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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:
; ; ; ;
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE; USDOE Office of Nuclear Energy (NE), Fuel Cycle Technologies (NE-5)
OSTI Identifier:
1422243
Alternate Identifier(s):
OSTI ID: 1409255
Grant/Contract Number:  
14-6789; AC05-00OR22725
Resource Type:
Published Article
Journal Name:
Materials
Additional Journal Information:
Journal Name: Materials Journal Volume: 10 Journal Issue: 11; Journal ID: ISSN 1996-1944
Publisher:
MDPI AG
Country of Publication:
Switzerland
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. Switzerland: N. p., 2017. Web. doi:10.3390/ma10111268.
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Ladshaw, Austin P., Wiechert, Alexander I., Das, Sadananda, Yiacoumi, Sotira, & Tsouris, Costas. Amidoxime Polymers for Uranium Adsorption: Influence of Comonomers and Temperature. Switzerland. https://doi.org/10.3390/ma10111268
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Ladshaw, Austin P., Wiechert, Alexander I., Das, Sadananda, Yiacoumi, Sotira, and Tsouris, Costas. Sat . "Amidoxime Polymers for Uranium Adsorption: Influence of Comonomers and Temperature". Switzerland. https://doi.org/10.3390/ma10111268.
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@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 = {Switzerland},
year = {Sat Nov 04 00:00:00 EDT 2017},
month = {Sat Nov 04 00:00:00 EDT 2017}
}
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https://doi.org/10.3390/ma10111268
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T.</span> </li> <li> Industrial & Engineering Chemistry Research, Vol. 55, Issue 15</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1021/acs.iecr.5b03135" class="text-muted" target="_blank" rel="noopener noreferrer">10.1021/acs.iecr.5b03135<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/10.1021/acs.inorgchem.5b02653" target="_blank" rel="noopener noreferrer" class="name">Complexation of Lanthanides with Glutaroimide-dioxime: Binding Strength and Coordination Modes<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="2016-01-12">January 2016</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;"> Ansari, Seraj A.; Yang, Yanqiu; Zhang, Zhicheng</span> </li> <li> Inorganic Chemistry, Vol. 55, Issue 3</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1021/acs.inorgchem.5b02653" class="text-muted" target="_blank" rel="noopener noreferrer">10.1021/acs.inorgchem.5b02653<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/10.1021/acs.iecr.5b03211" target="_blank" rel="noopener noreferrer" class="name">Acidity of the Poly(acrylamidoxime) Adsorbent in Aqueous Solution: Determination of the Proton Affinity Distribution via Potentiometric Titrations<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="2015-12-01">December 2015</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;"> Mehio, Nada; Williamson, Ben; Oyola, Yatsandra</span> </li> <li> Industrial & Engineering Chemistry Research, Vol. 55, Issue 15</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1021/acs.iecr.5b03211" class="text-muted" target="_blank" rel="noopener noreferrer">10.1021/acs.iecr.5b03211<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/10.1021/ie00027a025" target="_blank" rel="noopener noreferrer" class="name">Effect of seawater temperature on uranium recovery from seawater using amidoxime adsorbents<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="1994-03-01">March 1994</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;"> Sekiguchi, Koji; Saito, Kyoichi; Konishi, Satoshi</span> </li> <li> Industrial & Engineering Chemistry Research, Vol. 33, Issue 3</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1021/ie00027a025" class="text-muted" target="_blank" rel="noopener noreferrer">10.1021/ie00027a025<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/10.1021/acs.iecr.5b03456" target="_blank" rel="noopener noreferrer" class="name">Experiments and Modeling of Uranium Uptake by Amidoxime-Based Adsorbent in the Presence of Other Ions in Simulated 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="2015-12-01">December 2015</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;"> Ladshaw, A. P.; Das, S.; Liao, W. -P.</span> </li> <li> Industrial & Engineering Chemistry Research, Vol. 55, Issue 15</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1021/acs.iecr.5b03456" class="text-muted" target="_blank" rel="noopener noreferrer">10.1021/acs.iecr.5b03456<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/10.1080/01496398108057595" target="_blank" rel="noopener noreferrer" class="name">Extraction of Uranium from Seawater Using Magnetic Adsorbents<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="1981-10-01">October 1981</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;"> Yamashita, H.; Fujita, K.; Nakajima, F.