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

Abstract

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.

Authors:
 [1];  [2];  [1];  [2];  [2];  [2];  [3];  [1]
+ Show Author Affiliations
  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)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1265763
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Industrial and Engineering Chemistry Research
Additional Journal Information:
Journal Volume: 55; Journal Issue: 15; Journal ID: ISSN 0888-5885
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Pan, Horng-Bin, Kuo, Li-Jung, Miyamoto, Naomi, Wood, Jordana, Strivens, Jonathan E., Gill, Gary, Janke, Christopher James, and Wai, Chien. Elution of uranium and transition metals from amidoxime-based polymer adsorbents for sequestering uranium from seawater. United States: N. p., 2015. Web. doi:10.1021/acs.iecr.5b03307.
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Pan, Horng-Bin, Kuo, Li-Jung, Miyamoto, Naomi, Wood, Jordana, Strivens, Jonathan E., Gill, Gary, Janke, Christopher James, & Wai, Chien. Elution of uranium and transition metals from amidoxime-based polymer adsorbents for sequestering uranium from seawater. United States. https://doi.org/10.1021/acs.iecr.5b03307
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Pan, Horng-Bin, Kuo, Li-Jung, Miyamoto, Naomi, Wood, Jordana, Strivens, Jonathan E., Gill, Gary, Janke, Christopher James, and Wai, Chien. Mon . "Elution of uranium and transition metals from amidoxime-based polymer adsorbents for sequestering uranium from seawater". United States. https://doi.org/10.1021/acs.iecr.5b03307. https://www.osti.gov/servlets/purl/1265763.
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@article{osti_1265763,
title = {Elution of uranium and transition metals from amidoxime-based polymer adsorbents for sequestering uranium from seawater},
author = {Pan, Horng-Bin and Kuo, Li-Jung and Miyamoto, Naomi and Wood, Jordana and Strivens, Jonathan E. and Gill, Gary and Janke, Christopher James and Wai, Chien},
abstractNote = {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.},
doi = {10.1021/acs.iecr.5b03307},
journal = {Industrial and Engineering Chemistry Research},
number = 15,
volume = 55,
place = {United States},
year = {Mon Nov 30 00:00:00 EST 2015},
month = {Mon Nov 30 00:00:00 EST 2015}
}
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https://doi.org/10.1021/acs.iecr.5b03307
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margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Pope, Michael T.; Müller, Achim</span> </li> <li> Angewandte Chemie International Edition in English, Vol. 30, Issue 1</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1002/anie.199100341" class="text-muted" target="_blank" rel="noopener noreferrer">10.1002/anie.199100341<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> </div> <div class="pagination-container small"> <a class="pure-button prev page" href="#" rel="prev"><span class="sr-only">Previous Page</span><span class="fa fa-angle-left"></span></a> <ul class="pagination d-inline-block" style="padding-left:.2em;"></ul> <a class="pure-button next page" href="#" rel="next"><span class="sr-only">Next Page</span><span class="fa fa-angle-right"></span></a> </div> </div> </div> <div class="col-sm-3 order-sm-3"> <ul class="nav nav-stacked"> <li class="active"><a href="" class="reference-type-filter tab-nav" data-tab="biblio-references" data-filter="type" data-pattern="*"><span class="fa fa-angle-right"></span> All References</a></li> <li class="small" style="margin-left:.75em; 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font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2017-11-16">November 2017</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Ivanov, Alexander S.; Leggett, Christina J.; Parker, Bernard F.</span> </li> <li> Nature Communications, Vol. 8, Issue 1</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1038/s41467-017-01443-1" class="text-muted" target="_blank" rel="noopener noreferrer">10.1038/s41467-017-01443-1<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1039/c7dt04069e" target="_blank" rel="noopener noreferrer" class="name">Interactions of vanadium( <scp>iv</scp> ) with amidoxime ligands: redox reactivity<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2018-01-01">January 2018</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Parker, B. F.; Hohloch, S.; Pankhurst, J. R.