Layered double hydroxides are still out in the bloom: Syntheses, applications and advantages of three-dimensional flower-like structures

Boccalon, Elisa; Gorrasi, Giuliana; Nocchetti, Morena

doi:10.1016/j.cis.2020.102284

Cited by 49 publications

(19 citation statements)

References 94 publications

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“…Analogously, the primary particles had a diameter of approximately 20 nm, in good agreement with the present results of Figure 4 b. FESEM analysis of the LDH ( Figure 4 c,d) reveals that the same compound exhibits different microstructures at different magnification levels, due to a different ratio of nanostructuration, globular and flower-like in shape. These morphologies are typically dependent on the synthesis pathway adopted, whose pH has a key role [ 47 ].…”

Section: Resultsmentioning

confidence: 99%

ZnAl-SO4 Layered Double Hydroxide and Allophane for Cr(VI), Cu(II) and Fe(III) Adsorption in Wastewater: Structure Comparison and Synergistic Effects

et al. 2022

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Owing to their structure, layered double hydroxides (LDHs) and allophane are nowadays considered as promising materials for application in different fields. The goal of this work is to compare the efficacy of allophane and ZnAl-SO4 LDH to remove, by adsorption, some cationic and anionic pollutants from industrial wastewater. Both compounds were synthesized via the co-precipitation route (direct method) followed by hydrothermal treatment, obtaining nanoscopic crystallites with a partially disordered turbostratic (ZnAl-SO4 LDH) or amorphous (allophane) structure. The characterization of the obtained compounds was performed by means of powder x-ray diffraction (PXRD), thermal gravimetry analysis (TGA), field emission scanning electron microscopy analysis (FESEM), and Fourier-transform infrared spectroscopy (FT-IR). The sorbents were tested using wastewater produced by a real metalworking plant and containing ionic species such as Cu(II), Fe(III) and Cr(VI), whose concentration was measured by means of inductively coupled plasma-optical emission spectrometry (ICP-OES). This investigation represents an alternative procedure with respect to standard protocols based on customarily made and artificially lab-produced wastewaters. Both sorbents and their combination proved to be efficient in Cr(VI) removal, irrespective of the presence of cations like Cu(II) and Fe(III). A synergistic effect was detected for Cu(II) adsorption in a mixed allophane/LDH sorbent, leading to a Cu(II) removal rate of 89.5%.

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Section: Resultsmentioning

confidence: 99%

ZnAl-SO4 Layered Double Hydroxide and Allophane for Cr(VI), Cu(II) and Fe(III) Adsorption in Wastewater: Structure Comparison and Synergistic Effects

et al. 2022

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“…Due to the grains have the slowest growth velocity along the direction of < 001 >, the formation of SnO crystals mainly exhibits a (001) face [12] . synthesis is not only a solvent, but also a surfactant [13] .…”

Section: Resultsmentioning

confidence: 99%

“…The petals aggregated in oleyamine to assemble into hollow flower-like SnO nanostructure. The role of oleyamine in the synthesis is not only a solvent, but also a surfactant [13] .…”

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Hollow Flower-Like SnO and Applications in Lithium Ion Batteries

Guo¹,

et al. 2021

Preprint

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Novel hollow flower-like SnO structures have been successfully synthesized by using a facile solvothermal method approach, which injecting LiN(SiMe3)2 to the solution of SnCl2 and oleamine. The as-synthesized hollow flower-like SnO structures were aggregated by ultrathin SnO nanosheets with large surface area and exhibit narrow size distribution of ~2.0 µm. The electrochemical performance of hollow flower-like SnO structures were examined as an anode material in coin cells for lithium-ion batteries. It demonstrates excellent lithium ion batteries performance as characterized by the cycling stability, specific capacity, cyclic voltammetry and rate performance. The measured discharge capacity is 361.4 mAh g-1 after 50 charge/discharge cycles with 46% capacity retention, which indicated a improving in cyclic stability. This result demonstrated that the specific hollow structure has great potential as the electrodes for lithium ion batteries. This work may provide an attractive road to synthesize other hollow-flower structures of transition metal oxides.

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“…2 FT-IR spectra of MgAl-CO 3 hydrotalcite-based compounds prepared via a urea assisted hydrothermal synthesis. The 3D architecture of the compound is the preferred one for different fields of use, due to a high exchanged surface available [53]. The thickness of the constituent lamellae was estimated between 10 and 20 nm.…”

Section: Structural (Xrdp) and Morphological (Fesem) Analysismentioning

confidence: 99%

Thermal behavior and antibacterial studies of a carbonate Mg–Al-based layered double hydroxide (LDH) for in vivo uses

Cardinale

Ciprioti

Fortunato

et al. 2022

J Therm Anal Calorim

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The goal of this work is to study the thermal behavior and the antibacterial properties of a MgAl-CO3 layered double hydroxide (LDH), which demonstrated high efficiency in removing chromium (VI) from contaminated industrial wastewater. The compound has been synthesized via co-precipitation route (direct method) followed by hydrothermal treatment, obtaining nanoscopic crystallites with a partially disordered (turbostratic) structure. After its synthesis, the compound was characterized by means of X-ray powder diffraction, field emission scanning electron microscope, inductively coupled plasma atomic emission spectroscopy and analysis and Fourier transform infrared spectroscopy. On the other hand, with the view to check the drug delivery and surgical tools usage of MgAl-CO3, antibacterial tests, performed according to the Kirby–Bauer method, revealed the inability the growth of the pathogenic bacterial strains. Thermogravimetry and differential thermal analysis revealed that evolution of water from the material occurs in two stages upon heating and a noticeable interaction takes place between water (in the vapor phase) and MgAl-CO3. Kinetic analysis of both steps provides almost constant values of activation energy, with the following average values in the range 0.1 < a < 0.9: E1 = (66 ± 9) kJ mol‒1; E2 = (106 ± 7) kJ mol‒1. Finally, prediction of reasonable reaction times extrapolated at 25 and 37 °C has been made from kinetic parameters of the first step, while almost unrealistic reaction time values were determined using the same procedure with kinetic parameters related to the second step.

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Layered double hydroxides are still out in the bloom: Syntheses, applications and advantages of three-dimensional flower-like structures

Cited by 49 publications

References 94 publications

ZnAl-SO4 Layered Double Hydroxide and Allophane for Cr(VI), Cu(II) and Fe(III) Adsorption in Wastewater: Structure Comparison and Synergistic Effects

ZnAl-SO4 Layered Double Hydroxide and Allophane for Cr(VI), Cu(II) and Fe(III) Adsorption in Wastewater: Structure Comparison and Synergistic Effects

Facile Synthesis of Hollow Flower-Like SnO and Applications in Lithium Ion Batteries

Thermal behavior and antibacterial studies of a carbonate Mg–Al-based layered double hydroxide (LDH) for in vivo uses

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