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Title: Amidoxime Polymers for Uranium Adsorption: Influence of Comonomers and Temperature

Abstract

Recovering uranium from seawater has been the subject of many studies for decades, and has recently seen significant progress in materials development since the U.S. Department of Energy (DOE) has become involved. With DOE direction, the uranium uptake for amidoxime-based polymer adsorbents has more than tripled in capacity. In an effort to better understand how these new adsorbent materials behave under different environmental stimuli, several experimental and modeling based studies have been employed to investigate impacts of competing ions, salinity, pH, and other factors on uranium uptake. For this study, the effect of temperature and type of comonomer on uranium adsorption by three different amidoxime adsorbents (AF1, 38H, AI8) was examined. Experimental measurements of uranium uptake were taken in 1–L batch reactors from 10 to 40 °C. A chemisorption model was developed and applied in order to estimate unknown system parameters through optimization. Experimental results demonstrated that the overall uranium chemisorption process for all three materials is endothermic, which was also mirrored in the model results. Model simulations show very good agreement with the data and were able to predict the temperature effect on uranium adsorption as experimental conditions changed. Here, this model may be used for predicting uranium uptakemore » by other amidoxime materials.« less

Authors:
 [1];  [1];  [2];  [1]; ORCiD logo [3]
  1. Georgia Inst. of Technology, Atlanta, GA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Georgia Inst. of Technology, Atlanta, GA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE), Fuel Cycle Technologies (NE-5)
OSTI Identifier:
1422243
Alternate Identifier(s):
OSTI ID: 1409255
Grant/Contract Number:
AC05-00OR22725; 14-6789
Resource Type:
Journal Article: Published Article
Journal Name:
Materials
Additional Journal Information:
Journal Volume: 10; Journal Issue: 11; Journal ID: ISSN 1996-1944
Publisher:
MDPI
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; uranium adsorption; amidoxime; comonomer; seawater; temperature effect; modeling

Citation Formats

Ladshaw, Austin P., Wiechert, Alexander I., Das, Sadananda, Yiacoumi, Sotira, and Tsouris, Costas. Amidoxime Polymers for Uranium Adsorption: Influence of Comonomers and Temperature. United States: N. p., 2017. Web. doi:10.3390/ma10111268.
Ladshaw, Austin P., Wiechert, Alexander I., Das, Sadananda, Yiacoumi, Sotira, & Tsouris, Costas. Amidoxime Polymers for Uranium Adsorption: Influence of Comonomers and Temperature. United States. doi:10.3390/ma10111268.
Ladshaw, Austin P., Wiechert, Alexander I., Das, Sadananda, Yiacoumi, Sotira, and Tsouris, Costas. Sat . "Amidoxime Polymers for Uranium Adsorption: Influence of Comonomers and Temperature". United States. doi:10.3390/ma10111268.
@article{osti_1422243,
title = {Amidoxime Polymers for Uranium Adsorption: Influence of Comonomers and Temperature},
author = {Ladshaw, Austin P. and Wiechert, Alexander I. and Das, Sadananda and Yiacoumi, Sotira and Tsouris, Costas},
abstractNote = {Recovering uranium from seawater has been the subject of many studies for decades, and has recently seen significant progress in materials development since the U.S. Department of Energy (DOE) has become involved. With DOE direction, the uranium uptake for amidoxime-based polymer adsorbents has more than tripled in capacity. In an effort to better understand how these new adsorbent materials behave under different environmental stimuli, several experimental and modeling based studies have been employed to investigate impacts of competing ions, salinity, pH, and other factors on uranium uptake. For this study, the effect of temperature and type of comonomer on uranium adsorption by three different amidoxime adsorbents (AF1, 38H, AI8) was examined. Experimental measurements of uranium uptake were taken in 1–L batch reactors from 10 to 40 °C. A chemisorption model was developed and applied in order to estimate unknown system parameters through optimization. Experimental results demonstrated that the overall uranium chemisorption process for all three materials is endothermic, which was also mirrored in the model results. Model simulations show very good agreement with the data and were able to predict the temperature effect on uranium adsorption as experimental conditions changed. Here, this model may be used for predicting uranium uptake by other amidoxime materials.},
doi = {10.3390/ma10111268},
journal = {Materials},
number = 11,
volume = 10,
place = {United States},
year = {Sat Nov 04 00:00:00 EDT 2017},
month = {Sat Nov 04 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.3390/ma10111268

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