scholarly journals PREPARATION AND CHARACTERIZATION OF SODIUM LAURYL ETHER SULPHATE MODIFIED LAYERED DOUBLE HYDROXIDES

2015 ◽  
Vol 76 (3) ◽  
Author(s):  
Siti Hasnawati Jamal ◽  
Wan Md Zin Wan Yunus ◽  
Noor Azilah Mohd Kasim ◽  
Ong Keat Khim ◽  
Mansor Ahmad
Keyword(s):  
Layered Double Hydroxides ◽  
Exchange Process ◽  
X Ray Diffraction ◽  
Ion Exchange Process ◽  
Lauryl Ether ◽  
Before And After ◽  
Trivalent Cations ◽  
Co Precipitation ◽  
Double Hydroxides

Layered double hydroxides (LDHs) has attracted much attention of many industrialists as well as academicians as these materials can be used as catalysts, adsorbents, anion exchangers, stabilizers and fillers for polymers. The materials which consist of divalent and trivalent cations, and anions are nontoxic and easy to prepare. In addition, the exchangeability of their anions makes them easy to be modified to increase their hydrophobicity property through anion exchange process using long chain surfactant anions. In this study, sodium lauryl ether sulphate (SLES) modified LDHs was prepared by co precipitation of LDHs and followed SLES ions modification via ion exchange process.  Intercalations of the anions into the LDHs layers were confirmed by X-ray diffraction analysis.  The presence of functional groups before and after modification was studied by FTIR spectrometry. Thermalgravitmeric analysis also was carried out to determine the amount of surfactant intercalated into LDHs.

scholarly journals Modification of nano-sized layered double hydroxides by long-chain organic aliphatic surfactants

2008 ◽  
Vol 73 (3) ◽  
pp. 321-331 ◽  
Author(s):  
Ramasamy Anbarasan ◽  
Wanduc Lee ◽  
Seung Soon
Keyword(s):  
Thermal Stability ◽  
Layered Double Hydroxides ◽  
Exchange Process ◽  
Xrd Analysis ◽  
Basal Spacing ◽  
Ion Exchange Process ◽  
Dodecanedioic Acid ◽  
Double Hydroxides ◽  
Thermal Stability Of ◽  
Long Chain

The inter-layer anion of layered double hydroxides (LDH) with a hydrotalcite (HT)-like structure was ion-exchanged with various organic surfactants, particularly with long chain aliphatic surfactants. After the ion-exchange process, the basal spacing of the LDH was increased and the increase of the basal spacing depended on various factors, such as the intercalation capacity functionality and orientation capability of the surfactant. Of the employed surfactants, stearic acid intercalated LDH showed the highest increase of the basal spacing, which was confirmed by XRD analysis. FTIR results supported the interaction of the surfactants with the LDH. In addition, an increase in the thermal stability of the dodecanedioic acid intercalated HT was evidenced by the TGA method.

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

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.

scholarly journals Undoped and Eu3+ Doped Magnesium-Aluminium Layered Double Hydroxides: Peculiarities of Intercalation of Organic Anions and Investigation of Luminescence Properties

Materials ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 736 ◽  
Author(s):  
Aurelija Smalenskaite ◽  
Lina Pavasaryte ◽  
Thomas Yang ◽  
Aivaras Kareiva
Keyword(s):  
Layered Double Hydroxides ◽  
Organic Anion ◽  
Sol Gel ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Organic Guests ◽  
Double Hydroxides ◽  
Scanning Electron

The Mg3/Al and Mg3/Al0.99Eu0.01 layered double hydroxides (LDHs) were fabricated using a sol-gel chemistry approach and intercalated with different anions through ion exchange procedure. The influence of the origin of organic anion (oxalate, laurate, malonate, succinate, tartrate, benzoate, 1,3,5-benzentricarboxylate (BTC), 4-methylbenzoate (MB), 4-dimethylaminobenzoate (DMB) and 4-biphenylacetonate (BPhAc)) on the evolution of the chemical composition of the inorganic-organic LDHs system has been investigated. The obtained results indicated that the type and arrangement of organic guests between layers of the LDHs influence Eu3+ luminescence in the synthesized different hybrid inorganic–organic matrixes. For the characterization of synthesis products X-ray diffraction (XRD) analysis, infrared (FTIR) spectroscopy, fluorescence spectroscopy (FLS), and scanning electron microscopy (SEM), were used.

