Role of Surface Alteration in Determining the Mobility of U(VI) in the Presence of Citrate: Implications for Extraction of U(VI) from Soils
In the present study, the adsorption of U(VI) by a natural iron-rich sand in the presence of citrate was studied over a range of citrate concentrations and pH values. Adsorption of U(VI) on the iron-rich sand decreased in the presence of increasing concentrations of citrate. Adsorption of citrate to...
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| Veröffentlicht in: | Environmental science & technology 2004-07, Vol.38 (13), p.3752-3759 |
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| creator | Logue, Brian A Smith, Robert W Westall, John C |
| description | In the present study, the adsorption of U(VI) by a natural iron-rich sand in the presence of citrate was studied over a range of citrate concentrations and pH values. Adsorption of U(VI) on the iron-rich sand decreased in the presence of increasing concentrations of citrate. Adsorption of citrate to the sand was weak under most conditions studied. Several explanations for the adsorption behavior of U(VI) and citrate were investigated, including aqueous complexation of U(VI) by citrate, competition of U(VI) and citrate for adsorption sites, and extraction of Fe and Al from the sorbent surface by citrate (surface alteration). Although aqueous complexation of U(VI) by citrate may still play a significant role, both competitive adsorption and aqueous complexation proved to be inadequate explanations of the adsorption behavior. Both physical surface alteration (i.e., loss of surface area) and chemical surface alteration (i.e., change in the chemical composition of the sand surface) were investigated, with chemical surface alteration controlling the bulk of U(VI) adsorption. Considering these results, remediation schemes that involve organic complexing agents should address the possibility of surface alteration affecting radionuclide adsorption and mobility. |
| doi_str_mv | 10.1021/es0350637 |
| format | Article |
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Adsorption of U(VI) on the iron-rich sand decreased in the presence of increasing concentrations of citrate. Adsorption of citrate to the sand was weak under most conditions studied. Several explanations for the adsorption behavior of U(VI) and citrate were investigated, including aqueous complexation of U(VI) by citrate, competition of U(VI) and citrate for adsorption sites, and extraction of Fe and Al from the sorbent surface by citrate (surface alteration). Although aqueous complexation of U(VI) by citrate may still play a significant role, both competitive adsorption and aqueous complexation proved to be inadequate explanations of the adsorption behavior. Both physical surface alteration (i.e., loss of surface area) and chemical surface alteration (i.e., change in the chemical composition of the sand surface) were investigated, with chemical surface alteration controlling the bulk of U(VI) adsorption. Considering these results, remediation schemes that involve organic complexing agents should address the possibility of surface alteration affecting radionuclide adsorption and mobility.</description><identifier>ISSN: 0013-936X</identifier><identifier>EISSN: 1520-5851</identifier><identifier>DOI: 10.1021/es0350637</identifier><identifier>PMID: 15296329</identifier><identifier>CODEN: ESTHAG</identifier><language>eng</language><publisher>Washington, DC: American Chemical Society</publisher><subject>Adsorption ; Aluminum - chemistry ; Applied sciences ; Chemical compounds ; Citric Acid - chemistry ; Decontamination. Miscellaneous ; Earth sciences ; Earth, ocean, space ; Engineering and environment geology. Geothermics ; Exact sciences and technology ; Hydrogen-Ion Concentration ; Iron ; Iron - chemistry ; Mass Spectrometry ; Models, Chemical ; Pollution ; Pollution, environment geology ; Sand & gravel ; Scintillation Counting ; Silicon Dioxide ; Soil and sediments pollution ; Soil Pollutants, Radioactive - analysis ; Surface chemistry ; Uranium ; Uranium - chemistry</subject><ispartof>Environmental science & technology, 2004-07, Vol.38 (13), p.3752-3759</ispartof><rights>Copyright © 2004 American Chemical Society</rights><rights>2004 INIST-CNRS</rights><rights>Copyright American Chemical Society Jul 1, 2004</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a460t-ba71fa446a202fcb3e563f986b9d93cfa28fc23af2b7ec0679cd597de6b46a8b3</citedby><cites>FETCH-LOGICAL-a460t-ba71fa446a202fcb3e563f986b9d93cfa28fc23af2b7ec0679cd597de6b46a8b3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://pubs.acs.org/doi/pdf/10.1021/es0350637$$EPDF$$P50$$Gacs$$H</linktopdf><linktohtml>$$Uhttps://pubs.acs.org/doi/10.1021/es0350637$$EHTML$$P50$$Gacs$$H</linktohtml><link.rule.ids>314,780,784,2765,27076,27924,27925,56738,56788</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=15918754$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/15296329$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Logue, Brian A</creatorcontrib><creatorcontrib>Smith, Robert W</creatorcontrib><creatorcontrib>Westall, John C</creatorcontrib><title>Role of Surface Alteration in Determining the Mobility of U(VI) in the Presence of Citrate: Implications for Extraction of U(VI) from Soils</title><title>Environmental science & technology</title><addtitle>Environ. Sci. Technol</addtitle><description>In the present study, the adsorption of U(VI) by a natural iron-rich sand in the presence of citrate was studied over a range of citrate concentrations and pH values. Adsorption