Sorption of uranium(VI) with functionalized CMK-3 under acidic and seawater condition = 기능화된 CMK-3의 강산 및 해수 환경에서 우라늄(VI) 흡착특성 연구

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Uranium extraction has been widely studied for (i) the uranium recovery for nuclear fuel resource and nuclear waste management; and (ii) the uranium deficiency in geological deposits. Sorption is one of the most promising technologies for extracting uranium. To investigate effective sorption material, the ordered mesoporous carbon (CMK-3) was functionalized with phosphate ligands and amidoxime ligands. The phosphorylated CMK-3 and amidoximed CMK-3 were applied for sorption of U(VI) under highly acidic condition and seawater condition, respectively. Under highly acidic condition (1-2 M $HNO_3$), CMK-3-Bz-$PO_4$ exhibited the highest U(VI) sorption (10.6 mg/g) due to the electron donating effect of the benzene ring providing more negative charge toward phosphoryl oxygen which is the binding site for U(VI). On the other hand, in pH 1-4 range, CMK-3-Et-PO4 and CMK-3-Py-$PO_4$ had a conspicuous increase in sorption performance due to the electron withdrawing effects of ethyl amide and pyridine when enhancing the acidities of functional groups. CMK-3-An-AO exhibited a maximum U(VI) sorption capacity under seawater condition (170 $\mu$g/g) because the amine group onto An-AO improved the overall complexation between amidoxime and U(VI). Electron withdrawing effect of the amine group lowered the charge on U(VI) in the complex through hydrogen bonding with the water molecules surrounding U(VI). According to the findings of this work, the results provide a promising platform for the development of functionalized carbon sorbents for U(VI) extraction from spent nuclear fuels or seawater.
Advisors
Yun, Jong-Ilresearcher윤종일researcher
Description
한국과학기술원 :원자력및양자공학과,
Publisher
한국과학기술원
Issue Date
2019
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 원자력및양자공학과, 2019.2,[v, 52 p. :]

Keywords

U(VI) extraction▼aordered mesoporous carbon▼aphosphate▼aamidoxime▼asorption; 우라늄 추출▼a흡착▼a메조다공성 탄소분자체▼a인산▼a아미독심

URI
http://hdl.handle.net/10203/266554
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=843346&flag=dissertation
Appears in Collection
NE-Theses_Master(석사논문)
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