Extracting uranium from seawater [electronic resource] : Promising AI series adsorbents.
Graft Polymerization; Amidoxime; Uranium Adsorption; Seawater; Koh Conditioning.
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| Online Access: |
Online Access (via OSTI) |
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| Corporate Author: | |
| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Office of the Assistant Secretary for Nuclear Energy ; distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
2015.
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| Subjects: |
| Summary: | Graft Polymerization; Amidoxime; Uranium Adsorption; Seawater; Koh Conditioning. |
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| Abstract: | A series of adsorbent (AI10 through AI17) were successfully developed at ORNL by radiation induced graft polymerization (RIGP) of acrylonitrile (AN) and vinylphosphonic acid (VPA) (at different mole/mole ratios) onto high surface area polyethylene fiber, with higher degree of grafting which ranges from 110 300%. The grafted nitrile groups were converted to amidoxime groups by reaction with 10 wt% hydroxylamine at 80 C for 72 hours. The amidoximated adsorbents were then conditioned with 0.44M KOH at 80 C followed by screening at ORNL with simulated seawater spiked with 8 ppm uranium. Uranium adsorption capacity in simulated seawater screening ranged from 171-187 g-U/kg-ads irrespective of %DOG. The performance of the adsorbents for uranium adsorption in natural seawater was also carried out using flow-through-column at Pacific Northwest National Laboratory (PNNL). The three hours KOH conditioning was better for higher uranium uptake than one hour. The adsorbent AI11 containing AN and VPA at the mole ration of 3.52, emerged as the potential candidate for higher uranium adsorption (3.35 g-U/Kg-ads.) after 56 days of exposure in the seawater in the flow-through-column. The rate vanadium adsorption over uranium was linearly increased throughout the 56 days exposure. The total vanadium uptake was ̃5 times over uranium after 56 days. |
| Item Description: | Published through SciTech Connect. 11/10/2015. "AF5855000" "NEAF344" Industrial and Engineering Chemistry Research 55 15 ISSN 0888-5885 AM. Das, Sadananda [ORNL]; Y. Oyola; Richard T. Mayes; Janke, Christopher James [ORNL]; Kuo, Li-Jung [Pacific Northwest National Laboratory (PNNL)]; Gill, Gary [Pacific Northwest National Laboratory (PNNL)]; Wood, Jordana [Pacific Northwest National Laboratory (PNNL)]; Dai, Sheng [ORNL] |
| Physical Description: | p. 4103-4109 : digital, PDF file. |