DC Field | Value | Language |
---|---|---|
dc.contributor.author | Jo, Yongheum | ko |
dc.contributor.author | Kim, Hee-Kyung | ko |
dc.contributor.author | Yun, Jong-Il | ko |
dc.date.accessioned | 2019-10-31T01:20:16Z | - |
dc.date.available | 2019-10-31T01:20:16Z | - |
dc.date.created | 2019-10-08 | - |
dc.date.issued | 2019-10 | - |
dc.identifier.citation | DALTON TRANSACTIONS, v.48, no.39, pp.14769 - 14776 | - |
dc.identifier.issn | 1477-9226 | - |
dc.identifier.uri | http://hdl.handle.net/10203/268067 | - |
dc.description.abstract | The ternary alkaline earth metal uranyl tricarbonate complexes, MnUO2(CO3)(3)(2n-4) (M = Mg and Ca), have been considered to be the major U(vi) species contributing to uranium mobility in natural water. Although MgUO2(CO3)(3)(2-) can account for a substantial portion of U(vi) in a Mg2+-rich aqueous system and most processes regarding uranium are subjected to variable temperatures, chemical thermodynamic data for the prediction of the formation of MgUO2(CO3)(3)(2-) at variable temperatures are still unknown. To fill the knowledge gap in the current chemical thermodynamic database, ultraviolet/visible (UV/Vis) absorption spectroscopy was employed to determine the formation constants (log K ') of MgUO2(CO3)(3)(2-) at varying temperatures of 10-85 degrees C in 0.5 mol kg(-1) NaCl. The formation constants at infinite dilution, log K degrees, were obtained with specific ion interaction theory (SIT), and an increasing tendency of log K degrees with temperature was observed. Using calorimetric titration, the endothermic molar enthalpy of reaction (Delta H-r(m)) of Mg2+ complexation with UO2(CO3)(3)(4-) was determined at 25 degrees C. According to the chemical thermodynamic data obtained in this work, approximation models for the prediction of the temperature-dependent formation constant at a given temperature were examined and the constant enthalpy approximation with modification to the isoelectric reaction showed a satisfactory agreement with our experimental results. Finally, the effects of temperature on U(vi) speciation in Mg2+-rich groundwater and U(vi) extraction from seawater by amidoxime derivatives were examined. For the first time, this work provides important chemical thermodynamic data of MgUO2(CO3)(3)(2n-4) to assess the impact of temperature on U(vi) behaviour in groundwater and seawater. | - |
dc.language | English | - |
dc.publisher | ROYAL SOC CHEMISTRY | - |
dc.title | Complexation of UO2(CO3)(3)(4-) with Mg2+ at varying temperatures and its effect on U(vi) speciation in groundwater and seawater | - |
dc.type | Article | - |
dc.identifier.wosid | 000489155800022 | - |
dc.identifier.scopusid | 2-s2.0-85072994003 | - |
dc.type.rims | ART | - |
dc.citation.volume | 48 | - |
dc.citation.issue | 39 | - |
dc.citation.beginningpage | 14769 | - |
dc.citation.endingpage | 14776 | - |
dc.citation.publicationname | DALTON TRANSACTIONS | - |
dc.identifier.doi | 10.1039/c9dt03313k | - |
dc.contributor.localauthor | Yun, Jong-Il | - |
dc.contributor.nonIdAuthor | Kim, Hee-Kyung | - |
dc.description.isOpenAccess | N | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordPlus | MOLECULAR-DYNAMICS SIMULATION | - |
dc.subject.keywordPlus | FLUORESCENCE SPECTROSCOPY | - |
dc.subject.keywordPlus | CA2UO2(CO3)(3) COMPLEX | - |
dc.subject.keywordPlus | CARBONIC-ACID | - |
dc.subject.keywordPlus | NACL MEDIA | - |
dc.subject.keywordPlus | URANIUM | - |
dc.subject.keywordPlus | CALCIUM | - |
dc.subject.keywordPlus | MAGNESIUM | - |
dc.subject.keywordPlus | RECOVERY | - |
dc.subject.keywordPlus | 0-DEGREES-C | - |
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