of U(VI) on the iron-rich sand decreased in the presence of increasing concentrations of citrate. Adsorption of citrate to the sand was weak under most conditions studied. Several explanations for the adsorption behavior of U(VI) and citrate were investigated, including aqueous complexation of U(VI) by citrate, competition of U(VI) and citrate for adsorption sites, and extraction of Fe and Al from the sorbent surface by citrate (surface alteration). Although aqueous complexation of U(VI) by citrate may still play a significant role, both competitive adsorption and aqueous complexation proved to be inadequate explanations of the adsorption behavior. Both physical surface alteration (i.e., loss of surface area) and chemical surface alteration (i.e., change in the chemical composition of the sand surface) were investigated, with chemical surface alteration controlling the bulk of U(VI) adsorption. Considering these results, remediation schemes that involve organic complexing agents should address the possibility of surface alteration affecting radionuclide adsorption and mobility.</description><subject>Adsorption</subject><subject>Aluminum - chemistry</subject><subject>Applied sciences</subject><subject>Chemical compounds</subject><subject>Citric Acid - chemistry</subject><subject>Decontamination. Miscellaneous</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Engineering and environment geology. 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Miscellaneous</topic><topic>Earth sciences</topic><topic>Earth, ocean, space</topic><topic>Engineering and environment geology. Geothermics</topic><topic>Exact sciences and technology</topic><topic>Hydrogen-Ion Concentration</topic><topic>Iron</topic><topic>Iron - chemistry</topic><topic>Mass Spectrometry</topic><topic>Models, Chemical</topic><topic>Pollution</topic><topic>Pollution, environment geology</topic><topic>Sand & gravel</topic><topic>Scintillation Counting</topic><topic>Silicon Dioxide</topic><topic>Soil and sediments pollution</topic><topic>Soil Pollutants, Radioactive - analysis</topic><topic>Surface chemistry</topic><topic>Uranium</topic><topic>Uranium - chemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Logue, Brian A</creatorcontrib><creatorcontrib>Smith, Robert W</creatorcontrib><creatorcontrib>Westall, John C</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Biotechnology Research Abstracts</collection><collection>Environment Abstracts</collection><collection>Industrial and Applied Microbiology Abstracts (Microbiology A)</collection><collection>Toxicology Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>Environment Abstracts</collection><collection>Pollution Abstracts</collection><jtitle>Environmental science & technology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Logue, Brian A</au><au>Smith, Robert W</au><au>Westall, John C</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Role of Surface Alteration in Determining the Mobility of U(VI) in the Presence of Citrate: Implications for Extraction of U(VI) from Soils</atitle><jtitle>Environmental science & technology</jtitle><addtitle>Environ. Sci. Technol</addtitle><date>2004-07-01</date><risdate>2004</risdate><volume>38</volume><issue>13</issue><spage>3752</spage><epage>3759</epage><pages>3752-3759</pages><issn>0013-936X</issn><eissn>1520-5851</eissn><coden>ESTHAG</coden><abstract>In the present study, the adsorption of U(VI) by a natural iron-rich sand in the presence of citrate was studied over a range of citrate concentrations and pH values. Adsorption of U(VI) on the iron-rich sand decreased in the presence of increasing concentrations of citrate. Adsorption of citrate to the sand was weak under most conditions studied. Several explanations for the adsorption behavior of U(VI) and citrate were investigated, including aqueous complexation of U(VI) by citrate, competition of U(VI) and citrate for adsorption sites, and extraction of Fe and Al from the sorbent surface by citrate (surface alteration). Although aqueous complexation of U(VI) by citrate may still play a significant role, both competitive adsorption and aqueous complexation proved to be inadequate explanations of the adsorption behavior. Both physical surface alteration (i.e., loss of surface area) and chemical surface alteration (i.e., change in the chemical composition of the sand surface) were investigated, with chemical surface alteration controlling the bulk of U(VI) adsorption. Considering these results, remediation schemes that involve organic complexing agents should address the possibility of surface alteration affecting radionuclide adsorption and mobility.</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><pmid>15296329</pmid><doi>10.1021/es0350637</doi><tpages>8</tpages></addata></record> |
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| subjects | Adsorption Aluminum - chemistry Applied sciences Chemical compounds Citric Acid - chemistry Decontamination. Miscellaneous Earth sciences Earth, ocean, space Engineering and environment geology. Geothermics Exact sciences and technology Hydrogen-Ion Concentration Iron Iron - chemistry Mass Spectrometry Models, Chemical Pollution Pollution, environment geology Sand & gravel Scintillation Counting Silicon Dioxide Soil and sediments pollution Soil Pollutants, Radioactive - analysis Surface chemistry Uranium Uranium - chemistry |
| title | Role of Surface Alteration in Determining the Mobility of U(VI) in the Presence of Citrate: Implications for Extraction of U(VI) from Soils |
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