Sol-Gel Derived Lanthanide-Substituted Layered Double Hydroxides Mg3/Al1-xLnx

Smalenskaite, A.; Sen, Soma; Salak, Andrei N.; Ferreira, M.G.S.; Beganskienė, Aldona; Kareiva, Aivaras

doi:10.12693/aphyspola.133.884

Cited by 6 publications

(2 citation statements)

References 17 publications

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“…The M II cation is usually magnesium or a 4 th -period transition metal from iron to zinc, and M III is, as a rule, Al, Ga, Fe, or Cr 3 . It has recently been demonstrated that some amount (an order of 10 mol%) of large trivalent cations, namely lanthanides 4–6 and bismuth 7 can substitute M III in the LDH structure. The most used LDHs have the M II /M III cations ratio between 2 and 3, although it can be in the range from 1 to about 5 1 .…”

Section: Introductionmentioning

confidence: 99%

Sonication accelerated formation of Mg-Al-phosphate layered double hydroxide via sol-gel prepared mixed metal oxides

Sokol

Vieira

Žarkov

et al. 2019

Sci Rep

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Single-phase magnesium-aluminium layered double hydroxide (LDH) intercalated with dihydrogen phosphate was successfully produced by hydration of nanopowder of the respective mixed metal oxide (MMO) obtained using sol-gel based method followed by a two-step anion exchange hydroxide-to-chloride and chloride-to-phosphate. The MMO with the metal cation ratio of Mg/Al = 2:1 was prepared using the aqueous sol-gel method. Processes of the parent Mg 2 Al-OH LDH formation and the successive anion-exchanges, ОН − → Cl − and Cl − → H 2 PO 4 − , were considerably accelerated via the application of high-power (1.5 kW) ultrasound. The crystalline phases formed at all stages of the Mg 2 Al-H 2 PO 4 LDH production were characterized using X-ray diffraction, scanning electron microscopy, scanning transmission electron microscopy, inductive coupled plasma optical emission spectroscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis. Based on the data of chemical analysis and the XRD data, the type of the intercalated phosphate anion was determined and the arrangement of this anion in the interlayer was modelled.

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Section: Introductionmentioning

confidence: 99%

Sonication accelerated formation of Mg-Al-phosphate layered double hydroxide via sol-gel prepared mixed metal oxides

Sokol

Vieira

Žarkov

et al. 2019

Sci Rep

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show abstract

“…The number of different octahedrally coordinated cations that can be introduced in the brucite-like layers is theoretically unlimited as long as the ionic radius is in the range of 0.65–0.80 Å and 0.62–0.69 Å for the trivalent and divalent cation, respectively, although the most common trivalent Al 3+ is significantly smaller (0.50 Å). However, cations with larger ionic radii and/or higher coordination, such as lanthanides or noble metal cations as well as tetravalent cations (e. g. Zr 4+ , Sn 4+ , and Ti 4+ ), have been introduced in M 2+ M n+ -LDHs or in multicationic LDHs containing a large number of divalent and/or trivalent cations [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Composition Effect on the Formation of Oxide Phases by Thermal Decomposition of CuNiM(III) Layered Double Hydroxides with M(III) = Al, Fe

Awan,

Ho,

Beltrami

et al. 2023

Materials

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The thermal decomposition processes of coprecipitated Cu-Ni-Al and Cu-Ni-Fe hydroxides and the formation of the mixed oxide phases were followed by thermogravimetry and derivative thermogravimetry analysis (TG – DTG) and in situ X-ray diffraction (XRD) in a temperature range from 25 to 800 °C. The as-prepared samples exhibited layered double hydroxide (LDH) with a rhombohedral structure for the Ni-richer Al- and Fe-bearing LDHs and a monoclinic structure for the CuAl LDH. Direct precipitation of CuO was also observed for the Cu-richest Fe-bearing samples. After the collapse of the LDHs, dehydration, dehydroxylation, and decarbonation occurred with an overlapping of these events to an extent, depending on the structure and composition, being more pronounced for the Fe-bearing rhombohedral LDHs and the monoclinic LDH. The Fe-bearing amorphous phases showed higher reactivity than the Al-bearing ones toward the crystallization of the mixed oxide phases. This reactivity was improved as the amount of embedded divalent cations increased. Moreover, the influence of copper was effective at a lower content than that of nickel.

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Alkaline earth metal substitution effects in sol-gel–derived mixed metal oxides and Mg2-xMx/Al1 (M = Ca, Sr, Ba)–layered double hydroxides

Valeikiene

Grigoravičiūtė-Puronienė

Kareiva

2020

J Aust Ceram Soc

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Sol-Gel Derived Lanthanide-Substituted Layered Double Hydroxides Mg₃/Al_1-xLn_x

Cited by 6 publications

References 17 publications

Sonication accelerated formation of Mg-Al-phosphate layered double hydroxide via sol-gel prepared mixed metal oxides

Sonication accelerated formation of Mg-Al-phosphate layered double hydroxide via sol-gel prepared mixed metal oxides

Composition Effect on the Formation of Oxide Phases by Thermal Decomposition of CuNiM(III) Layered Double Hydroxides with M(III) = Al, Fe

Alkaline earth metal substitution effects in sol-gel–derived mixed metal oxides and Mg2-xMx/Al1 (M = Ca, Sr, Ba)–layered double hydroxides

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