DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Yun, Jong-Il | - |
dc.contributor.advisor | 윤종일 | - |
dc.contributor.author | Jo, Yongheum | - |
dc.contributor.author | 조용흠 | - |
dc.date.accessioned | 2017-03-29T02:36:15Z | - |
dc.date.available | 2017-03-29T02:36:15Z | - |
dc.date.issued | 2016 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=663417&flag=dissertation | en_US |
dc.identifier.uri | http://hdl.handle.net/10203/221630 | - |
dc.description | 학위논문(석사) - 한국과학기술원 : 원자력및양자공학과, 2016.8 ,[v, 66 p. :] | - |
dc.description.abstract | Aqueous uranyl species coordinating carbonate ligands such as $UO_2(CO_3)_3^{4-}$, $CaUO_2(CO_3)_3^{2-}$, and $Ca_2UO_2(CO_3)_3(aq)$ are predicted to predominant and mobile species in the aquifer of the deep geological repository for nuclear spent fuel. To investigate into the effect of these uranyl carbonate species to U(VI) adsorption, Time-resolved laser fluorescence spectroscopy (TRLFS) was applied to U(VI) surface speciation on alumina, silica, and kaolinite. In prevailing carbonate conditions, the fluorescence spectra of adsorbed U(VI) species onto alumina with blue-shifted emission bands were observed. The deviation to low wavelength is considered as carbonate-like feature found in aqueous uranyl carbonate species and uranyl carbonate minerals that have at least two carbonate ligands as well. The carbonate-like spectral feature indicates uranyl carbonate surface complexation onto alumina. Additionally, the carbonate-like spectral characteristic was found in the aqueous systems where ternary calcium uranyl carbonate species predominantly exist. On the other hand, U(VI)-hydroxo surface complexes on silica and kaolinite surfaces were characterized in spite of the strong abundance of uranyl tricarbonate moiety. In processes of adsorption on both silica and kaolinite, the carbonate ligands may be detached from uranium(VI). Using attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy, the two absorption peaks were observed and the spacing between two peaks indicates that the carbonate ligands complex with uranyl ion in a bidentate-fashion. According to our findings and previous studies, the uranyl carbonate surface complexation tends to be favorable on the surfaces having high point of zero charge $(pH_{pzc})$ such as aluminum and iron oxides. Regarding U(VI) retention in aquifer, the results in this work may provide new insight and comprehensive interpretation of U(VI) adsorption in groundwater system containing abundant carbonate ions. | - |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | Uranyl carbonate surface complexation | - |
dc.subject | Surface U(VI) speciation | - |
dc.subject | Aqueous uranyl carbonate species | - |
dc.subject | Time-resolved laser fluorescence spectroscopy (TRLFS) | - |
dc.subject | Attenuated total reflectance-Fourier transform infrared (ATR-FTIR) | - |
dc.subject | 우라닐 카보네이트 표면 착화합물 반응 | - |
dc.subject | 흡착 우라닐 화학종 | - |
dc.subject | 수용액 카보네이트 우라닐 화학종 | - |
dc.subject | 시간분해 레이저 형광분광법 | - |
dc.subject | 감쇠 전반사 푸리에 변환 적외선 분광법 | - |
dc.title | Adsorption of uranyl carbonate species onto alumina, silica, and kaolinite | - |
dc.title.alternative | 우라닐 카보네이트 화학종의 알루미나, 실리카, 카올리나이트에 대한 흡착특성 규명 | - |
dc.type | Thesis(Master) | - |
dc.identifier.CNRN | 325007 | - |
dc.description.department | 한국과학기술원 :원자력및양자공학과, | - |
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