scholarly journals A study of the characterization of CdS/PMMA nanocomposite thin film

2019 ◽  
Vol 14 (29) ◽  
pp. 191-197
Author(s):  
Awras H. Ajil
Keyword(s):  
Energy Gap ◽  
Spray Pyrolysis Method ◽  
Chemical Spray Pyrolysis ◽  
X Ray Diffraction ◽  
Optical Energy Gap ◽  
Host Matrix ◽  
Chemical Spray ◽  
Before And After ◽  
Co Precipitation

Nanocomposites of polymer material based on CdS as fillermaterial and poly methyl methacrylate (PMMA) as host matrix havebeen fabricated by chemical spray pyrolysis method on glasssubstrate. CdS particles synthesized by co-precipitation route usingcadimium chloride and thioacetamide as starting materials andammonium hydroxide as precipitating agent. The structure isexamined by X-ray diffraction (XRD), the resultant film hasamorphous structure. The optical energy gap is found to be (4.5,4.06) eV before and after CdS addition, respectively. Electricalactivation energy for CdS/PMMA has two regions with values of0.079 and 0.433 eV.

Synthesis, characterization and catalytic behavior of iron porphyrins immobilized in layered double hydroxides

2002 ◽  
Vol 06 (08) ◽  
pp. 502-513 ◽  
Author(s):  
Matilte Halma ◽  
Fernando Wypych ◽  
Sueli M. Drechsel ◽  
Shirley Nakagaki
Keyword(s):  
Layered Double Hydroxides ◽  
Oxidation Reaction ◽  
X Ray Diffraction ◽  
Catalytic Behavior ◽  
X Ray ◽  
Uv Visible ◽  
Immobilized Compounds ◽  
Co Precipitation ◽  
Double Hydroxides ◽  
Homogeneous Media

We report the synthesis, characterization and catalytic behavior of iron(III) porphyrins immobilized in layered double hydroxides (LDH). A combination of EPR, UV-visible spectroscopy and powder X-ray diffraction (PXRD) was used to characterize the products. Three different procedures were used to perform the immobilization of iron porphyrin: a) adsorption into the LDH powder, b) co-precipitation and c) rehydration of calcined LDH. Several different porphyrins ( Fe ( TSPP ), Fe ( TCPP ), Fe ( TPP ) and Fe ( TDFSPP )) were employed in the study. After characterization, the isolated powders were investigated in the oxidation reaction of cyclohexane by iodosylbenzene and hydrogen peroxide in heterogeneous catalysis in comparison to homogeneous media. Some of these immobilized compounds were very good catalysts for this oxidation reaction, stimulating the future investigation of other substrates.

Synthesis and Characterization of Layered Double Hydroxides/Nafion Composites for Fuel Cell Application

2006 ◽  
Vol 977 ◽  
Author(s):  
Dharmaraj Raghavan ◽  
Bolnale Abayomi ◽  
Miriam Harewood ◽  
Sheriff Abudu ◽  
Elizabeth Williams ◽  
...  
Keyword(s):  
Thermal Characteristics ◽  
Composite Membranes ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Force Microscopy ◽  
Atomic Force ◽  
Fuel Cell Application ◽  
Co Precipitation ◽  
Double Hydroxides

AbstractIn this study, magnesium-aluminum (Mg-Al) based LDHs with different Mg2+/Al3+ ratios were prepared by co-precipitation method and modified with perfluorooctane-sulfonic acid tetraethylammonium salt (PFOSA). X-Ray Diffraction (XRD), Atomic Force Microscopy (AFM), Fourier Transfer Infrared spectroscopy (FTIR) and Thermogravimetric Analysis (TGA) were carried out to obtain the structural and thermal characteristics of resulting materials. The organo-modified LDHs have been used in the formulation of Nafion® nanocomposites. Nanocomposite membranes were prepared by casting of LDH/PFOSA nanoparticles dispersed in Nafion® solution. Then, modified LDH/Nafion composite membranes were evaluated for water retention capability at ambient and elevated temperature.

