SYNTHESIS OF ACECLOFENAC/HYDROXYPROPYL-β-CYCLODEXTRIN INTERCALATED LAYERED DOUBLE HYDROXIDES AND CONTROLLED RELEASE PROPERTIES

Aceclofenac (AC)/hydroxypropyl-β-cyclodextrin (HP-β-CD) complex intercalated layered double hydroxides (LDHs) have been synthesized by reconstruction method. X-ray diffraction, Fourier transform infrared and thermal gravimetric analyses indicated a successful intercalation of AC/HP-β-CD complex into the LDHs gallery. The AC release properties were also studied in different pH values buffer solution. The results indicate that the AC/HP-β-CD intercalated LDH has a potential application in drug delivery agent.

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Synthesis of Carboxylic Acids Intercalated Mg-Al Layered Double Hydroxides by a Modified Reconstruction Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.66.218 ◽

2009 ◽

Vol 66 ◽

pp. 218-221 ◽

Cited By ~ 1

Author(s):

Wei Dong Yang ◽

Sheng Li ◽

Dong Yang Wu ◽

Mark Spicer ◽

Voytek Gutowski ◽

...

Keyword(s):

Layered Double Hydroxides ◽

Octanoic Acid ◽

Unsaturated Fatty Acids ◽

Reconstruction Method ◽

Gravimetric Analysis ◽

X Ray Diffraction ◽

X Ray ◽

Double Hydroxides ◽

Hexagonal Platelet ◽

Platelet Structure

A series of saturated and unsaturated fatty acids (i.e. sorbic acid, octanoic acid, lauric acid, stearic acid and oleic acid) were successfully intercalated into Mg-Al layered double hydroxides (LDHs) using a modified reconstruction method, as confirmed by X-ray diffraction (XRD), Fourier transformed infrared (FTIR) and thermal gravimetric analysis (TGA). The fatty acid intercalated LDHs thus prepared exhibit much better well-defined hexagonal platelet structure than samples prepared by the conventional reconstruction method.

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Photocatalytic Degradation of 2,4,6-Trichlorophenol by MgO–MgFe2O4 Derived from Layered Double Hydroxide Structures

Catalysts ◽

10.3390/catal9050454 ◽

2019 ◽

Vol 9 (5) ◽

pp. 454 ◽

Cited By ~ 5

Author(s):

Esthela Ramos-Ramírez ◽

Francisco Tzompantzi-Morales ◽

Norma Gutiérrez-Ortega ◽

Héctor G. Mojica-Calvillo ◽

Julio Castillo-Rodríguez

Keyword(s):

Photocatalytic Degradation ◽

Layered Double Hydroxides ◽

X Ray Diffraction ◽

Application Study ◽

Toxic Compounds ◽

X Ray ◽

Thermally Activated ◽

Double Hydroxide ◽

Double Hydroxides ◽

Scanning Electron

In recent years, the search for solutions for the treatment of water pollution by toxic compounds such as phenols and chlorophenols has been increasing. Phenols and their derivatives are widely used in the manufacture of pesticides, insecticides, paper, and wood preservers, among other things. Chlorophenols are partially biodegradable but not directly photodegradable by sunlight and are extremely toxic—especially 2,4,6-trichlorophenol, which is considered to be potentially carcinogenic. As a viable proposal to be applied in the treatment of water contaminated with 2,4,6-trichlorophenol, this paper presents an application study of the thermally activated Mg/Fe layered double hydroxides as photocatalysts for the mineralization of this contaminant. Activated Mg/Fe layered double hydroxides were characterized by X-ray diffraction, thermal analysis, N2 physisorption, and scanning electron microscopy with X-ray dispersive energy. The results of the photocatalytic degradation of 2,4,6-trichlorophenol in aqueous solution showed good photocatalytic activity, with an efficiency of degradation of up to 93% and mineralization of 82%; degradation values which are higher than that of TiO2-P25, which only reached 18% degradation. The degradation capacity is attributed to the structure of the MgO–MgFe2O4 oxides derived from double laminate hydroxide Mg/Fe. A path of degradation based on a mechanism of superoxide and hollow radicals is proposed.

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High efficient photocatalytic activity of Zn-Al-Ti layered double hydroxides nanocomposite

MATEC Web of Conferences ◽

10.1051/matecconf/201814901087 ◽

2018 ◽

Vol 149 ◽

pp. 01087 ◽

Cited By ~ 1

Author(s):

F. Amor ◽

A. Diouri ◽

I. Ellouzi ◽

F. Ouanji ◽

M. Kacimi

Keyword(s):

Methylene Blue ◽

Photocatalytic Activity ◽

Uv Irradiation ◽

Layered Double Hydroxides ◽

Removal Rate ◽

X Ray Diffraction ◽

Simple Method ◽

X Ray ◽

High Efficient ◽

Double Hydroxides

This work establishes a simple method for synthesising layered double hydroxides (LDHs) powders with coprecipitation. The characteristics of the samples were investigated y X-ray diffraction (XRD), scanning electron microscopy (SEM) and spectrophotometer UV–Vis (DRS). Non-uniform distribution was shown for LDHs samples by SEM. Photocatalytic efficiencies were tested using methylene blue (MB) dye as a model contaminant under UV irradiation. In particular, Zn–Al-Ti LDH exhibited an excellent performance towards MB degradation compared with commercial TiO2 nanoparticles. Methylene blue removal percentage was reached at almost 100%, whereas commercial TiO2 reached a removal rate of only 66% under the same conditions within 20 min. The aim of the current work is to prepare Zn-Al-Ti layered double hydroxides nanocomposite and to evaluate their photocatalytic activity in the removal of methylene blue under UV irradiation.