</span> </li> <li> Dalton Transactions, Vol. 47, Issue 16</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1039/c7dt04069e" class="text-muted" target="_blank" rel="noopener noreferrer">10.1039/c7dt04069e<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1039/c8ta11764k" target="_blank" rel="noopener noreferrer" class="name">Highly fluorescent conjugated microporous polymers for concurrent adsorption and detection of uranium<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2019-01-01">January 2019</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Xu, Meiyun; Wang, Tao; Gao, Peng</span> </li> <li> Journal of Materials Chemistry A, Vol. 7, Issue 18</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1039/c8ta11764k" class="text-muted" target="_blank" rel="noopener noreferrer">10.1039/c8ta11764k<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1038/s41467-019-08758-1" target="_blank" rel="noopener noreferrer" class="name">Siderophore-inspired chelator hijacks uranium from aqueous medium<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2019-02-18">February 2019</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Ivanov, Alexander S.; Parker, Bernard F.; Zhang, Zhicheng</span> </li> <li> Nature Communications, Vol. 10, Issue 1</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1038/s41467-019-08758-1" class="text-muted" target="_blank" rel="noopener noreferrer">10.1038/s41467-019-08758-1<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1039/c9ce00603f" target="_blank" rel="noopener noreferrer" class="name">An anionic manganese( <scp>ii</scp> ) metal–organic framework for uranyl adsorption<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2019-01-01">January 2019</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Zhang, Tao; Ling, Bo-Kai; Hu, Yue-Qiao</span> </li> <li> CrystEngComm, Vol. 21, Issue 26</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1039/c9ce00603f" class="text-muted" target="_blank" rel="noopener noreferrer">10.1039/c9ce00603f<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1039/c9dt04562g" target="_blank" rel="noopener noreferrer" class="name">A highly efficient uranium grabber derived from acrylic fiber for extracting uranium from seawater<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2020-01-01">January 2020</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Pan, Horng-Bin; Wai, Chien M.; Kuo, Li-Jung</span> </li> <li> Dalton Transactions, Vol. 49, Issue 9</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1039/c9dt04562g" class="text-muted" target="_blank" rel="noopener noreferrer">10.1039/c9dt04562g<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1039/c8ee01438h" target="_blank" rel="noopener noreferrer" class="name">Engineering robust metal–phenolic network membranes for uranium extraction from seawater<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2019-01-01">January 2019</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Luo, Wei; Xiao, Gao; Tian, Fan</span> </li> <li> Energy & Environmental Science, Vol. 12, Issue 2</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1039/c8ee01438h" class="text-muted" target="_blank" rel="noopener noreferrer">10.1039/c8ee01438h<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1039/c8se00228b" target="_blank" rel="noopener noreferrer" class="name">The use of silver nanoparticles for the recovery of uranium from seawater by means of biofouling mitigation<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2018-01-01">January 2018</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Byers, Margaret Flicker; Landsberger, Sheldon; Schneider, Erich</span> </li> <li> Sustainable Energy & Fuels, Vol. 2, Issue 10</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1039/c8se00228b" class="text-muted" target="_blank" rel="noopener noreferrer">10.1039/c8se00228b<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1038/s41467-019-08758-1" target="_blank" rel="noopener noreferrer" class="name">Siderophore-inspired chelator hijacks uranium from aqueous medium<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2019-02-18">February 2019</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Ivanov, Alexander S.; Parker, Bernard F.; Zhang, Zhicheng</span> </li> <li> Nature Communications, Vol. 10, Issue 1</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1038/s41467-019-08758-1" class="text-muted" target="_blank" rel="noopener noreferrer">10.1038/s41467-019-08758-1<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> </div> <div class="pagination-container small"> <a class="pure-button prev page" href="#" rel="prev"><span class="sr-only">Previous Page</span><span class="fa fa-angle-left"></span></a> <ul class="pagination d-inline-block" style="padding-left:.2em;"></ul> <a class="pure-button next page" href="#" rel="next"><span class="sr-only">Next Page</span><span class="fa fa-angle-right"></span></a> </div> </div> </div> <div class="col-sm-3 