Development of a Functionalized Polymer-Coated Silica for the Removal of Uranium from Groundwater

Bryant, David E.; Stewart, Douglas I.; Kee, Terence P.; Barton, Catherine S.

doi:10.1021/es020178g

Cited by 72 publications

(26 citation statements)

References 20 publications

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“…According to FTIR and EXAFS results, uranyl sorption by the fiber was involved a specific number of chelating sites and thus compatible with the Langmuir model [38]. The fitting of data by Langmuir isotherm model is shown in Figure 6(a).…”

Section: Adsorption Behavior Of Uhmwpe-g-pao Fibersupporting

confidence: 70%

An Amidoximated-UHMEPE Fiber for Selective and High Efficient Removal of Uranyl and Thorium from Acid Aqueous Solution

Jin¹,

Hu²,

Wang³

et al. 2017

ACES

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High efficient removal and recovery of uranium and thorium from nuclear waste solution are essential for environmental preservation and fuel recycle. A new polymer fiber adsorbent (UHMEPE-g-PAO fiber), prepared by amidoximation of grafted polyacrylonitrile onto Ultra High Molecular Weight Polyethylene (UHMWPE) fiber, was used to remove the uranyl and thorium ions from acid aqueous solutions and its performance was carefully investigated. It was found that uranyl ion can penetrate the fiber through the connected pore structures, forming (UO 2 ) (R-C(NH 2 )-NO) 2 chelates with the amidoxime groups within the fiber. Two amidoxime groups (U-N and U-O eq ) and two water molecules (U-O eq2 ) are bound to uranyl ion in the fiber. On the contrary, thorium ions are adsorbed mainly on the fiber surface in the form of Th(OH) 4 precipitate that blocks the entrance of Th 4+ ion into fiber pores. The maximum included other two capacities of uranyl and thorium ions were estimated to be 262.01 mg/g and 160 mg/g at room temperature with pH 3.0, respectively. The results also indicate that the UHMWPE-g-PAO fiber has higher adsorption selectivity for uranyl ion than thorium ion. Uranium and thorium oxide particles were obtained as the ultimate product after sintering of the fiber adsorbent. This novel and environmentally friendly adsorption process is feasible to extract uranium or thorium from acidic aqueous solution.

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Section: Adsorption Behavior Of Uhmwpe-g-pao Fibersupporting

confidence: 70%

An Amidoximated-UHMEPE Fiber for Selective and High Efficient Removal of Uranyl and Thorium from Acid Aqueous Solution

Jin¹,

Hu²,

Wang³

et al. 2017

ACES

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“…As discussed earlier, the amidoxime coating on PANSIL can act as a bidentate ligand system with a high degree of specificity for uranyl cations. IR spectroscopy has confirmed that PANSIL can form strong ligand bonds with UO 2 2+ [8]. Thus the specificity for UO 2 2+ in the presence Pb 2+ is taken to indicate that uranyl sequestration by PANSIL is by this chelation mechanism.…”

Section: Discussionmentioning

confidence: 93%

“…The former is designed to work at pH < 5 where the uranyl cation is the major uranium specie, whereas the latter in intended for use at pH > 5 where uranyl carbonate anions predominate. The new material, PANSIL (made at the University of Leeds, UK [8]), is polyacryloamidoxime resin coated quartz sand (≈2% resin by wt.). PANSIL functionality is thought to be derived from the amidoxime groups that act as bidentate ligand systems for uranyl cations.…”

Section: Methodsmentioning

confidence: 99%

Performance of three resin-based materials for treating uranium-contaminated groundwater within a PRB