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Designing Magnetic Layered Double Hydroxides and Two-Dimensional Magnetic Nano-Nets of Cobalt Ferrite through a Novel Approach

Applied Sciences ◽

10.3390/app8112099 ◽

2018 ◽

Vol 8 (11) ◽

pp. 2099 ◽

Cited By ~ 4

Author(s):

Osama Saber ◽

Abdullah Aljaafari ◽

Sarah Asiri ◽

Khalid Batoo

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Layered Double Hydroxides ◽

Cobalt Ferrite ◽

High Coercivity ◽

Two Dimensional ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron ◽

Double Hydroxides

The present study has a dual aim of supporting magnetic nanoparticles over the nanolayers of LDHs and designing two-dimensional magnetic nano-nets of cobalt ferrite. In this trend, nanoparticles of CoFe2O4 were prepared and supported by Co-Fe LDH through urea hydrolysis. The nanolayered structures of Co-Fe LDH were confirmed by X-ray diffraction, energy-dispersive X-ray spectrometry, FT-IR spectra, thermal analyses, and transmission electron microscopy. In addition, they indicated that 13.2% CoFe2O4 were supported over Co-Fe LDH. Transformation of the nanolayered structures of Co-Fe LDH to nano-nets was achieved by the catalytic effect of the supported CoFe2O4 nanoparticles through solvent thermal technique. X-ray diffraction patterns and transmission electron microscopy images confirmed the transformation of the supported Co-Fe LDH to nano-nets of cobalt ferrite. In order to indicate the effect of the LDH for designing the nano-nets, nanoparticles of cobalt ferrite were prepared by the same technique without LDH. The magnetic behavior of the nano-nets and the supported Co-Fe LDH were measured and compared with the nanoparticles through vibrating sample magnetometer technique. The magnetic parameters indicated that the prepared nano-nets have ferromagnetic behavior and high coercivity. However, the prepared nanoparticles revealed a superparamagnetic state and low coercivity. The experimental results concluded that the incorporation of nanoparticles with nanowires into nano-net structures has been found to be an efficient way to improve their magnetic properties and prevent their agglomerations. Finally, layered double hydroxides are an important source for constructing magnetic nanolayered structures and nano-nets.

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Preparation of Tween 80-Zn/Al-Levodopa-Layered Double Hydroxides Nanocomposite for Drug Delivery System

The Scientific World JOURNAL ◽

10.1155/2014/104246 ◽

2014 ◽

Vol 2014 ◽

pp. 1-10 ◽

Cited By ~ 13

Author(s):

Aminu Umar Kura ◽

Samer Hasan Hussein-Al-Ali ◽

Mohd Zobir Hussein ◽

Sharida Fakurazi

Keyword(s):

Drug Delivery ◽

Tween 80 ◽

Shielding Effect ◽

Coating Process ◽

X Ray Diffraction ◽

X Ray ◽

Aggregation Structure ◽

Viability Study ◽

Double Hydroxides ◽

Mitochondrial Dehydrogenase Activity

We incorporated anti-Parkinsonian drug, levodopa (dopa), in Zn/Al-LDH by coprecipitation method to form dopa-LDH nanocomposite. Further coating of Tween-80 on the external surfaces of dopa-LDH nanocomposite was achieved through the oxygen of C=O group of Tween-80 with the layer of dopa-LDH nanocomposite. The final product is called Tween-dopa-LDH nanocomposite. The X-ray diffraction indicates that the Tween-dopa-LDH nanocomposite was formed by aggregation structure. From the TGA data, the Tween-80 loading on the surface of LDH and dopa-LDH was 8.6 and 7.4%, respectively. The effect of coating process on the dopa release from Tween-dopa-LDH nanocomposite was also studied. The release from Tween-dopa-LDH nanocomposite shows slower release compared to the release of the drug from dopa-LDH nanocomposite as done previously in our study, presumably due to the retarding shielding effect. The cell viability study using PC12 showed improved viability with Tween-80 coating on dopa-LDH nanocomposite as studied by mitochondrial dehydrogenase activity (MTT assay).

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Probing the thermal decomposition process of layered double hydroxides through in situ 57Fe Mössbauer and in situ X-ray diffraction experiments

Journal of Materials Science ◽

10.1007/s10853-006-1143-z ◽

2006 ◽

Vol 42 (2) ◽

pp. 534-538 ◽

Cited By ~ 6

Author(s):

Daniel X. Gouveia ◽

Odair P. Ferreira ◽

Antonio G. Souza Filho ◽

M. G. da Silva ◽

J. A. C. de Paiva ◽

...

