Title: Extracting uranium from seawater: Promising AF series adsorbents

Journal Article · · Industrial and Engineering Chemistry Research
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  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

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.

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:
1234340
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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Amidoxime Polymers for Uranium Adsorption: Influence of Comonomers and Temperature journal November 2017
Rational Design of Porous Nanofiber Adsorbent by Blow-Spinning with Ultrahigh Uranium Recovery Capacity from Seawater journal November 2018
A Marine‐Inspired Hybrid Sponge for Highly Efficient Uranium Extraction from Seawater journal May 2019
Significantly Enhanced Uranium Extraction from Seawater with Mass Produced Fully Amidoximated Nanofiber Adsorbent journal October 2018
Ultrafast and Highly Selective Uranium Extraction from Seawater by Hydrogel‐like Spidroin‐based Protein Fiber journal July 2019
A Dual‐Surface Amidoximated Halloysite Nanotube for High‐Efficiency Economical Uranium Extraction from Seawater journal September 2019
Photoinduced Multiple Effects to Enhance Uranium Extraction from Natural Seawater by Black Phosphorus Nanosheets journal November 2019
Ultrafast and Highly Selective Uranium Extraction from Seawater by Hydrogel-like Spidroin-based Protein Fiber journal July 2019
A Dual‐Surface Amidoximated Halloysite Nanotube for High‐Efficiency Economical Uranium Extraction from Seawater journal September 2019
Photoinduced Multiple Effects to Enhance Uranium Extraction from Natural Seawater by Black Phosphorus Nanosheets journal December 2019
Functional polymer brushes for highly efficient extraction of uranium from seawater journal October 2018
Origin of the unusually strong and selective binding of vanadium by polyamidoximes in seawater journal November 2017
Fit-for-purpose block polymer membranes molecularly engineered for water treatment journal April 2018
Binding of oxime group to uranyl ion journal January 2016
Polyamidoxime chain length drives emergent metal-binding phenomena journal January 2019
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
A highly efficient uranium grabber derived from acrylic fiber for extracting uranium from seawater journal January 2020
3D hierarchical porous amidoxime fibers speed up uranium extraction from seawater journal January 2019
Amidoxime Polymers for Uranium Adsorption: Influence of Comonomers and Temperature journal November 2017

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