Barton

Stewart

Morris

et al. 2004

Journal of Hazardous Materials

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Three materials that are designed to treat uranium-contaminated water were investigated.These are a cation exchange resin, IRN77, an anion exchange resin, Varion AP, and a recently developed material called PANSIL (quartz sand coated with 2% amidoxime resin by wt.). The reaction rate, capacity, and effective pH range of the three materials are reported. The capacity and conditional distribution coefficient in neutral, uranyl contaminated synthetic groundwater containing carbonate are also reported. The suitability of each material for treating uraniumcontaminated groundwaters using a permeable reactive barrier approach is then discussed.All three materials react rapidly in the pH range 5-7, reaching equilibrium in less than 4 hours at ~23°C. The unconditioned cation exchange resin removed 8 g UO 2 2+ per kg of resin from neutral synthetic groundwater containing 30 mg/l of UO 2 2+ , but a lower capacity is anticipated in groundwater with either higher ionic strength or lower UO 2 2+ concentrations. It operates by first acidifying the solution, then sorbing UO 2 2+ , and can release UO 2 2+ when its buffering capacity has been exhausted. The anion exchange resin is very effective at removing anionic uranyl carbonate species from solutions with a pH above 5, with good specificity. Up to 50 g/kg of uranium is removed from contaminated groundwater at neutral pH. PANSIL is effective at sequestering cationic and neutral uranyl species from solutions in the pH range 4.5 to 7.5, with very good specificity. The capacity of PANSIL is pH dependent, increasing from about 0.4 g/kg at pH 4.5, to about 1 g/kg at pH 6 and 1.5 g/kg around pH 7.5. In neutral groundwater containing carbonate, both the anion exchange resin and PANSIL exhibit conditional distribution coefficients exceeding 1470 ml/g, which is about an order of magnitude higher than comparable reactive barrier materials reported in the literature.

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“…PANSIL is polyacryloamidoxime resin coated quartz sand (≈2% resin by wt., Bryant et al, 2003) whose functionality is thought to be derived from the amidoxime groups that act as bidentate ligands for uranyl cations. The lone pairs of electrons on the amino nitrogen and the oxime oxygen are donated to the positive metal centre to form a five-membered ring including the metal.…”

Section: Methodsmentioning

confidence: 99%

“…PANSIL has been extensively investigated in the laboratory (Bryant et al, 2003;Stewart et al, 2003;Barton et al, 2004), and this paper focuses on its performance with uranium contaminated groundwater extracted from near a mine tailings disposal site in Hungary.…”

Section: Introductionmentioning

confidence: 99%

Performance of a functionalised polymer-coated silica at treating uranium contaminated groundwater from a Hungarian mine site

Stewart

Csővári²,

Barton³

et al. 2006

Engineering Geology

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The performance of an active material for treating uranium contaminated groundwater within a permeable reactive barrier (PRB) is reported. This material, called PANSIL, has a tailored ligand system that selectively removes the uranyl (UO 2 2+) cation from solution. The active uranyl ligand in PANSIL is a polyacryloamidoxime resin derived from polyacrylonitrile, which is deposited from solution onto the surface of quartz sand to form a thin film coating.PANSIL is effective at sequestering cationic and neutral uranyl species when the solution pH is above 4, due to the stability of the polyacryloamidoxime-uranyl complex formed. However the rate of sequestration decreases rapidly when the pH exceeds about 8 where neutral uranyl species are present only at very low concentrations. It can preferentially sequester UO 2 2+ in the presence of typical divalent groundwater cations. In mildly alkaline conditions the sequestration performance in groundwater is sensitive to the concentration of uranyl complexing ligands, such as bicarbonate. Such behaviour has important consequences for PRB design as it will determine the barrier thickness required to treat a particular groundwater flow rate.1

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Development of a Functionalized Polymer-Coated Silica for the Removal of Uranium from Groundwater

Cited by 72 publications

References 20 publications

An Amidoximated-UHMEPE Fiber for Selective and High Efficient Removal of Uranyl and Thorium from Acid Aqueous Solution

An Amidoximated-UHMEPE Fiber for Selective and High Efficient Removal of Uranyl and Thorium from Acid Aqueous Solution

Performance of three resin-based materials for treating uranium-contaminated groundwater within a PRB

Performance of a functionalised polymer-coated silica at treating uranium contaminated groundwater from a Hungarian mine site

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