Keyword(s):

Thermal Decomposition ◽

Layered Double Hydroxides ◽

Decomposition Process ◽

X Ray Diffraction ◽

Thermal Decomposition Process ◽

X Ray ◽

57Fe Mössbauer ◽

Double Hydroxides

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Interlayer Structure of Bioactive Molecule, 2-Aminoethanesulfonate, Intercalated into Calcium-Containing Layered Double Hydroxides

Journal of Nanomaterials ◽

10.1155/2012/987938 ◽

2012 ◽

Vol 2012 ◽

pp. 1-7 ◽

Cited By ~ 5

Author(s):

Tae-Hyun Kim ◽

Hyoung Jun Kim ◽

Jae-Min Oh

Keyword(s):

Layered Double Hydroxides ◽

Solid Phase ◽

X Ray Diffraction ◽

X Ray ◽

Calcium Cation ◽

Particle Size And Morphology ◽

Interlayer Structure ◽

Diffraction Patterns ◽

Size And Morphology ◽

Double Hydroxides

We have successfully intercalated 2-aminoethanesulfonate, a well-known biomolecule taurine, into calcium-containing layered double hydroxides via optimized solid phase intercalation. According to X-ray diffraction patterns and infrared spectroscopy, it was revealed that the intercalated taurine molecules were each directly coordinated to other calcium cation and arranged in a zig-zag pattern. Scanning electron microscopy showed that the particle size and morphology of the LDHs were not affected by the solid phase intercalation, and the surface of intercalates was covered by organic moieties. From ninhydrin amine detection tests, we confirmed that most of the taurine molecules were well stabilized between the calcium-containing LDH layers.

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Photocatalytic decolourization of methylene blue using [Zn-Al] layered double hydroxides synthesized at different molar cationic ratios

Clay Minerals ◽

10.1180/claymin.2017.052.2.03 ◽

2017 ◽

Vol 52 (2) ◽

pp. 203-215 ◽

Cited By ~ 2

Author(s):

Kaouther Abderrazek ◽

Najoua Frini Srasra ◽

Ezzeddine Srasra

Keyword(s):

Methylene Blue ◽

Photocatalytic Activity ◽

Layered Double Hydroxides ◽

Diffuse Reflectance Spectroscopy ◽

X Ray Diffraction ◽

X Ray ◽

Inductively Coupled ◽

Molar Ratios ◽

Constant Ph ◽

Double Hydroxides

Abstract[Zn-Al] layered double hydroxides (LDH) with cationic molar ratios of R = Zn/Al 1–5 were synthesized by the coprecipitation method at constant pH = 10. The samples synthesized and their derived forms obtained after calcination at 500°C and at 900°C (denoted Zn-Al-R, Zn-Al-R-500 and Zn-Al-R-900, respectively), were characterized by X-ray diffraction (XRD), inductively coupled plasmamass spectrometry, scanning electron microscopy, energy-dispersive X-ray spectroscopy, diffuse reflectance spectroscopy and nitrogen physisorption at −196°C. The XRD study showed: (1) the presence of accessory ZnO with the LDH in samples synthesized with R ≥ 3; and (2) the lamellar structure was destroyed at 500°C which made room for a poorly ordered ZnO phase, while calcination at 900°C yielded well crystallized ZnO and ZnAl2O4. The photocatalytic activity of the calcined and the unheated samples was evaluated for the decolourization of methylene blue. The photocatalytic activity was dependent on the cationic ratio R and on the calcination temperature. The sample Zn-Al-3 displayed maximum photocatalytic activity. Calcination at 500 and 900°C improved the photocatalytic activity of LDH synthesized at R = 1 and 2.

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Kinetic Adsorption of Direct Yellow Onto Zn/Al and Zn/Fe Layered Double Hydroxides

Science & Technology Indonesia ◽

10.26554/sti.2019.4.4.101-104 ◽

2019 ◽

Vol 4 (4) ◽

pp. 101

Author(s):

Neza Rahayu Palapa ◽

Bakri Rio Rahayu ◽

Tarmizi Taher ◽

Aldes Lesbani ◽

Risfidian Mohadi

Keyword(s):

Layered Double Hydroxides ◽

Kinetic Studies ◽

X Ray Diffraction ◽

X Ray ◽

First Order ◽

Bet Method ◽

Pseudo Second Order ◽

Time Variations ◽

Co Precipitation ◽

Double Hydroxides

Zn/Al and Zn/Fe layered double hydroxides has successfully synthesized by co-precipitation methods with molar ration 3:1. The samples were characterized using X-Ray Diffraction, Fourier Transform Infrared Spectroscopy and Surface Area using BET method. In this study, Zn/Al and Zn/Fe layered double hydroxides were used to remove direct yellow dye in aqueous solution. The experiments were carried out time variations with the aim of observing the kinetic studies. The results showed that the adsorption of direct yellow onto Zn/Al and Zn/Fe layered double hydroxides based on co-efficient correlation kinetic models more fit using pseudo-second-order than pseudo-first-order.

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