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Bicarbonate Elution of Uranium from Amidoxime-Based Polymer Adsorbents for Sequestering Uranium from Seawater

Journal Article · · Chemistry Select
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  1. Department of Chemistry, University of Idaho, Moscow, Idaho 83844 USA
  2. Pacific Northwest National Laboratory, Marine Sciences Laboratory, Sequim, Washington 98382 USA
  3. Lawrence Berkeley National Laboratory, Berkeley, California 94720 USA
  4. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 USA
+ Show Author Affiliations
Uranium adsorbed on amidoxime-based polyethylene fibers in simulated seawater can be quantitatively eluted using 3 M KHCO3 at 40°C. Thermodynamic calculations are in agreement with the experimental observation that at high bicarbonate concentrations (3 M) uranyl ions bound to amidoxime molecules are converted to uranyl tris-carbonato complex in the aqueous solution. The elution process is basically the reverse reaction of the uranium adsorption process which occurs at a very low bicarbonate concentration (~10-3 M) in seawater. In real seawater experiments, the bicarbonate elution is followed by a NaOH treatment to remove natural organic matter adsorbed on the polymer adsorbent. Using the sequential bicarbonate and NaOH elution, the adsorbent is reusable after rinsing with deionized water and the recycled adsorbent shows no loss of uranium loading capacity based on real seawater experiments.
Research Organization:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1356490
Report Number(s):
PNNL-SA--118924; AF5855000
Journal Information:
Chemistry Select, Journal Name: Chemistry Select Journal Issue: 13 Vol. 2; ISSN 2365-6549
Publisher:
Wiley
Country of Publication:
United States
Language:
English

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Cited By (3)

Polypropylene nonwoven fabric modified with oxime and guanidine for antibiofouling and highly selective uranium recovery from seawater journal May 2019
A highly efficient uranium grabber derived from acrylic fiber for extracting uranium from seawater journal January 2020
A Relativistic DFT Probe of Thorium and Protactinium Complexes Supported by Heterocalix[4]arene and Redox Properties of Early-Middle Actinides journal May 2018

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Related Subjects

Uranium from Seawater
amidoxime
nuclear fuel cycle
reusability