A time resolved, in-situ X-ray diffraction study of the de-intercalation of anions and lithium cations from [LiAl2(OH)6]nX·qH2O (X = Cl−, Br−, NO3−, SO42−)

Тарасов, К. А.; Исупов, В. П.; Chupakhina, L. E.; O’Hare, Dermot

doi:10.1039/b314473a

Cited by 58 publications

(36 citation statements)

References 25 publications

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“…It appears that the rate constant for Li + de-intercalation from Li/Al LDH, with Cl − as the interlayer anion, increased as the reaction temperature increased. At 90 • C, the kinetic constant reached 65.1 × 10 −4 s −1 , which was two-to three-fold higher than the values reported by Tarasov et al [32], using the same temperature and interlayer anions. This discrepancy is probably due to the high water/LDH ratio of 1000 (g g −1 ) used in the current study, compared with that of 50 (g g −1 ) used by Tarasov et al [32].…”

Section: Chromium(vi) Release and LI + De-intercalationcontrasting

confidence: 62%

“…At 90 • C, the kinetic constant reached 65.1 × 10 −4 s −1 , which was two-to three-fold higher than the values reported by Tarasov et al [32], using the same temperature and interlayer anions. This discrepancy is probably due to the high water/LDH ratio of 1000 (g g −1 ) used in the current study, compared with that of 50 (g g −1 ) used by Tarasov et al [32]. With Cr(VI) as the interlayer anion, Li + de-intercalation from Li/Al LDH also occurs relative to reaction temperature (Table 2).…”

Section: Chromium(vi) Release and LI + De-intercalationcontrasting

confidence: 62%

“…Two possible explanations exist for this phenomenon. (1) First, de-intercalation of Li + and Cl − from Li/Al LDH has been reported previously [26,32]. This property led to decreases in both the positive charges and the anion-exchange capacity of Li/Al LDH.…”

Section: Effect Of Temperature On Cr(vi) Adsorption Kinetics and Capamentioning

confidence: 89%

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The removal and recovery of Cr(VI) by Li/Al layered double hydroxide (LDH)

Hsu

Wang

Tzou

et al. 2007

Journal of Hazardous Materials

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Section: Chromium(vi) Release and LI + De-intercalationcontrasting

confidence: 62%

Section: Chromium(vi) Release and LI + De-intercalationcontrasting

confidence: 62%

See 1 more Smart Citation

The removal and recovery of Cr(VI) by Li/Al layered double hydroxide (LDH)

Hsu

Wang

Tzou

et al. 2007

Journal of Hazardous Materials

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“…In this case the idealized formula of the solid is [LiAl 2 (OH) 6 ]Cl.1.5H 2 O and the maximum lithium concentration should be 3.1 wt% [e.g. (Tarasov et al, 2004)]. As shown in Fig.…”

Section: Quantifying Isotope Fractionationmentioning

confidence: 99%

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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“…Wastewater with a high level of fluoride is often discharged from mines, semiconductor factories, electroplating, rubber and fertilizer manufacturing. [15][16][17][18] The calcined LDHs (denoted as CLDHs) have been demonstrated to reconstruct the original layered structures upon immersion in anion aqueous solutions via an unusual ''memory effect''. A range of treatment technologies including chemical precipitation, 4,5 ion exchange, 6 adsorption, 7,8 and electrolysis 9 have been attempted for the removal of fluoride species from water.…”

Section: Introductionmentioning

confidence: 99%

Hierarchically porous calcined lithium/aluminum layered double hydroxides: Facile synthesis and enhanced adsorption towards fluoride in water

et al. 2011

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Lithium/aluminum layered double hydroxides (Li/Al-LDHs) were synthesized via a facile hydrothermal route, using lithium and aluminum chloride mixed solutions with various molar ratios (Li + /Al 3+ ¼ 2, 3, 4, 5) as precursors and urea as a precipitating agent. The structure, morphology, and textural properties of the calcined Li/Al-LDHs (Li/Al-CLDHs) were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy, and nitrogen adsorption-desorption. It was found that the threedimensional petal-like Li/Al-CLDHs assemblies were constructed from hexagonal nanosheets with different sizes. The Li/Al-CLDHs contain three types of hierarchical porous organization such as small mesopores (ca. 4.5-10 nm), large mesopores (ca. 40-50 nm) and macropores (ca. 200-500 nm). The asprepared Li/Al-CLDHs samples exhibit excellent adsorption capacity of 158.7 mg g À1 towards fluoride species in water. Thermodynamic and kinetic studies revealed that the adsorption process was spontaneous and endothermic in nature. Analyses by X-ray photoelectron spectroscopy confirmed that fluoride is distributed in the layer channel by ion exchange, physical adsorption as well as insertion into the host layer lattice during the rehydration process. The superior sorption capacity of Li/Al-CLDHs is attributed to the unique hierarchically porous structures and high specific surface areas.

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A time resolved, in-situ X-ray diffraction study of the de-intercalation of anions and lithium cations from [LiAl₂(OH)₆]_nX·qH₂O (X = Cl⁻, Br⁻, NO₃⁻, SO₄²⁻)

Cited by 58 publications

References 25 publications

The removal and recovery of Cr(VI) by Li/Al layered double hydroxide (LDH)

The removal and recovery of Cr(VI) by Li/Al layered double hydroxide (LDH)

Lithium isotope fractionation during uptake by gibbsite

Hierarchically porous calcined lithium/aluminum layered double hydroxides: Facile synthesis and enhanced adsorption towards fluoride in water

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