</span> </li> <li> Separation Science and Technology, Vol. 16, Issue 9</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1080/01496398108057595" class="text-muted" target="_blank" rel="noopener noreferrer">10.1080/01496398108057595<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/10.1007/s10967-012-1912-x" target="_blank" rel="noopener noreferrer" class="name">Uranium (VI) recovery from saline environment by a marine unicellular cyanobacterium, Synechococcus elongatus<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="2012-07-03">July 2012</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;"> Acharya, C.; Chandwadkar, P.; Joseph, D.</span> </li> <li> Journal of Radioanalytical and Nuclear Chemistry, Vol. 295, Issue 2</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1007/s10967-012-1912-x" class="text-muted" target="_blank" rel="noopener noreferrer">10.1007/s10967-012-1912-x<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/c3dt32940b" target="_blank" rel="noopener noreferrer" class="name">Thermodynamic studies of U(vi) complexation with glutardiamidoxime for sequestration of 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="2013-01-01">January 2013</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;"> Tian, Guoxin; Teat, Simon J.; Rao, Linfeng</span> </li> <li> Dalton Transactions, Vol. 42, Issue 16</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1039/c3dt32940b" class="text-muted" target="_blank" rel="noopener noreferrer">10.1039/c3dt32940b<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/10.1021/ie00080a018" target="_blank" rel="noopener noreferrer" class="name">Composite fiber adsorbent for rapid uptake of uranyl 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="1988-08-01">August 1988</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;"> Kobuke, Yoshiaki; Tabushi, Iwao; Aoki, Takao</span> </li> <li> Industrial & Engineering Chemistry Research, Vol. 27, Issue 8</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1021/ie00080a018" class="text-muted" target="_blank" rel="noopener noreferrer">10.1021/ie00080a018<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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margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Wang, Jianlong; Zhuang, Shuting</span> </li> <li> Reviews in Environmental Science and Bio/Technology, Vol. 18, Issue 3</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1007/s11157-019-09507-y" class="text-muted" target="_blank" rel="noopener noreferrer">10.1007/s11157-019-09507-y<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/c9dt03313k" target="_blank" rel="noopener noreferrer" class="name">Complexation of UO <sub>2</sub> (CO <sub>3</sub> ) <sub>3</sub> <sup>4−</sup> with Mg <sup>2+</sup> at varying temperatures and its effect on U( <scp>vi</scp> ) speciation in groundwater and 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;"> Jo, Yongheum; Kim, Hee-Kyung; Yun, Jong-Il</span> </li> <li> Dalton Transactions, Vol. 48, Issue 39</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1039/c9dt03313k" class="text-muted" target="_blank" rel="noopener noreferrer">10.1039/c9dt03313k<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="1" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/pages/biblio/1286943-uranium-from-seawater-program-pnnl-overview-marine-testing-adsorbent-characterization-adsorbent-durability-adsorbent-toxicity-deployment-studies" itemprop="url">The uranium from seawater program at PNNL: Overview of marine testing, adsorbent characterization, adsorbent durability, adsorbent toxicity, and deployment studies</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">Gill, Gary A.</span> ; <span class="author">Kuo, Li -Jung</span> ; <span class="author">Janke, Christopher James</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - Industrial and Engineering Chemistry Research</span> </span> </div> <div class="abstract">The Pacific Northwest National Laboratory's (PNNL) Marine Science Laboratory (MSL) located along the coast of Washington State is evaluating the performance of uranium adsorption materials being developed for seawater extraction under realistic marine conditions with natural seawater. Two types of exposure systems were employed in this program: flow-through columns for testing of fixed beds of individual fibers and pellets and a recirculating water flume for testing of braided adsorbent material. Testing consists of measurements of the adsorption of uranium and other elements from seawater as a function of time, typically 42 to 56 day exposures, to determine the adsorbent capacity<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> and adsorption rate (kinetics). Analysis of uranium and other trace elements collected by the adsorbents was conducted following strong acid digestion of the adsorbent with 50% aqua regia using either Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) or Inductively Coupled Plasma Mass Spectrometer (ICP-MS). The ORNL 38H adsorbent had a 56 day adsorption capacity of 3.30 ± 0.68 g U/ kg adsorbent (normalized to a salinity of 35 psu), a saturation adsorption capacity of 4.89 ± 0.83 g U/kg of adsorbent material (normalized to a salinity of 35 psu) and a half-saturation time of 28 10 days. The AF1 adsorbent material had a 56 day adsorption capacity of 3.9 ± 0.2 g U/kg