DC Field | Value | Language |
---|---|---|
dc.contributor.author | Yoon, Inhak | ko |
dc.contributor.author | Cha, Wansik | ko |
dc.contributor.author | Choi, Seonggyu | ko |
dc.contributor.author | Cho, Hyejin | ko |
dc.contributor.author | Cho, Hye-Ryun | ko |
dc.contributor.author | Yun, Jong-Il | ko |
dc.date.accessioned | 2023-11-06T07:00:08Z | - |
dc.date.available | 2023-11-06T07:00:08Z | - |
dc.date.created | 2023-11-06 | - |
dc.date.created | 2023-11-06 | - |
dc.date.issued | 2023-11 | - |
dc.identifier.citation | SURFACES AND INTERFACES, v.42 | - |
dc.identifier.issn | 2468-0230 | - |
dc.identifier.uri | http://hdl.handle.net/10203/314311 | - |
dc.description.abstract | The colloidal stability of uranium(IV) nanoparticles (U(IV)-NPs), which influences the subsurface U migration from contaminated sites, can be altered by the adsorption of natural organic matters possessing surface-binding groups, such as catechols. Therefore, in this study, the effects of catechol binding groups on the colloidal stability and surface chemistry of U(IV)-NPs in anoxic aqueous solutions were probed using 4-nitrocatechol (nCA) over a wide pH range. Multiple complementary investigations including ζ-potential measurements, controlled acid–base titration, adsorption isotherm analysis, and surface complexation modeling revealed that nCA significantly modified the colloidal behavior of the intact U(IV)-NPs—which were stable only in acidic solutions (pH ∼2)—by shifting the isoelectric point to a lower-pH region in a concentration-dependent manner via strong adsorption complying the Langmuir isotherm model. Interestingly, the nCA-containing colloidal solutions stabilized at high pH and enabled U(IV)-NP redispersion. This colloidal behavior originated from the protonation/deprotonation capability of [tbnd]UOH sites on UO2(cr)-like primary particles, as evidenced by the two pKa values determined using the surface ionization model (5.0 ± 0.6 and 7.4 ± 0.7), as well as the strong inner-sphere and mixed monodentate/bidentate complex formation with nCA, as signified by the observed surface-enhanced infrared absorption effects and one- or two-site complexation modeling results. | - |
dc.language | English | - |
dc.publisher | ELSEVIER | - |
dc.title | Colloidal stability and surface chemistry of aqueous tetravalent uranium nanoparticles: Effects of 4-nitrocatechol adsorption | - |
dc.type | Article | - |
dc.identifier.wosid | 001092773300001 | - |
dc.identifier.scopusid | 2-s2.0-85173973586 | - |
dc.type.rims | ART | - |
dc.citation.volume | 42 | - |
dc.citation.publicationname | SURFACES AND INTERFACES | - |
dc.identifier.doi | 10.1016/j.surfin.2023.103458 | - |
dc.contributor.localauthor | Yun, Jong-Il | - |
dc.contributor.nonIdAuthor | Yoon, Inhak | - |
dc.contributor.nonIdAuthor | Cha, Wansik | - |
dc.contributor.nonIdAuthor | Choi, Seonggyu | - |
dc.contributor.nonIdAuthor | Cho, Hyejin | - |
dc.contributor.nonIdAuthor | Cho, Hye-Ryun | - |
dc.description.isOpenAccess | N | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | U(IV) nanoparticles | - |
dc.subject.keywordAuthor | Colloidal stability | - |
dc.subject.keywordAuthor | 4-Nitrocatechol | - |
dc.subject.keywordAuthor | Surface complexation model | - |
dc.subject.keywordAuthor | Langmuir adsorption isotherms | - |
dc.subject.keywordAuthor | Surface-enhanced infrared absorption (SEIRA) | - |
dc.subject.keywordPlus | METAL (HYDR)OXIDE/WATER INTERFACE | - |
dc.subject.keywordPlus | INFRARED-ABSORPTION SPECTROSCOPY | - |
dc.subject.keywordPlus | WATER INTERFACE | - |
dc.subject.keywordPlus | ANATASE NANOPARTICLES | - |
dc.subject.keywordPlus | UO2 OXIDATION | - |
dc.subject.keywordPlus | HUMIC-ACID | - |
dc.subject.keywordPlus | CATECHOL | - |
dc.subject.keywordPlus | COMPLEXATION | - |
dc.subject.keywordPlus | REDUCTION | - |
dc.subject.keywordPlus | SUBSTITUENTS | - |
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