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Title: Elution of uranium and transition metals from amidoxime-based polymer adsorbents for sequestering uranium from seawater

Journal Article · · Industrial and Engineering Chemistry Research
 [1];  [2];  [1];  [2];  [2];  [2];  [3];  [1]
  1. Univ. of Idaho, Moscow, ID (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
+ Show Author Affiliations

High-surface-area amidoxime and carboxylic acid grafted polymer adsorbents developed at Oak Ridge National Laboratory were tested for sequestering uranium in a flowing seawater flume system at the PNNL-Marine Sciences Laboratory. FTIR spectra indicate that a KOH conditioning process is necessary to remove the proton from the carboxylic acid and make the sorbent effective for sequestering uranium from seawater. The alkaline conditioning process also converts the amidoxime groups to carboxylate groups in the adsorbent. Both Na2CO3 H2O2 and hydrochloric acid elution methods can remove ~95% of the uranium sequestered by the adsorbent after 42 days of exposure in real seawater. The Na2CO3 H2O2 elution method is more selective for uranium than conventional acid elution. Iron and vanadium are the two major transition metals competing with uranium for adsorption to the amidoxime-based adsorbents in real seawater. Tiron (4,5-Dihydroxy-1,3-benzenedisulfonic acid disodium salt, 1 M) can remove iron from the adsorbent very effectively at pH around 7. The coordination between vanadium (V) and amidoxime is also discussed based on our 51V NMR data.

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
OSTI ID:
1265763
Journal Information:
Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 15 Vol. 55; ISSN 0888-5885
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (9)

Siderophore-inspired chelator hijacks uranium from aqueous medium journal February 2019
Origin of the unusually strong and selective binding of vanadium by polyamidoximes in seawater journal November 2017
Siderophore-inspired chelator hijacks uranium from aqueous medium journal February 2019
Interactions of vanadium( iv ) with amidoxime ligands: redox reactivity journal January 2018
Engineering robust metal–phenolic network membranes for uranium extraction from seawater journal January 2019
The use of silver nanoparticles for the recovery of uranium from seawater by means of biofouling mitigation journal January 2018
Highly fluorescent conjugated microporous polymers for concurrent adsorption and detection of uranium journal January 2019
An anionic manganese( ii ) metal–organic framework for uranyl adsorption journal January 2019
A highly efficient uranium grabber derived from acrylic fiber for extracting uranium from seawater journal January 2020

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