adsorbent material (normalized to a salinity of 35 psu), a saturation capacity of 5.4 ± 0.2 g U/kg adsorbent material (normalized to a salinity of 35 psu) and a half saturation time of 23 2 days. The ORNL amidoxime-based adsorbent materials are not specific for uranium, but also adsorb other elements from seawater. The major doubly charged cations in seawater (Ca and Mg) account for a majority of the cations adsorbed (61% by mass and 74% by molar percent). For the ORNL AF1 adsorbent material, U is the 4th most abundant element adsorbed by mass and 7th most abundant by molar percentage. Marine testing at Woods Hole Oceanographic Institution with the ORNL AF1 adsorbent produced 15% and 55% higher adsorption capacities than observed at PNNL for column and flume testing, respectively. Variations in competing ions may be the explanation for the regional differences. In addition to marine testing, a number of other efforts are underway to characterize adsorbents and impacts of deployment on the marine environment. Highlights include: Hydrodynamic modelling predicts that a farm of adsorbent materials will likely have minimal effect on ocean currents and removal of uranium and other elements from seawater when densities are < 1800 braids/km<sup>2</sup>. A decrease in U adsorption capacity of up to 30% was observed after 42 days of exposure due to biofouling when the ORNL braided adsorbent AI8 was exposed to raw seawater in a flume in the presence of light. An identical raw seawater exposure with no light exposure showed little or no impact to adsorption capacity from biofouling. No toxicity was observed with column effluents of any absorbent materials tested to date. Toxicity could be induced with some non amidoxime-based absorbents only when the ratio of solid absorbent to test media was increased to highly unrealistic levels. Thermodynamic modeling of the seawater-amidoxime adsorbent was performed using the geochemical modeling program PHREEQC. Modeling of the binding of Ca, Mg, Fe, Ni, Cu, U, and V from batch interactions with seawater across a variety of concentrations of the amidoxime binding group reveal that when binding sites are limited (1 x 10<sup>-8</sup> binding sites/kg seawater), vanadium heavily out-competes other ions for the amidoxime sites. In contrast, when binding sites are abundant magnesium and calcium dominate the total percentage of metals bound to the sorbent.</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 91<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.5b03649" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="1286943" data-product-type="Journal Article" data-product-subtype="AM" >https://doi.org/10.1021/acs.iecr.5b03649</a></span></li> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc fulltext-link " href="/pages/servlets/purl/1286943" title="Link to document media" target="_blank" rel="noopener" data-ostiid="1286943" 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="2" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/pages/biblio/1265762-characterization-testing-amidoxime-based-adsorbent-materials-extract-uranium-from-natural-seawater" itemprop="url">Characterization and testing of amidoxime-based adsorbent materials to extract uranium from natural 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">Kuo, Li-Jung</span> ; <span class="author">Janke, Christopher James</span> ; <span class="author">Wood, Jordana</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - Industrial and Engineering Chemistry Research</span> </span> </div> <div class="abstract">Extraction of uranium (U) from seawater for use as a nuclear fuel is a significant challenge due to the low concentration of U in seawater (~3.3 ppb) and difficulties to selectively extract U from the background of major and trace elements in seawater. The Pacific Northwest National Laboratory (PNNL) s Marine Sciences Laboratory (MSL) has been serving as a marine test site for determining performance characteristics (adsorption capacity, adsorption kinetics, and selectivity) of novel amidoxime-based polymeric adsorbents developed at Oak Ridge National Laboratory (ORNL) under natural seawater exposure conditions. This report describes the performance of three formulations (38H, AF1, AI8)<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> of amidoxime-based polymeric adsorbent produced at ORNL in MSL s ambient seawater testing facility. The adsorbents were produced in two forms, fibrous material (40-100 mg samples) and braided material (5-10 g samples), exposed to natural seawater using flow-through columns and recirculating flumes. All three formulations demonstrated high 56 day uranium adsorption capacity (>3 gU/kg adsorbent). The AF1 formulation had the best uranium adsorption performance, with 56-day capacity of 3.9 g U/kg adsorbent, saturation capacity of 5.4 g U/kg adsorbent, and ~25 days half-saturation time. The two exposure methods, flow-through columns and flumes were demonstrated to produce similar performance results, providing confidence that the test methods were reliable, that scaling up from 10 s of mg quantities of exposure in flow-through columns to gram quantities in flumes produced similar results, and that the manufacturing process produces a homogenous adsorbent. Adsorption kinetics appear to be element specific, with half-saturation times ranging from minutes for the major cations in seawater to 8-10weeks for V and Fe. Reducing the exposure time provides a potential pathway to improve the adsorption capacity of U by reducing the V/U ratio on the adsorbent.