Extracting uranium from seawater: Promising AF series adsorbents
Abstract
Here, a new family of high surface area polyethylene fiber adsorbents (AF series) was recently developed at the Oak Ridge National Laboratory (ORNL). The AF series of were synthesized by radiation-induced graft polymerization of acrylonitrile and itaconic acid (at different monomer/co-monomer mol ratios) onto high surface area polyethylene fibers. The degree of grafting (%DOG) of AF series adsorbents was found to be 154 354%. The grafted nitrile groups were converted to amidoxime groups by treating with hydroxylamine. 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 170-200 g-U/kg-ads irrespective of %DOG. A monomer/co-monomer mol ratio in the range of 7.57-10.14 seemed to be optimum for highest uranium loading capacity. Subsequently, the adsorbents were also tested with natural seawater at Pacific Northwest National Laboratory (PNNL) using flow-through exposure uptake experiments to determine uranium loading capacity with varying KOH conditioning time at 80 C. The highest adsorption capacity of AF1 measured after 56 days of marine testing was demonstrated as 3.9 g-U/kg-adsorbent and 3.2 g-U/kg-adsorbent for 1hr and 3hrs of KOH conditioning at 80 C, respectively. Basedmore »
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Nuclear Energy (NE)
- OSTI Identifier:
- 1234340
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Industrial and Engineering Chemistry Research
- Additional Journal Information:
- Journal Volume: 55; Journal Issue: 15; Journal ID: ISSN 0888-5885
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 07 ISOTOPE AND RADIATION SOURCES; graft polymerization; amidoxime; uranium adsorption; seawater; KOH conditioning
Citation Formats
Das, Sadananda, Oyola, Y., Mayes, Richard T., Janke, Christopher James, Kuo, Li-Jung, Gill, Gary, Wood, Jordana, and Dai, Sheng. Extracting uranium from seawater: Promising AF series adsorbents. United States: N. p., 2015.
Web. doi:10.1021/acs.iecr.5b03136.
Das, Sadananda, Oyola, Y., Mayes, Richard T., Janke, Christopher James, Kuo, Li-Jung, Gill, Gary, Wood, Jordana, & Dai, Sheng. Extracting uranium from seawater: Promising AF series adsorbents. United States. https://doi.org/10.1021/acs.iecr.5b03136
Das, Sadananda, Oyola, Y., Mayes, Richard T., Janke, Christopher James, Kuo, Li-Jung, Gill, Gary, Wood, Jordana, and Dai, Sheng. Mon .
"Extracting uranium from seawater: Promising AF series adsorbents". United States. https://doi.org/10.1021/acs.iecr.5b03136. https://www.osti.gov/servlets/purl/1234340.
@article{osti_1234340,
title = {Extracting uranium from seawater: Promising AF series adsorbents},
author = {Das, Sadananda and Oyola, Y. and Mayes, Richard T. and Janke, Christopher James and Kuo, Li-Jung and Gill, Gary and Wood, Jordana and Dai, Sheng},
abstractNote = {Here, a new family of high surface area polyethylene fiber adsorbents (AF series) was recently developed at the Oak Ridge National Laboratory (ORNL). The AF series of were synthesized by radiation-induced graft polymerization of acrylonitrile and itaconic acid (at different monomer/co-monomer mol ratios) onto high surface area polyethylene fibers. The degree of grafting (%DOG) of AF series adsorbents was found to be 154 354%. The grafted nitrile groups were converted to amidoxime groups by treating with hydroxylamine. 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 170-200 g-U/kg-ads irrespective of %DOG. A monomer/co-monomer mol ratio in the range of 7.57-10.14 seemed to be optimum for highest uranium loading capacity. Subsequently, the adsorbents were also tested with natural seawater at Pacific Northwest National Laboratory (PNNL) using flow-through exposure uptake experiments to determine uranium loading capacity with varying KOH conditioning time at 80 C. The highest adsorption capacity of AF1 measured after 56 days of marine testing was demonstrated as 3.9 g-U/kg-adsorbent and 3.2 g-U/kg-adsorbent for 1hr and 3hrs of KOH conditioning at 80 C, respectively. Based on capacity values of several AF1 samples, it was observed that changing KOH conditioning from 3hrs to 1hr at 80 C resulted in 22-27% increase in uranium loading capacity in seawater.},
doi = {10.1021/acs.iecr.5b03136},
journal = {Industrial and Engineering Chemistry Research},
number = 15,
volume = 55,
place = {United States},
year = {Mon Nov 02 00:00:00 EST 2015},
month = {Mon Nov 02 00:00:00 EST 2015}
}
Web of Science
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