A comparison of three methods of determining the concentration of uranium in sea water

Wilson, Jarod; Webster, R.; Milner, G.W.C.; Barnett, G.A.; Smales, A.A.

doi:10.1016/s0003-2670(60)80117-1

Cited by 53 publications

(6 citation statements)

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“…Part of the challenge of recovering uranium from seawater is in the development of materials that can dissociate the uranyl ion (UO 2 2+ ) from those stable aqueous species to capture uranium. In addition, extraction of uranyl is further complicated because of uranium being present at relatively low concentrations (3.3 μg/L) in seawater. , Over the last several decades, many materials and methods have been developed − for the recovery of uranium from seawater but polymers functionalized with amidoxime ligands have shown the greatest promise. , …”

Section: Introductionmentioning

confidence: 99%

“…In addition, extraction of uranyl is further complicated because of uranium being present at relatively low concentrations (3.3 μg/L) in seawater. 6,7 Over the last several decades, many materials and methods have been developed 8−12 for the recovery of uranium from seawater but polymers functionalized with amidoxime ligands have shown the greatest promise. 13,14 One of the best-performing adsorbent materials so far is a polyamidoxime-functionalized polyethylene (PAO-PE) fiber developed at the Oak Ridge National Laboratory (ORNL), which reportedly captured 3.3 g-U/kg-adsorbent after roughly 60 days in contact with natural seawater.…”

Section: Introductionmentioning

confidence: 99%

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First-Principles Integrated Adsorption Modeling for Selective Capture of Uranium from Seawater by Polyamidoxime Sorbent Materials

Ladshaw

Ivanov

Das

et al. 2018

ACS Appl. Mater. Interfaces

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Nuclear power is a relatively carbon-free energy source that has the capacity to be utilized today in an effort to stem the tides of global warming. The growing demand for nuclear energy, however, could put significant strain on our uranium ore resources, and the mining activities utilized to extract that ore can leave behind long-term environmental damage. A potential solution to enhance the supply of uranium fuel is to recover uranium from seawater using amidoximated adsorbent fibers. This technology has been studied for decades but is currently plagued by the material's relatively poor selectivity of uranium over its main competitor vanadium. In this work, we investigate the binding schemes between uranium, vanadium, and the amidoxime functional groups on the adsorbent surface. Using quantum chemical methods, binding strengths are approximated for a set of complexation reactions between uranium and vanadium with amidoxime functionalities. Those approximations are then coupled with a comprehensive aqueous adsorption model developed in this work to simulate the adsorption of uranium and vanadium under laboratory conditions. Experimental adsorption studies with uranium and vanadium over a wide pH range are performed, and the data collected are compared against simulation results to validate the model. It was found that coupling ab initio calculations with process level adsorption modeling provides accurate predictions of the adsorption capacity and selectivity of the sorbent materials. Furthermore, this work demonstrates that this multiscale modeling paradigm could be utilized to aid in the selection of superior ligands or ligand compositions for the selective capture of metal ions. Therefore, this first-principles integrated modeling approach opens the door to the in silico design of next-generation adsorbents with potentially superior efficiency and selectivity for uranium over vanadium in seawater.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

First-Principles Integrated Adsorption Modeling for Selective Capture of Uranium from Seawater by Polyamidoxime Sorbent Materials

Ladshaw

Ivanov

Das

et al. 2018

ACS Appl. Mater. Interfaces

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“…There is an astonishing amount of 4 billion tons of uranium dissolved in Earth's oceans. − This has led to the proposal to mine the oceans for uranium. − Such technology requires adsorbent materials that are capable of sequestering very low concentrations of uranium (3 ppb) from seawater in the presence of higher concentrations of competing metal ions (sodium, calcium, iron, etc.) .…”

Section: Introductionmentioning

confidence: 99%

Cyclic Imide Dioximes: Formation and Hydrolytic Stability

Kang

Vukovic

Custelcean

et al. 2012

Ind. Eng. Chem. Res.