</span><a href='#' onclick='$(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 52<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.5b03267" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="1265762" data-product-type="Journal Article" data-product-subtype="AM" >https://doi.org/10.1021/acs.iecr.5b03267</a></span></li> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc fulltext-link " href="/pages/servlets/purl/1265762" title="Link to document media" target="_blank" rel="noopener" data-ostiid="1265762" 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/1327113-characterization-testing-amidoxime-based-adsorbent-materials-extract-uranium-from-natural-seawater" itemprop="url">Characterization and Testing of Amidoxime-Based Adsorbent Materials to Extract Uranium from Natural 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">Kuo, Li-Jung</span> ; <span class="author">Janke, Christopher J.</span> ; <span class="author">Wood, Jordana R.</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - Industrial and Engineering Chemistry Research</span> </span> </div> <div class="abstract">Extraction of uranium (U) from seawater for use as a nuclear fuel is a significant challenge due to the low concentration of U in seawater (~3.3 ppb) and difficulties to selectively extract U from the background of major and trace elements in seawater. The Pacific Northwest National Laboratory (PNNL)’s Marine Sciences Laboratory (MSL) has been serving as a marine test site for determining performance characteristics (adsorption capacity, adsorption kinetics, and selectivity) of novel amidoxime-based polymeric adsorbents developed at Oak Ridge National Laboratory (ORNL) under natural seawater exposure conditions. This manuscript describes the performance of three formulations (38H, AF1, AI8) of<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> amidoxime-based polymeric adsorbents produced at ORNL in MSL’s ambient seawater testing facility. The adsorbents were produced in two forms, fibrous material (40-100 mg samples) and braided material (5-10 g samples), and exposed to natural seawater using flow-through columns and recirculating flumes. All three formulations demonstrated high 56 day uranium adsorption capacity (>3 g U/kg adsorbent). The AF1 formulation had the best uranium adsorption performance, with a 56 day capacity of 3.9 g U/ kg adsorbent, a saturation capacity of 5.4 g U/kg adsorbent, and ~25 days half-saturation time. The two exposure methods, flowthrough columns and flumes, were demonstrated to produce similar performance results, providing confidence that the test methods were reliable, that scaling up from 10’s of mg quantities of exposure in flow-through columns to gram quantities in flumes produced similar results, and confirm that the manufacturing process produces a homogeneous adsorbent. Adsorption kinetics appear to be element specific, with half-saturation times ranging from minutes for the major cations in seawater, to 8-10 weeks for V and Fe. Reducing the exposure time provides a potential pathway to improve the adsorption capacity of U by reducing the V/U ratio on the adsorbent.</span><a href='#' onclick='$(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.5b03267" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="1327113" data-product-type="Journal Article" data-product-subtype="AC" >https://doi.org/10.1021/acs.iecr.5b03267</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="/biblio/1673581-uranium-recovery-from-seawater-using-amidoxime-based-braided-polymers-synthesized-from-acrylic-fibers" itemprop="url">Uranium recovery from seawater using amidoxime-based braided polymers synthesized from acrylic fibers</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">Wiechert, Alexander I.</span> ; <span class="author">Ladshaw, Austin</span> ; <span class="author">Kuo, Li-Jung</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - Industrial and Engineering Chemistry Research</span> </span> </div> <div class="abstract">Global demand for nuclear energy is expected to rise in the coming decades. To meet these growing needs, new uranium resources must be explored. One of the potential alternatives to traditional uranium mining is oceanic uranium. The capture and recovery of uranium from the ocean has been under investigation for some time, with many recent studies focused on amidoxime based adsorbents. These adsorbents while able to achieve high uranium recovery capacities are, nevertheless, expensive to produce and adsorb a significant amount of hard to remove vanadium. The purpose of this study is to evaluate the adsorption performance of amidoxime based<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> polymer