order-sm-3"> <ul class="nav nav-stacked"> <li class="active"><a href="" class="reference-type-filter tab-nav" data-filter="type" data-pattern="*"><span class="fa fa-angle-right"></span> All Cited By</a></li> <li class="small" style="margin-left:.75em; 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float:none;">[ × clear filter / sort ]</a> </div> <input type="submit" id="sort_submit_citations" name="submit" aria-label="submit" style="display: none;"/> </form> </div> </div> </div> </section> <section id="biblio-related" class="tab-content tab-content-sec " data-tab="biblio"> <div class="row"> <div class="col-sm-9 order-sm-9"> <section id="biblio-similar" class="tab-content tab-content-sec active" data-tab="related"> <div class="padding"> <p class="lead text-muted" style="font-size: 18px; margin-top:0px;">Similar Records in DOE PAGES and OSTI.GOV collections:</p> <aside> <ul class="item-list" itemscope itemtype="http://schema.org/ItemList" style="padding-left:0; list-style-type: none;"> <li> <div class="article item document" itemprop="itemListElement" itemscope itemtype="http://schema.org/WebPage"><meta itemprop="position" content="0" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/biblio/1260866-elution-uranium-transition-metals-from-amidoxime-based-polymer-adsorbents-sequestering-uranium-from-seawater" itemprop="url">Elution of Uranium and Transition Metals from Amidoxime-Based Polymer Adsorbents for Sequestering Uranium from Seawater</a></h2> <div class="metadata"> <small class="text-muted" style="text-transform:uppercase;display:block;line-height:2.5em;">Journal Article</small><span class="authors"> <span class="author">Pan, Horng-Bin</span> ; <span class="author">Kuo, Li-Jung</span> ; <span class="author">Wai, Chien M.</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - Industrial and Engineering Chemistry Research</span> </span> </div> <div class="abstract">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 Na<sub>2</sub>CO<sub>3</sub>-H<sub>2</sub>O<sub>2</sub> and hydrochloric acid elution methods can remove ~95% of the uranium sequestered by the adsorbent after 42 days of exposure in real seawater. The Na<sub>2</sub>CO<sub>3</sub>-H<sub>2</sub>O<sub>2</sub><a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> elution method is more selective for uranium than conventional acid elution. Iron and vanadium are the two major transition metals competing with uranium for adsorption to the amidoxime-based adsorbents in real seawater.</span><a href='#' onclick='$(this).hide().prev().hide().prev().show();return false;' style='margin-left:10px;display:none;'>« less</a></div><div class="metadata-links small clearfix text-muted" style="margin-top:15px;"> <div class="pure-menu pure-menu-horizontal pull-right" style="width:unset;"> <ul class="pure-menu-list"> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc doi-link " href="https://doi.org/10.1021/acs.iecr.5b03307" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="1260866" data-product-type="Journal Article" data-product-subtype="AC" >https://doi.org/10.1021/acs.iecr.5b03307</a></span></li> </ul> </div> </div> </div> <div class="clearfix"></div> </div> </li> <li> <div class="article item document" itemprop="itemListElement" itemscope itemtype="http://schema.org/WebPage"><meta itemprop="position" content="2" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/pages/biblio/1362216-bicarbonate-elution-uranium-from-amidoxime-based-polymer-adsorbents-sequestering-uranium-from-seawater" itemprop="url">Bicarbonate Elution of Uranium from Amidoxime-Based Polymer Adsorbents for Sequestering Uranium from Seawater</a></h2> <div class="metadata"> <small class="text-muted" style="text-transform:uppercase;display:block;line-height:2.5em;">Journal Article</small><span class="authors"> <span class="author">Pan, Horng-Bin</span> ; <span class="author">Wai, Chien M.</span> ; <span class="author">Kuo, Li-Jung</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - Chemistry Select</span> </span> </div> <div class="abstract">Abstract Uranium adsorbed on amidoxime‐based polyethylene fibers in simulated seawater can be quantitatively eluted using 3 M KHCO <sub>3</sub> 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 <sup>−3</sup> 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.<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> Using the sequential bicarbonate and NaOH elution, the adsorbent is reusable after rinsing with deionized water and the recycled adsorbent shows no loss of uranium loading capacity based on real seawater experiments.