Lithium isotope separation on a monobenzo-15-crown-5 resin

Kim, D. W.; Jeon, Young Shin; Eom, Tae Yoon; Suh, Moo Yul; Lee, C. H.

doi:10.1007/bf02035328

Cited by 54 publications

(11 citation statements)

References 14 publications

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“…Similar fractionation factors were also estimated from natural studies of lithium in seafloor basalt, Fe-Mn crusts and Fe-oxyhydroxides (Chan et al, 1992; Chan and Hein, 2007;Wimpenny et al, 2010b) and experimental studies determining the fractionation of lithium during uptake into gibbsite, kaolinite, vermiculite, illite and smectite (Brenot et al, 2008;Zhang et al, 1998;Pistiner and Henderson, 2003; Williams and Hervig, 2005). The fractionation factor (a solid-solution ) depends on both mineral type and temperature (Brenot et al, 2008;Taylor and Urey, Kim et al (1991) Monobenzo-15-crown-5 5% H 2 O in acetonitrile 0.947 6 Li 23 Kim et al (1995) Dibenzo pyridino diamide azacrown (DBPDA) Acetonitrile 0.966 6 Li 20 Kim et al (1997) Cyclic triazatetramerrifield resin 1 M NH 4 Cl 0.932 6 Li 20 Kim et al (1998) Azacrown tetramerrifield peptide resin 0.5 M NH 4 Cl 1.00127 7 Li 25 Kim et al (1998) NTOE 0.01 M HCl 1.0242 7 Li 25 Kim et al (1999) N 4 O 2 azacrown 0.01 M NH 4 Cl 1.038 Unclear 20 Kim et al (2000) Amino benzo-15-crown-5 1 M NH 4 Cl 1.026 7 Li 20 Nishizawa and Watanabe (1986) Cryptand (2B,2,1) 0.959 6 Li Room temp. Nishizawa et al (1984) Benzo-15-crown-5 0.965-0.998 6 Li Room temp.…”

Section: Studies Of Lithium-isotope Fractionationmentioning

confidence: 97%

Lithium isotope fractionation during uptake by gibbsite

Wimpenny

Colla

Yu³

et al. 2015

Geochimica et Cosmochimica Acta

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The intercalation of lithium from solution into the six-membered l 2 -oxo rings on the basal planes of gibbsite is well-constrained chemically. The product is a lithiated layered-double hydroxide solid that forms via in situ phase change. The reaction has well established kinetics and is associated with a distinct swelling of the gibbsite as counter ions enter the interlayer to balance the charge of lithiation. Lithium reacts to fill a fixed and well identifiable crystallographic site and has no solvation waters. Our lithium-isotope data shows that 6 Li is favored during this intercalation and that the solid-solution fractionation depends on temperature, electrolyte concentration and counter ion identity (whether Cl À , NO 3 À or ClO 4 À ). We find that the amount of isotopic fractionation between solid and solution (DLi solid-solution ) varies with the amount of lithium taken up into the gibbsite structure, which itself depends upon the extent of conversion and also varies with electrolyte concentration and in the counter ion in the order: ClO 4 À < NO 3 À < Cl À . Higher electrolyte concentrations cause more rapid expansion of the gibbsite interlayer and some counter ions, such as Cl À , are more easily taken up than others, probably because they ease diffusion. The relationship between lithium loading and DLi solid-solution indicates two stages:(1) uptake into the crystallographic sites that favors light lithium, in parallel with adsorption of solvated cations, and (2) continued uptake of solvated cations after all available octahedral vacancies are filled; this second stage has no isotopic preference. The two-step reaction progress is supported by solid-state NMR spectra that clearly resolve a second reservoir of lithium in addition to the expected layered double-hydroxide phase.

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Section: Studies Of Lithium-isotope Fractionationmentioning

confidence: 97%

Lithium isotope fractionation during uptake by gibbsite

Wimpenny

Colla

Yu³

et al. 2015

Geochimica et Cosmochimica Acta

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“…The isotope exchange of metal elements on crown ether is expected to have the high separation coefficient in comparison to other chemical reaction. [1][2][3][4][5][6][7][8] The many isotope separation experiments based on complex formation of metal ions with crown ether were carried out using the liquid-liquid extraction 1,2) or the extraction chromatography. 3,4) The liquid-liquid extraction is difficult to commercially separate the isotopes, because the distribution coefficient is too small and the establishment of the multi-stage process is difficult.…”

Section: Introductionmentioning

confidence: 99%

Novel Syntheses Method of Phenol Type Benzo-15-Crown-5 Ether Resin and its Application for Lithium Isotope Separation

OTAKE¹,

Suzuki²,

KIM³

et al. 2006

J. Nucl. Sci. Technol.

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The novel synthesis method of phenol type benzo-15-crown-5 ether resin was proposed. The chemical bonding of benzo-crown ether and phenol was succeeded by using hexamethylenetetramine and trichloroacetic acid as the condensing agent and solvent, respectively. The control of the diameter and shape of resin was also succeeded by using the high porous silica beads support. The isotope fractionation by chromatography using the synthesized resin was confirmed. The lighter isotope was disproportionately located in the crown ether resin. The separation coefficient, ", in the present system was 0.033.

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“…Recently, another lithium isotopic fractionation compounds were investigated such as cryptand resins, crown and azacrown ethers, Dowex resins, NTOE compounds, DTDM-TTTM and manganese oxides [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] (Table 1).…”

Section: LI Enrichment Techniquesmentioning

confidence: 99%