites: synthesis and metal ion pollutant uptake

Rivas

Sánchez

Urbano

2015

Polymer International

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This paper is an overview of the versatile polymer materials containing different functional groups at the main or side chain to remove hazardous inorganic species. These materials include water-insoluble, nanocomposite and water-soluble polymers. Water-insoluble polymers and nanocomposites are used in adsorption and ion exchange processes, whereas water-soluble polymers are employed with ultrafiltration membranes in the liquid-phase polymer-based retention technique.

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“…Several methods have been used for separation and purification of thorium from different matrices, including precipitation methods, , chromatographic methods, − supercritical fluid extraction (SFE), , ion exchange resins, − electrochemical methods, , solid phase extraction, − molecular imprinting, − and solvent extraction. − Lack of selective precipitating agents, possibility of losing some of the samples during precipitation and washing, and difficulty of pH adjustment especially in industrial usage are disadvantages of the precipitation methods. The chromatographic and ion exchange methods are time consuming, and furthermore, they do not lead to quantitative separations.…”

Section: Introductionmentioning

confidence: 99%

Separation of Thorium from Zirconium Carbide Waste by Liquid–Liquid Extraction Using Tri-n-octylamine Solvent after Selective Acid Leaching

Nejad

Amini

Ghaziaskar

2020

Ind. Eng. Chem. Res.

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Separation of thorium from zirconium carbide waste is reported. The waste typically contains zirconium, yttrium, uranium, and thorium, along with other impurities including rare earth elements (REEs), iron, calcium, aluminum, hafnium, and titanium. The first step in the separation was selective leaching of zirconium, uranium, and most other impurities with HNO 3 −HF, leaving thorium and REEs as insoluble fluorides. The effective parameters such as HNO 3 and HF concentrations, temperature, and time were optimized for achieving the maximum leaching of zirconium and the minimum leaching of thorium, using central composite design and a multiple response optimization algorithm. Thorium and REEs were leached from the residual solid with H 2 SO 4 , followed by their precipitation with ammonia, dissolution of the precipitate in HNO 3 , and extraction of thorium with tri-noctylamine−kerosene. The factors affecting the extraction of thorium were optimized with respect to HNO 3 , TOA, diluent, V org /V aq , and extraction time. Using the above sample preparation and extraction methods, thorium could be extracted with an efficiency of 95.6%.

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New Multi‐Dentate Ion‐Selective AXAD‐16‐MOPPA Polymer for the Preconcentration and Sequential Separation of U(VI), Th(IV) from Rare Earth Matrix

Cited by 18 publications

References 22 publications

Materials for the Recovery of Uranium from Seawater

Materials for the Recovery of Uranium from Seawater

Polymers and nanocomposites: synthesis and metal ion pollutant uptake

Separation of Thorium from Zirconium Carbide Waste by Liquid–Liquid Extraction Using Tri-n-octylamine Solvent after Selective Acid Leaching

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