</span><a href='#' onclick='$(this).hide().prev().hide().prev().show();return false;' style='margin-left:10px;display:none;'>« less</a></div><div class="metadata-links small clearfix text-muted" style="margin-top:15px;"> <span class="fa fa-book text-muted" aria-hidden="true"></span> Cited by 26<div class="pure-menu pure-menu-horizontal pull-right" style="width:unset;"> <ul class="pure-menu-list"> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc doi-link " href="https://doi.org/10.1002/slct.201700177" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="1362216" data-product-type="Journal Article" data-product-subtype="AM" >https://doi.org/10.1002/slct.201700177</a></span></li> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc fulltext-link " href="/pages/servlets/purl/1362216" title="Link to document media" target="_blank" rel="noopener" data-ostiid="1362216" data-product-type="Journal Article" data-product-subtype="AM" >Full Text Available</a></span></li> </ul> </div> </div> </div> <div class="clearfix"></div> </div> </li> <li> <div class="article item document" itemprop="itemListElement" itemscope itemtype="http://schema.org/WebPage"><meta itemprop="position" content="3" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/biblio/1243260-towards-understanding-koh-conditioning-amidoxime-based-polymer-adsorbents-sequestering-uranium-from-seawater" itemprop="url">Towards understanding KOH conditioning of amidoxime-based polymer adsorbents for sequestering uranium from seawater</a></h2> <div class="metadata"> <small class="text-muted" style="text-transform:uppercase;display:block;line-height:2.5em;">Journal Article</small><span class="authors"> <span class="author">Pan, Horng-Bin</span> ; <span class="author">Kuo, Li-Jung</span> ; <span class="author">Wood, Jordana</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - RSC Advances</span> </span> </div> <div class="abstract">Conditioning of polymer fiber adsorbents grafted with amidoxime and carboxylic acid groups is necessary to make the materials hydrophilic for sequestering uranium from seawater. Spectroscopic techniques were employed to study the effectiveness of the traditional KOH conditioning method (2.5% KOH at 80 oC) on recently developed high-surface-area amidoxime-based polymer fiber adsorbents developed at Oak Ridge National Laboratory. FTIR spectra reveal that the KOH conditioning process removes the proton from the carboxylic acids and also converts the amidoxime groups to carboxylate groups in the adsorbent. With prolonged KOH treatment (>1 hr) at 80 oC, physical damage to the adsorbent material occurs<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> which can lead to a significant reduction in the adsorbent’s uranium adsorption capability in real seawater during extended exposure times (>21 days). The physical damage to the adsorbent can be minimized by lowering KOH conditioning temperature. For the high-surface-area amidoxime-based adsorbents, 20 min of conditioning in 2.5% KOH at 80 oC or 1 hr of conditioning in 2.5% KOH at 60 oC appears sufficient to achieve de-protonation of the carboxylic acid with minimal harmful effects to the adsorbent material. The use of NaOH instead of KOH can also reduce the cost of the base treatment process required for conditioning the amidoxime-based sorbents with minimal loss of adsorption capacity (≤ 7%).</span><a href='#' onclick='$(this).hide().prev().hide().prev().show();return false;' style='margin-left:10px;display:none;'>« less</a></div><div class="metadata-links small clearfix text-muted" style="margin-top:15px;"> <div class="pure-menu pure-menu-horizontal pull-right" style="width:unset;"> <ul class="pure-menu-list"> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc doi-link " href="https://doi.org/10.1039/c5ra14095a" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="1243260" data-product-type="Journal Article" data-product-subtype="AC" >https://doi.org/10.1039/c5ra14095a</a></span></li> </ul> </div> </div> </div> <div class="clearfix"></div> </div> </li> <li> <div class="article item document" itemprop="itemListElement" itemscope itemtype="http://schema.org/WebPage"><meta itemprop="position" content="4" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/pages/biblio/1286877-towards-understanding-koh-conditioning-amidoxime-based-oolymer-adsorbents-sequestering-uranium-from-seawater" itemprop="url">Towards understanding KOH conditioning of amidoxime-based oolymer adsorbents for sequestering uranium from seawater</a></h2> <div class="metadata"> <small class="text-muted" style="text-transform:uppercase;display:block;line-height:2.5em;">Journal Article</small><span class="authors"> <span class="author">Pan, Horng-Bin</span> ; <span class="author">Kuo, Li-Jung</span> ; <span class="author">Wood, Jordana</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - RSC