107

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Poly(acrylamidoximes) play an important role in the uranium extraction from seawater. The present work reports solution studies of simple analogues to address the formation and stability of two binding sites present in these polymers, openchain amidoximes and cyclic imide dioximes, including: (1) conditions that maximize the formation of the cyclic form, (2) the existence of a base-induced conversion from open-chain to cyclic form, and (3) degradation under acid and base conditions.

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“…B. [12,13]). An diesem Wert ist die Brauchbarkeit des hier zunächst unter Verwendung von größeren U-Mengen ausgearbeiteten Nachweisverfahrens bezüglich seiner Empfindlichkeit zu prüfen.…”

Section: Abschätzung Der Nachweisempfindlichkeitunclassified

Aktivierungsanalytische Bestimmung von Uran-Spuren in marinen Systemen mit Abtrennung von ²³⁹Np durch Gegenstrom-Ionenwanderung

et al. 1971

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Die radiometrische Bestimmung von Uran-Spuren kann erfolgen durch Messung von radioaktiven Zerfallsprodukten wie m Rn [1, 2], ^"Pa [3] oder durch Messung von Spaltprodukten [4], oder über Nuklide aus der im Neutronenstrom gebildeten Umwandlungskette : 18 U(n,y) 23E U 23,5 min !39Np 2,35 d '»PU. Die Wahl des Bestimmungsnuklids hängt dabei ab von der Zusammensetzung (Aktivierbarkeit) der Matrixsubstanz und der erforderlichen Nachweisempfindlichkeit. Bei vielen marinen und biologischen Systemen liegen Uran-Konzentrationen im ppb-Bereich neben hohen Alkalihalogenid-Konzentrationen vor. Die chemische Abtrennung der Matrixaktivität ist bei derartigen Proben somit das Hauptproblem. Von TUKKOWSKI, STÄRK und BORN [5] wurde Μ ·Ϋ zum Nachweis gewählt, während in dieser Arbeit die Abtrennung der ^'Np-Aktivität aus neutronenbestrahltem Meerwasser durch das relativ einfache Verfahren der Gegenstrom-Ionenwanderung [6, 7] untersucht wird. Die Strahlungseigenschaften von ^Np gestatten seinen gamma-spektrometrischen Nachweis (11 y-Linien im Bereich von 99 bis 334 keV) und die Halbwertzeit von 2,35 d ist ausreichend lang, um auch zeitaufwendige Trennmethoden durchführen zu kön-nen*.

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A comparison of three methods of determining the concentration of uranium in sea water

Cited by 53 publications

References 6 publications

First-Principles Integrated Adsorption Modeling for Selective Capture of Uranium from Seawater by Polyamidoxime Sorbent Materials

First-Principles Integrated Adsorption Modeling for Selective Capture of Uranium from Seawater by Polyamidoxime Sorbent Materials

Cyclic Imide Dioximes: Formation and Hydrolytic Stability

Aktivierungsanalytische Bestimmung von Uran-Spuren in marinen Systemen mit Abtrennung von ²³⁹Np durch Gegenstrom-Ionenwanderung

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A comparison of three methods of determining the concentration of uranium in sea water

Cited by 53 publications

References 6 publications

First-Principles Integrated Adsorption Modeling for Selective Capture of Uranium from Seawater by Polyamidoxime Sorbent Materials

First-Principles Integrated Adsorption Modeling for Selective Capture of Uranium from Seawater by Polyamidoxime Sorbent Materials

Cyclic Imide Dioximes: Formation and Hydrolytic Stability

Aktivierungsanalytische Bestimmung von Uran-Spuren in marinen Systemen mit Abtrennung von 239Np durch Gegenstrom-Ionenwanderung

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Aktivierungsanalytische Bestimmung von Uran-Spuren in marinen Systemen mit Abtrennung von ²³⁹Np durch Gegenstrom-Ionenwanderung