On the synthesis of layered double hydroxides (LDHs) by reconstruction method based on the “memory effect”

doi:10.1016/j.micromeso.2015.03.024

Microporous and Mesoporous Materials

Volume 214, 15 September 2015, Pages 246-248

https://doi.org/10.1016/j.micromeso.2015.03.024 Get rights and content

Abstract

This letter summarizes the literature data on the synthesis of layered double hydroxides (LDHs) in order to demonstrate that the preparation by reconstruction method is not based on the memory effect but it is simply a direct synthesis of these attractive solids.

Section snippets

Letter

Layered double hydroxides (LDHs) are anionic clays, also known as hydrotalcites compounds. They are represented by the general formula ${[M_{1 - x}^{I I} M_{x}^{I I I} {(O H)}_{2}]}^{x +} {(A^{- n})}_{x / n} \cdot m H_{2} O$ were x falls in the range 0.25 ≤ x ≤ 0.33 for pure phases. The structure consists of brucite-like layers with a x positive charge due to the substitution of trivalent metal cations M^III for bivalent metal cations M^II. These layers are balanced by an equivalent inter-layered negative charge (A^–n)_x/n where n is the negative charge

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Recently, various related derivatives of layered double hydroxide (LDH) have attracted and received great interests in multidiscipline applications including environmental control via remediation and removing miscellaneous organic and inorganic contaminates from aqueous solutions and wastewater systems. The ability to synthesize LDHs by different processes and also to incorporate a variety of cations in the layers as well as the diverse interlayer anions have enhanced and motivated research works in this field. Therefore, designing and fabricating a large number of functional LDH derivatives with targeted and tunable properties for specific and selective surface applications have also increased in recent years. Therefore, this review article is dedicated to address an overview of the recently achieved efforts and progress in decontamination of dyes and pharmaceuticals as two important classes of organic pollutants with major concerns from aqueous solutions and wastewater systems. In addition, water treatment from some miscellaneous nonmetallic pollutants by LDH derivatives are also explored and surveyed. Additionally, the various dyes and pharmaceuticals pollutants, remediation techniques for removing the target pollutants were also outlined and discussed in this review. The different synthetic strategies for preparation of LDHs and their derivatives have been reviewed with strong emphasis on their structures. The surveyed dyes in this review included anionic, neutral and cationic ones, while the evaluated pharmaceuticals are mainly focused on antibiotics and non-steroidal anti-inflammatory drugs. Other related contaminants were also covered in this review. Finally, the future developments and potential applications of LDH derivatives have been outlined and pointed out.
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This review presents a comprehensive review of recent advances in layered double hydroxide (LDHs) materials, with a focus on their synthesis, modification, and applications in wastewater treatment. We examine the structure and properties of LDHs materials, including aspects such as tunability, structural memory effect, thermal stability, acidity and alkalinity, stripability and assemblability. Various synthesis methods for LDHs materials are described, encompassing coprecipitation, urea hydrolysis, hydrothermal, sol-gel, and template. Additionally, we delve into diverse modification techniques, such as cation doping, anion exchange, reconstitution, delamination, and composite. Lastly, we discuss the potential applications of LDHs materials in wastewater treatment, specifically in the areas of adsorption and catalysis, with particular emphasis on the removal of heavy metal ions and dyes. In summary, This review provides a comprehensive overview of recent advances in LDHs materials and their potential for wastewater treatment.
Host–guest interactions in biocompatible anion-intercalated Mg-Al layered double hydroxides and their influence on L-lactate uptake
