DC Field | Value | Language |
---|---|---|
dc.contributor.author | Wang, Guohui | - |
dc.contributor.author | Kim, Dong-Sang | - |
dc.contributor.author | Olszta, Matthew J. | - |
dc.contributor.author | Bowden, Mark E. | - |
dc.contributor.author | Schreiber, Daniel K. | - |
dc.contributor.author | Saslow, Sarah A. | - |
dc.contributor.author | Um, Wooyong | - |
dc.contributor.author | Riley, Brian J. | - |
dc.contributor.author | Wang, Jing | - |
dc.contributor.author | Kruger, Albert A. | - |
dc.date.accessioned | 2022-03-04T08:40:06Z | - |
dc.date.available | 2022-03-04T08:40:06Z | - |
dc.date.created | 2022-01-07 | - |
dc.date.issued | 2022-03-05 | - |
dc.identifier.issn | 0304-3894 | - |
dc.identifier.uri | https://oasis.postech.ac.kr/handle/2014.oak/110529 | - |
dc.description.abstract | © 2021This study investigates the impacts of Ni doping on technetium-99 (Tc) sequestration in aqueous solutions through transformation of Fe(OH)2(s) to iron spinel (magnetite) under alkaline conditions. Extensive solid characterization was performed for the mineral phases produced, as well as the Tc/Ni speciation and distribution within these phases. X-ray diffraction results show that iron spinel was the dominant mineral product without detectable Ni incorporation. The doped Ni ions mainly precipitated as fine Fe/Ni oxide/hydroxide particles, including strongly reduced nanometer˗sized spheroidal Ni-rich and metallic Ni phases. High-resolution analytical scanning transmission electron microscopy using energy dispersive X-ray spectroscopy and electron energy loss spectroscopy on the produced solid samples (focused ion beam-prepared specimens) revealed three Tc distribution domains dominated by nanocrystals and, especially, a Tc-rich metallic phase. Instances of metallic Tc were specifically found in spheroidal, Ni-rich and metallic nanoparticles exhibiting a core/shell microstructure that suggests strong reduction and sequential precipitation of Ni-Tc-Ni. Mass balance analysis showed nearly 100% Tc removal from the 4.8 × 10−4 M Tc solutions. The finding of the metallic Tc encapsulation indicates that Tc sequestration through Ni-doped Fe(OH)2(s)˗to˗iron spinel transformation process likely provides an alternative treatment pathway for Tc removal and could be combined into further waste treatment approaches. | - |
dc.language | English | - |
dc.publisher | Elsevier B.V. | - |
dc.relation.isPartOf | Journal of Hazardous Materials | - |
dc.title | Metallic technetium sequestration in nickel core/shell microstructure during Fe(OH)2 transformation with Ni doping | - |
dc.type | Article | - |
dc.identifier.doi | 10.1016/j.jhazmat.2021.127779 | - |
dc.type.rims | ART | - |
dc.identifier.bibliographicCitation | Journal of Hazardous Materials, v.425 | - |
dc.identifier.wosid | 000752501400004 | - |
dc.citation.title | Journal of Hazardous Materials | - |
dc.citation.volume | 425 | - |
dc.contributor.affiliatedAuthor | Um, Wooyong | - |
dc.identifier.scopusid | 2-s2.0-85119583614 | - |
dc.description.journalClass | 1 | - |
dc.description.journalClass | 1 | - |
dc.description.isOpenAccess | N | - |
dc.type.docType | Article | - |
dc.subject.keywordPlus | MAGNETITE PARTICLES | - |
dc.subject.keywordPlus | ELECTRON-MICROSCOPY | - |
dc.subject.keywordPlus | IRON-OXIDES | - |
dc.subject.keywordPlus | REDUCTION | - |
dc.subject.keywordPlus | REMOVAL | - |
dc.subject.keywordPlus | PERTECHNETATE | - |
dc.subject.keywordPlus | MECHANISM | - |
dc.subject.keywordPlus | OXIDATION | - |
dc.subject.keywordPlus | TC-99 | - |
dc.subject.keywordPlus | ION | - |
dc.subject.keywordAuthor | Iron spinel | - |
dc.subject.keywordAuthor | Metallic technetium | - |
dc.subject.keywordAuthor | Ni doping | - |
dc.subject.keywordAuthor | Radioactive waste | - |
dc.subject.keywordAuthor | Sequestration | - |
dc.relation.journalWebOfScienceCategory | Engineering, Environmental | - |
dc.relation.journalWebOfScienceCategory | Environmental Sciences | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Engineering | - |
dc.relation.journalResearchArea | Environmental Sciences & Ecology | - |
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