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

Abstract

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.

Authors:
 [1];  [1];  [2];  [2];  [3];  [3];  [4];  [4];  [4]
  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
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1356490
Report Number(s):
PNNL-SA-118924
Journal ID: ISSN 2365-6549; AF5855000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Chemistry Select; Journal Volume: 2; Journal Issue: 13
Country of Publication:
United States
Language:
English
Subject:
Uranium from Seawater; amidoxime; reusability; nuclear fuel cycle

Citation Formats

Pan, Horng-Bin, Wai, Chien M., Kuo, Li-Jung, Gill, Gary, Tian, Guoxin, Rao, Linfeng, Das, Sadananda, Mayes, Richard T., and Janke, Christopher J. Bicarbonate Elution of Uranium from Amidoxime-Based Polymer Adsorbents for Sequestering Uranium from Seawater. United States: N. p., 2017. Web. doi:10.1002/slct.201700177.
Pan, Horng-Bin, Wai, Chien M., Kuo, Li-Jung, Gill, Gary, Tian, Guoxin, Rao, Linfeng, Das, Sadananda, Mayes, Richard T., & Janke, Christopher J. Bicarbonate Elution of Uranium from Amidoxime-Based Polymer Adsorbents for Sequestering Uranium from Seawater. United States. doi:10.1002/slct.201700177.
Pan, Horng-Bin, Wai, Chien M., Kuo, Li-Jung, Gill, Gary, Tian, Guoxin, Rao, Linfeng, Das, Sadananda, Mayes, Richard T., and Janke, Christopher J. Tue . "Bicarbonate Elution of Uranium from Amidoxime-Based Polymer Adsorbents for Sequestering Uranium from Seawater". United States. doi:10.1002/slct.201700177.
@article{osti_1356490,
title = {Bicarbonate Elution of Uranium from Amidoxime-Based Polymer Adsorbents for Sequestering Uranium from Seawater},
author = {Pan, Horng-Bin and Wai, Chien M. and Kuo, Li-Jung and Gill, Gary and Tian, Guoxin and Rao, Linfeng and Das, Sadananda and Mayes, Richard T. and Janke, Christopher J.},
abstractNote = {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.},
doi = {10.1002/slct.201700177},
journal = {Chemistry Select},
number = 13,
volume = 2,
place = {United States},
year = {Tue May 02 00:00:00 EDT 2017},
month = {Tue May 02 00:00:00 EDT 2017}
}