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Trimetallic layered double hydroxide solid solutions with the compositions Zn/Co-Al, Zn/Cu-Al and Co/Cu-Al (2 M<sup>2+</sup>:1M<sup>3+</sup>), intercalated with hydrated sulfate and sodium cations
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Trimetallic layered double hydroxides (LDHs) solid solutions with the compositions Zn/Co-Al, Zn/Cu-Al, and Co/Cu-Al, intercalated with hydrated SO₄^2-/Na⁺ were synthesized by co-precipitation with increasing pH at room temperature, hydrothermally treated at 90 °C for 120 h and dried at 40 °C. The compounds were analyzed by XRD, where all the systems presented basal distances close to 11 Å, typical of the intercalation of sulfate in double-layer arrangements in the presence of hydrated sodium cations. FTIR indicated the presence of typical bands attributed to sulfate, water molecules and metal–oxygen lattice vibrations. SEM and TEM images of the Zn/Co-Al system indicated the presence of micrometric particles, homogeneous aspect and nanometric dimensions along the layer packing (basal directions), in the whole range of replacements. EDS spectra of all samples indicated the presence of the expected elements in all compounds. ICP-OES indicated that all system contained the elements close to the expected concentration, with slightly smaller contents of sulfate and sodium cations. SAED spectra of the Zn/Co-Al system indicated the presence of a√3 × a√3 superstructures in all samples, attributed to the ordering of divalent metals in the layer domains, typical of compounds with 2 M²⁺:1M³⁺ molar ratios. Homogeneous solid solutions were obtained for all systems, but a small contamination with carbonate was observed in some samples, producing compounds with the ideal formula [M²⁺_0.666Al_0.333(OH)₂][(SO₄)_0.222-x(CO₃)_xNa_0.111] nH₂O. This work increases the number of members of trimetallic LDH and opens a new avenue for future applications.
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To study the effects of MgAl-LDHs/TiO₂ on the properties of cement paste and recycled aggregates, MgAl-LDO (MgAl-LDHs calcined products) and TiO₂ were mixed during the reconstruction of MgAl-LDHs laminates based on the memory effects of layered double hydroxides (LDHs), and then MgAl-LDHs/TiO₂ was synthesized. The performance changes were characterized with hydration heat tests, the microscopic morphologies of the hydration products, and the physical and mechanical properties of the cement paste. The effect of the MgAl-LDHs/TiO₂ on the multi-interfacial transition zone (ITZ, the interface between the old paste and new paste) of the recycled aggregates was characterised with the micromorphology, meso-mechanical properties, and element diffusion behaviour. The photocatalytic activity of MgAl-LDHs/TiO₂ loaded on recycled aggregate was evaluated with the degradation of methylene blue under sunlight. The results showed that the addition of MgAl-LDHs/TiO₂ promoted the initial hydration of ordinary Portland cement (OPC) and induced and promoted the growth and formation of crystalline cement hydration products. The initial setting time and final setting time were shortened, and the compressive strength of the hardened paste was improved when MgAl-LDHs/TiO₂ was added to the cement paste. The MgAl-LDHs/TiO₂ compacted the recycled aggregates and improved the structural properties of the ITZ. The MgAl-LDHs/TiO₂ altered diffusion within the ITZ. The total efficiency for the degradation of methylene blue by the 5–10 mm MgAl-LDHs/TiO₂ loaded on recycled aggregate reached 82.2% after 80 min under simulated sunlight.

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CorrespondenceOn the synthesis of layered double hydroxides (LDHs) by reconstruction method based on the “memory effect”

Abstract

Section snippets

Letter

Catal. Today

Microp. Mesop. Mater.

J. Control. Release

Appl. Clay Sci.

Mater. Lett.

Microp. Mesop. Mater.

J. Solid State Chem.

Appl. Clay Sci.

Cem. Concr. Res.

Micropor. Mesopor. Mater.

Appl. Clay Sci.

J. Solid State Chem.

Appl. Catal. A General

Chem. Eng. J.

Prog. Org. Coat

Appl. Catal. B Environ.

J. Environ. Sci.

J. Hazard. Mater.

Catal. Commun.

Appl. Catal. A General

Appl. Clay Sci.

Appl. Clay Sci.

Chimia

Correspondence
On the synthesis of layered double hydroxides (LDHs) by reconstruction method based on the “memory effect”