Effect of the Synthesis Method on the Phase Composition and Magnetism of Layered Double Hydroxides

Nestroinia, O. V.; Рыльцова, И. Г.; Yapryntsev, M. N.; Lebedeva, O. E.

doi:10.1134/s0020168520070109

Cited by 6 publications

(4 citation statements)

References 18 publications

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“…The XRD confi rmed the predominance of hydrotalcitestructured layered double hydroxides, as well as the presence of a spinel-structured (CoFe 2 O 4 ) phase, in the synthesized samples [17]. All the samples are attracted to a magnet as integral materials, with no separation into individual structural elements either in air-dry samples or in aqueous solutions.…”

Section: Resultsmentioning

confidence: 86%

“…The prepared samples proved to have magnetic properties at room temperature and be able to act as effective sorbents to remove anionic dyes from solutions [16]. The phase composition of the samples showed that their magnetism results from the presence of a spinel-structured (CoFe 2 O 4 ) impurity phase [17], i.e., that the synthesis produces composite materials.…”

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confidence: 99%

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Magnetic Materials Based on Layered Double Hydroxides

et al. 2021

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Composite materials that contain tetracationic hydrotalcite-like layered double hydroxide and a cobalt-iron spinel phase were prepared by coprecipitation from a solution of a mixture of magnesium, aluminum, cobalt(II), and iron(III) salts followed by hydrothermal treatment. The iron and cobalt contents in the samples were varied within a broad range. The thermal transformations of the prepared composites were examined by hightemperature X-ray diffraction, and the layered hydroxide phase was found to remain when heated up to 300°C. The specifi c magnetization and magnetic susceptibility of the materials were determined using a vibrating sample magnetometer; a rise in the iron and cobalt contents was found to increase the magnetization up to a certain limit. The obtained samples can be used as magnetic sorbents. The sorption capacity of materials was estimated using Congo red anionic dye as an example.

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Section: Resultsmentioning

confidence: 86%

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confidence: 99%

Magnetic Materials Based on Layered Double Hydroxides

et al. 2021

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“…LDH or other hydrotalcite-like compounds have a distinct layered structure and general formula [M 2+ 1−x M 3+ x (OH) 2 ] x+ (A n− ) x\n •mH 2 O, where M 2+ -divalent metal, M 3+ -trivalent metal, located in octahedral positions of brucite-like layers, and A n--anion, compensating the positive charge of brucite-like layers [6]. The formation of the hydrotalcite phase occurs provided that the x value lies in the range of 0.2-0.4, and the radii of the cations forming brucite-like layers do not differ by more than 1.5 times.…”

Section: Introductionmentioning

confidence: 99%

Mesoporous Layered Double Hydroxides: Synthesis for High Effective Uranium Ions Sorption from Seawater and Salt Solutions on Nanocomposite Functional Materials

Balybina,

Dran’kov,

Shichalin

et al. 2023

J. Compos. Sci.

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A series of sorption materials based on layered double hydroxides (Co-Fe LDH, Ni-Fe LDH, and Zn-Ti LDH) were obtained by a facile and environmentally friendly method of coprecipitation. A low particle size of no more than 10 µm was achieved. The use of transition metals makes it possible to obtain compounds that are mechanically and chemically stable in aggressive environments. XRD analysis revealed that the compounds have a highly organized crystalline structure. Using SEM, it was determined that Co-Fe LDH and Ni-Fe LDH had a loose, highly dispersed surface structure, while Zn-Ti LDH had a monolithic surface structure. U(VI) adsorption on the obtained materials in solutions containing Na2CO3, Na2SO4, KNO3, NaCl, K3PO4, and NaHCO3, was studied in batch mode. The degree of purification in the presence of these salts reached 99.9%, while the distribution coefficient Kd reached 105 mL/g. Sorption capacity qmax and equilibrium adsorption constants Kf and KL for U(VI) adsorption in batch mode (for 24 h) from distilled and seawater were determined using the Freundlich and Langmuir equations. The highest sorption capacity of 101.6 mg/g in seawater and 114.1 mg/g in distilled water was registered for Co-Fe-LDH. The presence of competing ions in seawater can reduce sorption efficiency by up to 40%. The provided research allowed us to conclude that the obtained materials, Co-Fe LDH, Ni-Fe LDH, and Zn-Ti LDH are promising for the sorption removal of U(VI) from aqueous media of medium salinity.

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“…, where M 2+ and M 3+ are metal ions located in octahedral positions of brucite-like layers, and A n− stands for inorganic or organic anions that compensate the positive charge of brucite-like layers [1,2]. The structural features of hydrotalcite-like compounds give them a number of specific ion-exchange [3][4][5], sorption [6][7][8], electrical [9][10][11], catalytic [12][13][14], and magnetic properties [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Effect of Synthesis Method on Properties of Layered Double Hydroxides Containing Ni(III)

2021

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Unstable oxidation state +3 of nickel can be stabilized in the structure of layered double hydroxides, the resulting crystallinity and properties being dependent on the synthesis method. Three different wet chemical methods (co-precipitation at variable pH, co-precipitation followed by hydrothermal treatment, co-precipitation with microwave treatment) were used to synthesize Mg/Ni–Al layered double hydroxides containing triply charged nickel cations. Lattice parameters of the samples synthesized by various methods were found to differ from each other by about 1.5%. The most crystallized sample was obtained by hydrothermal synthesis. The oxidation state of nickel in the LDH samples was confirmed by XPS. TEM mapping gave evidence of the uniform distribution of nickel in all the samples. The LDHs’ reduction with hydrogen and thermal transformations of the phase composition and morphology of LDHs were studied in detail. The properties of the samples synthesized by the different methods were shown to be quite similar.

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Effect of the Synthesis Method on the Phase Composition and Magnetism of Layered Double Hydroxides

Cited by 6 publications

References 18 publications

Magnetic Materials Based on Layered Double Hydroxides

Magnetic Materials Based on Layered Double Hydroxides

Mesoporous Layered Double Hydroxides: Synthesis for High Effective Uranium Ions Sorption from Seawater and Salt Solutions on Nanocomposite Functional Materials

Effect of Synthesis Method on Properties of Layered Double Hydroxides Containing Ni(III)

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