NIMTE OpenIR  > 2018专题
Facile and Efficient Decontamination of Thorium from Rare Earths Based on Selective Selenite Crystallization
Wang, Yaxing; Lu, Huangjie; Xing Dai; Tao Duan; Bai, Xiaojing; Cai, Yawen; Yin, Xuemiao; Chen, Lanhua; Juan Diwu; Du, Shiyu; Zhou, Ruhong; Chai, Zhifang; Albrecht-Schmitt, Thomas E.; Ning Liu; Shuao Wang
2018
Source PublicationINORGANIC CHEMISTRY
Volume57Issue:4Pages:1880-1887
AbstractThe coexistence of radioactive contaminants (e.g., thorium, uranium, and their daughters) in rare earth minerals introduces significant environmental, economic, and technological hurdles in modern rare earth production. Efficient, low cost, and green decontamination strategies are therefore desired to ameliorate this problem. We report here a single-step and quantitative decontamination strategy of thorium from rare earths based on a unique periodic trend in the formation of crystalline selenite compounds across the lanthanide series, where Ce(III) is fully oxidized in situ to Ce(IV). This gives rise to a crystallization system that is highly selective to trap tetravalent f-blocks while all other trivalent lanthanides completely remain in solution when coexist. These results are bolstered by first-principles calculations of lattice energies and an examination of bonding in these compounds. This system is contrasted with typical natural and synthetic systems, where trivalent and tetravalent f-block elements often cocrystallize. The separation factors after one round of crystallization were determined from binary systems of Th(IV)/La(III), Th(IV)/Eu(III), and Th(IV)/Yb(III) to reach 2.1 X 10(5), 1.2 x 10(5), and 9 x 10(4), respectively. Selective crystallization of thorium from a simulated monazite composite yields a separation factor of 1.9 x 10(3) with nearly quantitative removal of thorium.
KeywordGeneralized Gradient Approximation Basis-sets Licl-kcl Separation Elements Density Molecules Uranium Chemistry Pseudopotentials
Subject AreaElectrochemistry
Language英语
Document Type期刊论文
Identifierhttp://ir.nimte.ac.cn/handle/174433/16806
Collection2018专题
Recommended Citation
GB/T 7714
Wang, Yaxing,Lu, Huangjie,Xing Dai,et al. Facile and Efficient Decontamination of Thorium from Rare Earths Based on Selective Selenite Crystallization[J]. INORGANIC CHEMISTRY,2018,57(4):1880-1887.
APA Wang, Yaxing.,Lu, Huangjie.,Xing Dai.,Tao Duan.,Bai, Xiaojing.,...&Shuao Wang.(2018).Facile and Efficient Decontamination of Thorium from Rare Earths Based on Selective Selenite Crystallization.INORGANIC CHEMISTRY,57(4),1880-1887.
MLA Wang, Yaxing,et al."Facile and Efficient Decontamination of Thorium from Rare Earths Based on Selective Selenite Crystallization".INORGANIC CHEMISTRY 57.4(2018):1880-1887.
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