Synthesis of layered double hydroxides through continuous flow processes: A review

Tichit, Didier; Layrac, Géraldine; Gérardin, Corine

doi:10.1016/j.cej.2019.03.057

Cited by 84 publications

(45 citation statements)

References 182 publications

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“…Layered double hydroxides (LDH), also termed anionic clays belong to clay minerals (Forano et al, 2013 ) with a brucite like layered structure and a general formula

, where M 2+ and M 3+ are divalent and trivalent cations, and A n− interlayered anions. Although they are rarely observed in the natural state, this family of materials can be easily prepared in the laboratory by different methods such as coprecipitation using NaOH, urea hydrolysis, sol-gel, and epoxide methods (Tokudome et al, 2016 ; Prevot and Tokudome, 2017 ; Tichit et al, 2019 ). Based on fine control of the synthesis conditions, matrices with a tunable chemical composition are prepared by varying the nature of M 2+ and M 3+ , their ratio and the type of anion intercalated which can range from simple inorganic anions, polyoxometalates (Liu et al, 2020 ) and organic or even bioorganic anions bearing carboxylate, sulfonate, or phosphonate groups (Taviot-Guého et al, 2018 ).…”

Section: Introductionmentioning

confidence: 99%

Confined Growth of NiAl-Layered Double Hydroxide Nanoparticles Within Alginate Gel: Influence on Electrochemical Properties

2020

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NiAl Layered Double Hydroxide (LDH) alginate bionanocomposites were synthesized by confined coprecipitation within alginate beads. The NiAl based bionanocomposites were prepared either by impregnation by divalent and trivalent metal cations of pre-formed calcium cross-linked alginate beads or by using the metal cations (Ni2+, Al3+) as crosslinking cationic agents for the biopolymer network. The impregnation step was systematically followed by a soaking in NaOH solution to induce the LDH coprecipitation. Powder x-ray diffraction (PXRD), infrared spectroscopy (FTIR), energy dispersive X-ray analysis (EDX), thermogravimetry analysis (TGA), electron microscopies (SEM and TEM) confirmed the biotemplated coprecipitation of LDH nanoparticles ranging from 75 to 150 nm for both strategies. The drying of the LDH@alginate beads by supercritical CO2 drying process led to porous bionanocomposite aerogels when Ca2+ cross-linked alginate beads were used. Such confined preparation of NiAl LDH was extended to bionanocomposite films leading to similar results. The permeability and the electrochemical behavior of these NiAl@alginate bionanocomposites, as thin films coated on indium tin oxide (ITO) electrodes, were investigated by cyclic voltammetry, demonstrating an efficient diffusion of the K4Fe(CN)6 redox probe through the LDH@alginate based films and the improvement of the electrochemical accessibility of the Ni sites.

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“…Layered double hydroxides (LDH), also termed anionic clays belong to clay minerals (Forano et al, 2013 ) with a brucite like layered structure and a general formula

Section: Introductionmentioning

confidence: 99%

Confined Growth of NiAl-Layered Double Hydroxide Nanoparticles Within Alginate Gel: Influence on Electrochemical Properties

2020

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“…Layered double hydroxide was studied as sorbent because of their adsorption ability due to exchangeable anion in the interlayer, high surface area and accessible to synthesized [23][24][25] . Recently, layered double hydroxide was used as a sorbent of dyes such as Ca/Al after being modified through the solvothermal method.…”

Section: Introductionmentioning

confidence: 99%

Adsorption Study of Malachite Green Removal from Aqueous Solution Using Cu/M3+ (M3+=Al, Cr) Layered Double Hydroxide

Palapa¹,

Mohadi²,

Rachmat³

et al. 2020

Mediterr.J.Chem.,

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Layered double hydroxide (LDH) Cu/Al and Cu/Cr had been used as adsorbent of malachite green (MG) in aqueous solution. The properties of Cu/Al and Cu/Cr LDHs were analyzed by X-ray diffraction, surface area analysis (BET) and FTIR spectroscopy. Adsorption study of MG was achieved at pH 9. Adsorption of MG follows the pseudo-second-order kinetic model. Langmuir isotherm was suitable for adsorption of MG on both LDH with a maximum adsorption capacity of 59.52 mg/g. The thermodynamic study indicated that the adsorption process is physisorption, spontaneous, and endothermic process. Adsorption of MG onto LDHs involve the acid-base interaction between adsorbent and adsorbate.

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“…, where M 2+ and M 3+ are the fraction of bivalent (Mg 2+ , Cu 2+ , Zn 2+ , Mn 2+ ) and trivalent (Al 3+ , Fe 3+ , Ti 3+ , Cr 3+ ) cations, respectively, A n− represents the interlayer anions, and x represents the molar ratio of trivalent cations to total cation content [27][28][29][30][31]. LDHs have been extensively employed in adsorbents, photocatalysts, H 2 O splitting, and many other fields on account of their unique features such as simple preparation, chemical and physical stability, and adjustable composition [32][33][34][35][36]. The most inherent LDH property is exchangeable intercalation, which imparts high catalytic efficiency [37,38].…”

Section: Introductionmentioning

confidence: 99%

Advances in layered double hydroxide-based ternary nanocomposites for photocatalysis of contaminants in water

Sun

Heo

Park

et al. 2020

Nanotechnology Reviews

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Recently, photocatalysis technology has been widely considered as an effective method for solving environmental pollution issues and addressing the energy crisis. Hybrids of layered double hydroxide (LDH) exhibit excellent photocatalytic properties for use in the field of wastewater treatment due to the large interlayer spaces, chemical stability, and low cost. However, pristine LDH suffers from numerous limitations, such as insufficient visible light utilization and a high recombination rate of electron–hole pairs, resulting in degradation of photocatalytic performance. Recent advancements have demonstrated that LDH-based hybrids are suitable nanocomposites for photocatalytic applications when combining LDH with other semiconductors. This article summarizes the progress in the field of LDH-based ternary composites with emphasis on the removal of organic pollutants and heavy metal ions from aqueous media. Moreover, the applications and synthesis of LDH-based ternary composites, including corresponding examples, are discussed. In addition, the interaction mechanisms between photocatalysts and contaminants in water are comprehensively explained. Finally, the review provides insights into the challenges and prospects for the advancement of LDH-based photocatalysts.

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Synthesis of layered double hydroxides through continuous flow processes: A review

Cited by 84 publications

References 182 publications

Confined Growth of NiAl-Layered Double Hydroxide Nanoparticles Within Alginate Gel: Influence on Electrochemical Properties

Confined Growth of NiAl-Layered Double Hydroxide Nanoparticles Within Alginate Gel: Influence on Electrochemical Properties

Adsorption Study of Malachite Green Removal from Aqueous Solution Using Cu/M3+ (M3+=Al, Cr) Layered Double Hydroxide

Advances in layered double hydroxide-based ternary nanocomposites for photocatalysis of contaminants in water

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