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Title: Temperature Dependence of Uranium and Vanadium Adsorption on Amidoxime-Based Adsorbents in Natural Seawater

Journal Article · · Chemistry Select
 [1];  [1]; ORCiD logo [2];  [3];  [4];  [4]; ORCiD logo [2];  [1];  [1];  [1];  [5]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Marine Sciences Laboratory
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division
  4. Univ. of Idaho, Moscow, ID (United States). Department of Chemistry
  5. University of Miami, FL (United States). Rosensteil School of Marine and Atmospheric Chemistry
+ Show Author Affiliations

Recent advances in the development of amidoxime-based adsorbents have made it highly promising for seawater uranium extraction. However, there is a great need to understand the influence of temperature on the uranium sequestration performance of the adsorbents in natural seawater. Here in this work, the apparent enthalpy and entropy of the sorption of uranium (VI) and vanadium (V) with amidoxime-based adsorbents were determined in natural seawater tests at 8, 20, and 31 °C that cover a broad range of ambient seawater temperature. The sorption of U was highly endothermic, producing apparent enthalpies of 57 ± 6.0 and 59 ± 11 kJ mol-1 and apparent entropies of 314 ± 21 and 320 ± 36 J K-1 mol-1, respectively, for two adsorbent formulations. In contrast, the sorption of V showed a much smaller temperature sensitivity, producing apparent enthalpies of 6.1 ± 5.9 and -11 ± 5.7 kJ mol-1 and apparent entropies of 164 ± 20 and 103 ± 19 J K-1 mol-1, respectively. This new thermodynamic information suggests that amidoxime-based adsorbents will deliver significantly increased U adsorption capacities and improved selectivity in warmer waters. A separate field study of seawater uranium adsorption conducted in a warm seawater site (Miami, FL, USA) confirm the observed strong temperature effect on seawater uranium mining. Lastly, this strong temperature dependence demonstrates that the warmer the seawater where the amidoxime-based adsorbents are deployed the greater the yield for seawater uranium extraction.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Nuclear Energy (NE)
Grant/Contract Number:
AC05-00OR22725; AC05-76RL01830
OSTI ID:
1422590
Journal Information:
Chemistry Select, Journal Name: Chemistry Select Journal Issue: 2 Vol. 3; ISSN 2365-6549
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

References (25)

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Characterization and Testing of Amidoxime-Based Adsorbent Materials to Extract Uranium from Natural Seawater journal December 2015
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  • Tamada, Masao
  • International Seminar on Nuclear War and Planetary Emergencies 42nd Session, International Seminar on Nuclear War and Planetary Emergencies — 42nd Session https://doi.org/10.1142/9789814327503_0026
conference January 2012
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Cited By (3)

Photoinduced Multiple Effects to Enhance Uranium Extraction from Natural Seawater by Black Phosphorus Nanosheets journal November 2019
Photoinduced Multiple Effects to Enhance Uranium Extraction from Natural Seawater by Black Phosphorus Nanosheets journal December 2019
A highly efficient uranium grabber derived from acrylic fiber for extracting uranium from seawater journal January 2020

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