Effect of freeze drying on characteristics of Mg–Al layered double hydroxides and bimetallic oxide synthesis and implications for fluoride sorption

Moriyama, Sayo; Sasaki, Keiko; Hirajima, Tsuyoshi

doi:10.1016/j.clay.2016.07.016

Cited by 22 publications

(13 citation statements)

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“…Mahjoubi et al 20 synthesized zinc aluminum layered double hydroxides intercalated with carbonate, nitrate, chloride, or sulfate via a coprecipitation method. The LDH samples were dried at 60°C for 24 h, and the interlamellar distance d (003) of the ZnAl-CO 3 was found to be 7.57 Å. Moriyama et al 38 obtained different values for the basal spacing d (003) between 7.56 and 7.76 Å, using two drying methods at temperatures below 150 °C. In addition, according to Han et al, 74 parameter “c” also relates the ionic radius of the interlamellar anions to the electrostatic force between these anions and the hydroxyls of the lamellar layer.…”

Section: Resultsmentioning

confidence: 99%

“…The freeze-dried LDHs exhibiting small (nanosized) crystallites had low crystallinity degrees and retained more anions and molecular water. 38 Solid LDH microspheres were fabricated using a spray drying process, and the effects of process conditions were investigated on agglomerate size distribution, morphology, and specific surface area. As a result, the spherical-shaped agglomerates with smooth surfaces without cracks and holes were formed at all drying conditions.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Drying on the Fabrication of MgAl Layered Double Hydroxides

et al. 2021

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This study aimed to evaluate the synthesis of MgAl/LDH from the drying process perspective, evaluating the influence of temperature (75–90 °C) and time (16–20 h) in the drying process. The synthesis was performed, maintaining a ratio of 2:1 of Mg/Al, and the drying was conducted according to a 2 2 experimental design: four axial points and three repetitions at the central point. The surface area and pore diameter ranged from 4.09 to 18.55 m 2 /g and 12.50 to 24.46 nm. Fourier transform infrared (FTIR) analysis indicated the drying-caused variation of the LDH typical bands intensities. Scanning electron microscopy (SEM) images showed the tendency of the increase of agglomeration with the temperature elevation. The drying parameters’ influence was evident for X-ray diffraction (XRD) analysis observing the crystallite size increment, from 13.10 to 38.94 nm, and basal spacing variation, from 7.52 to 7.64 Å. The statistical models for growing crystal and reduction of the basal spacing were physically consistent but with low values of R 2 . The drying time and temperature had a considerable influence on the chemical, physical, structural, and morphological properties of LDH.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Drying on the Fabrication of MgAl Layered Double Hydroxides

et al. 2021

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“…This suggested freeze-drying process interference with the property, as previously reported. 26 The FTIR analysis revealed bands centered at 3445 cm -1 and 1638 cm -1 , which are characterized by an asymmetric axial (ʋOH) and angular (δH 2 O) hydroxyl group deformation corresponding to the adsorbed or interlamellar water molecules. The 2056 cm -1 band corresponds to the CO 2 medium.…”

Section: Discussionmentioning

confidence: 98%

Layered double hydroxides for controlled fluoride release

et al. 2021

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“…Freeze-drying was introduced to obtain nanoparticles with less aggregation. 42) In the present study, freeze-drying was applied for the precipitates (COP-25) and the product was compared with that dried by the solvent replacement with acetone and subsequent vacuum drying. Freeze-dried MgAl-LDH displayed discrete platy particles with the lateral size ca.…”

Section: ¹mentioning

confidence: 99%

Efficient production of MgAl layered double hydroxide nanoparticle

Intasa-Ard

Bureekaew

Ogawa

2019

J. Ceram. Soc. Japan

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A large quantity of MgAl-layered double hydroxide (LDH) nanoparticle was successfully obtained from a single batch from high concentration (as high as 1 M) of metal salts solution. LDH were obtained by the precipitation at room temperature under ambient pressure and subsequent aging. The phase purity, crystallinity, anion composition, and morphology (shape and size of the LDH crystals) were investigated to characterize the products. Chloride type MgAl LDH with well-defined platy shapes of the lateral size of 50 nm was obtained with the very high efficiency (approximately 10 g from the 160 mL of the starting solution).

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Effect of freeze drying on characteristics of Mg–Al layered double hydroxides and bimetallic oxide synthesis and implications for fluoride sorption

Cited by 22 publications

References 50 publications

Effect of Drying on the Fabrication of MgAl Layered Double Hydroxides

Effect of Drying on the Fabrication of MgAl Layered Double Hydroxides

Layered double hydroxides for controlled fluoride release

Efficient production of MgAl layered double hydroxide nanoparticle

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