Preparation and Characterization of New Hybrid Materials Type Layered Double Hydroxides Intercalated with 4,6-dinitro-o-cresols

2008 ◽  
Vol 59 (2) ◽  
pp. 165-167
Author(s):  
Mihaela Frunza ◽  
Gabriela Lisa ◽  
Marcel Ionel Popa
Keyword(s):  
Layered Double Hydroxides ◽  
Chemical Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Physico Chemical ◽  
Double Hydroxides ◽  
Synthesized Materials ◽  
Analysis Point

The paper presents the tailoring synthesis and physico-chemical characterization of layered double hydroxides (LDH) intercalated with 4,6-dinitro-o-cresol (DNOC) by coprecipitation method. The X-ray diffraction (DRX), Fourier transformed infrared spectroscopy (FTIR) and thermogravimetric (TG -DTG) analysis point out the presence of the organic compound in the network structure of the synthesized materials. Considering together the pesticide activity of 4,6-dinitro-o-cresol and the biocompatibility of the layered double hydroxides the new synthesized materials could open interesting perspectives for obtaining more environmentally friendly insecticides.

Characterization of Chromate-Intercalated Layered Double Hydroxides

2006 ◽  
Vol 514-516 ◽  
pp. 1541-1545 ◽  
Author(s):  
Margarita del Arco ◽  
Daniel Carriazo ◽  
Cristina Martín ◽  
Amalia M. Pérez Grueso ◽  
Vicente Rives
Keyword(s):  
Layered Double Hydroxides ◽  
Thermal Analyses ◽  
Basal Spacing ◽  
X Ray Diffraction ◽  
N2 Adsorption ◽  
Exchange Method ◽  
X Ray ◽  
Ft Ir ◽  
Double Hydroxides

PXRD (powder x-ray diffraction), FT-IR (Fourier Transform infrared), N2 adsorption at - 196 °C and TG/DTA (thermogravimetric and differential thermal analyses) techniques have been used for characterisation of MgAl- and ZnAl-CrO4 LDHs, which had been prepared by the ion exchange method from the corresponding chloride LDH (layered double hydroxides) precursors. The results indicates that the oxometalate intercalation in both systems produces interlayer microporosity and a basal spacing of 8.7 Å; This gallery height decreases when the samples are calcined in the temperature range 100-300 °C, due to a grafting process. A larger thermal stability is detected for MgAl-CrO4 sample than for the zinc-containing one.

scholarly journals Synthesis of Mg-Fe layered double hydroxides and its application as catalyst for Friedel-Crafts benzoylation

2016 ◽  
Vol 19 (4) ◽  
pp. 185-193
Author(s):  
Phuong Thi Minh Nguyen ◽  
Phuong Hoang Tran ◽  
Chinh Quoc Nguyen
Keyword(s):  
Metal Oxides ◽  
Layered Double Hydroxides ◽  
Coprecipitation Method ◽  
Mixed Metal Oxides ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mixed Metal ◽  
Before And After ◽  
Double Hydroxides

Mg-Fe layered double hydroxides were synthesized by the coprecipitation method with different of Mg/Fe ratio (2/1, 3/1 and 4/1) and then were thermally transformed into mixed metal oxides. The obtained materials before and after the calcination at 450 oC were characterized by X-ray diffraction (XRD), SEM, BET, TGA, ICP. The samples were used as a catalyst for Friedel-Crafts benzoylation reactions. The catalyst can be easily separated and recycled compared to the traditional one.

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