braids synthesized from acrylic fibers which are designed to significantly cut polymer synthesis and conditioning costs. Adsorption experiments were performed in a recirculating raceway flume system at environmental conditions, approximately 10.8 oC, with 40-micron prefiltered seawater over 28 days for small and large sized LCW polymer braids. For both braid sizes, the adsorption of vanadium was far lower on the LCW materials than on Oak Ridge National Laboratory’s amidoxime based AF1 and AI8 small braids, with the LCW small braids outperforming both materials with respect to uranium adsorption under similar conditions. Adsorption modeling was used to simulate the performance at higher temperatures based on 20oC experiments previously performed with similar materials. Simulation results indicated that the small LCW braids would have a less significant advantage with respect to uranium adsorption over both AF1 and AI8 at 20oC and adsorb slightly less uranium than AF1 at 31oC. Vanadium adsorption by LCW small braids was less than one third of vanadium adsorption by either AF1 or AI8 for all temperatures. This behavior indicates that the LCW materials are able to achieve comparable uranium adsorption to other amidoxime adsorbents previously developed, while being cheaper to produce and adsorbing significantly less vanadium.</span><a href='#' onclick='$(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.0c01573" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="1673581" data-product-type="Journal Article" data-product-subtype="AC" >https://doi.org/10.1021/acs.iecr.0c01573</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="/pages/biblio/1651336-uranium-recovery-from-seawater-using-amidoxime-based-braided-polymers-synthesized-from-acrylic-fibers" itemprop="url">Uranium Recovery from Seawater Using Amidoxime-Based Braided Polymers Synthesized from Acrylic Fibers</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">Wiechert, Alexander I.</span> ; <span class="author">Ladshaw, Austin P.</span> ; <span class="author">Kuo, Li-Jung</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - Industrial and Engineering Chemistry Research</span> </span> </div> <div class="abstract">Global demand for nuclear energy is expected to rise in the coming decades. To meet these growing needs, new uranium resources must be explored. One of the potential alternatives to traditional uranium mining is oceanic uranium. The capture and recovery of uranium from the ocean have been under investigation for some time, with many recent studies focused on amidoxime-based adsorbents. These adsorbents, while able to achieve high uranium recovery capacities, are, nevertheless, expensive to produce and adsorb a significant amount of hard-to-remove vanadium. The purpose of this study is to evaluate the adsorption performance of amidoxime-based polymer braids synthesized from<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> acrylic fibers that are designed to significantly cut polymer synthesis and conditioning costs. Adsorption experiments were performed in a mesoscale recirculating raceway flume system at environmental conditions, approximately 10.8 °C, with 40-μm prefiltered seawater over 28 days for small- and large-sized polymer braids. For both braid sizes, the adsorption of vanadium was far lower on the acrylic adsorbent considered in the present study than on previously tested adsorbents developed at Oak Ridge National Laboratory (ORNL AF1 and AI8). The small acrylic braids also outperformed both ORNL materials with respect to uranium adsorption under similar conditions. Additionally, adsorption modeling was used to simulate the performance at higher temperatures based on 20 °C experiments previously performed with these materials. Simulation results indicated that the small acrylic braids would have a somewhat less significant advantage with respect to uranium adsorption over both ORNL AF1 and AI8 at 20 °C and will continue to outperform both ORNL adsorbents at 31 °C. Vanadium adsorption on the small acrylic braids was less than one-third of the vanadium adsorption on either AF1 or AI8 for all temperatures. Finally, this behavior indicates that the newly developed acrylic adsorbents are able to achieve superior uranium adsorption compared to other amidoxime adsorbents previously developed while being cheaper to produce and adsorbing significantly less vanadium.</span><a href='#' onclick='$(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 6<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.0c01573" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="1651336" data-product-type="Journal Article" data-product-subtype="AM" >https://doi.org/10.1021/acs.iecr.0c01573</a></span></li> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc fulltext-link " href="/pages/servlets/purl/1651336" title="Link to document media" target="_blank" rel="noopener" data-ostiid="1651336" 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> </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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