Advances</span> </span> </div> <div class="abstract">Conditioning of polymer fiber adsorbents grafted with amidoxime and carboxylic acid groups is necessary to make the materials hydrophilic for sequestering uranium from seawater. In this paper, spectroscopic techniques were employed to study the effectiveness of the traditional KOH conditioning method (2.5% KOH at 80⁰C) on recently developed high-surface-area amidoxime-based polymer fiber adsorbents developed at Oak Ridge National Laboratory. FTIR spectra reveal that the KOH conditioning process removes the proton from the carboxylic acids and also converts the amidoxime groups to carboxylate groups in the adsorbent. With prolonged KOH treatment (>1 hr) at 80⁰C, physical damage to the adsorbent material<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> occurs which can lead to a significant reduction in the adsorbent's uranium adsorption capability in real seawater during extended exposure times (>21 days). The physical damage to the adsorbent can be minimized by lowering KOH conditioning temperature. For the high-surface-area amidoxime-based adsorbents, 20 min of conditioning in 2.5% KOH at 80⁰C or 1 hr of conditioning in 2.5% KOH at 60⁰C appears sufficient to achieve de-protonation of the carboxylic acid with minimal harmful effects to the adsorbent material. Lastly, the use of NaOH instead of KOH can also reduce the cost of the base treatment process required for conditioning the amidoxime-based sorbents with minimal loss of adsorption capacity (≤7%).</span><a href='#' onclick='$(this).hide().prev().hide().prev().show();return false;' style='margin-left:10px;display:none;'>« less</a></div><div class="metadata-links small clearfix text-muted" style="margin-top:15px;"> <span class="fa fa-book text-muted" aria-hidden="true"></span> Cited by 26<div class="pure-menu pure-menu-horizontal pull-right" style="width:unset;"> <ul class="pure-menu-list"> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc doi-link " href="https://doi.org/10.1039/C5RA14095A" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="1286877" data-product-type="Journal Article" data-product-subtype="AM" >https://doi.org/10.1039/C5RA14095A</a></span></li> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc fulltext-link " href="/pages/servlets/purl/1286877" title="Link to document media" target="_blank" rel="noopener" data-ostiid="1286877" data-product-type="Journal Article" data-product-subtype="AM" >Full Text Available</a></span></li> </ul> </div> </div> </div> <div class="clearfix"></div> </div> </li> <li> <div class="article item document" itemprop="itemListElement" itemscope itemtype="http://schema.org/WebPage"><meta itemprop="position" content="5" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/biblio/1356490-bicarbonate-elution-uranium-from-amidoxime-based-polymer-adsorbents-sequestering-uranium-from-seawater" itemprop="url">Bicarbonate Elution of Uranium from Amidoxime-Based Polymer Adsorbents for Sequestering Uranium from Seawater</a></h2> <div class="metadata"> <small class="text-muted" style="text-transform:uppercase;display:block;line-height:2.5em;">Journal Article</small><span class="authors"> <span class="author">Pan, Horng-Bin</span> ; <span class="author">Wai, Chien M.</span> ; <span class="author">Kuo, Li-Jung</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - Chemistry Select</span> </span> </div> <div class="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<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> the sequential bicarbonate and NaOH elution, the adsorbent is reusable after rinsing with deionized water and the recycled adsorbent shows no loss of uranium loading capacity based on real seawater experiments.</span><a href='#' onclick='$(this).hide().prev().hide().prev().show();return false;' style='margin-left:10px;display:none;'>« less</a></div><div class="metadata-links small clearfix text-muted" style="margin-top:15px;"> <div class="pure-menu pure-menu-horizontal pull-right" style="width:unset;"> <ul class="pure-menu-list"> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc doi-link " href="https://doi.org/10.1002/slct.201700177" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="1356490" data-product-type="Journal Article" data-product-subtype="AC" >https://doi.org/10.1002/slct.201700177</a></span></li> </ul> </div> </div> </div> <div class="clearfix"></div> </div> </li> </ul> </aside> </div> </section> </div> <div class="col-sm-3 order-sm-3"> <ul class="nav nav-stacked"> <li class="active"><a class="tab-nav disabled" data-tab="related" style="color: #636c72 !important; 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