Studies of the effects of synthetic procedure on base catalysis using hydroxide-intercalated layer double hydroxides

2006 ◽  
Vol 114 (4) ◽  
pp. 397-402 ◽  
Author(s):  
H. Christopher Greenwell ◽  
Peter J. Holliman ◽  
William Jones ◽  
Beatriz Vaca Velasco
Keyword(s):  
Base Catalysis ◽  
Synthetic Procedure ◽  
Layer Double Hydroxides ◽  
Double Hydroxides

Mechanically Strong, Thermally Healable, and Recyclable Epoxy Vitrimers Enabled by ZnAl-Layer Double Hydroxides

2021 ◽  
Vol 9 (6) ◽  
pp. 2580-2590
Author(s):  
Gaoming Li ◽  
Ping Zhang ◽  
Siqi Huo ◽  
Yingke Fu ◽  
Lin Chen ◽  
...  
Keyword(s):  
Layer Double Hydroxides ◽  
Double Hydroxides

Electrochemical Synthesis of Layer Double Hydroxides, Its Characterization, and Performance Study for Removal of Nitrate and Arsenic

2012 ◽  
pp. 413-420
Author(s):  
Md. Iftikher Haider ◽  
Jewel Andrew Gomes ◽  
Kevin Urbanczyk ◽  
David L. Cocke ◽  
Hylton McWhinney ◽  
...  
Keyword(s):  
Electrochemical Synthesis ◽  
Performance Study ◽  
And Performance ◽  
Layer Double Hydroxides ◽  
Double Hydroxides

scholarly journals Multi-Fold Enhancement in Compressive Properties of Polystyrene Foam Using Pre-delaminated Stearate Functionalized Layer Double Hydroxides

Polymers ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 8
Author(s):  
Emmanuel O. Ogunsona ◽  
Koffi L. Dagnon ◽  
Nandika Anne D'Souza
Keyword(s):  
Surface Area ◽  
Supercritical Co2 ◽  
Hydrophobic Interactions ◽  
High Surface ◽  
High Surface Area ◽  
Bubble Nucleation ◽  
Environmentally Benign ◽  
Compressive Properties ◽  
Layer Double Hydroxides ◽  
Double Hydroxides

Developing an environmentally benign styrene foam is a critical environmental need. Supercritical CO2 use in foams has proven to be a valuable path. Adding fillers to increase bubble nucleation has been pursued concurrently. A prominent filler used is high surface area fillers, such as smectic clays. However, all studies to date show a limit of 152% in compressive moduli and 260% in the compressive stress. The values, even with such gains, limit structural application. A seminal work in 1987 by Suh and Cotton proved that carbonyl linkages in calcium carbonates and CO2 interact and impact nucleation efficiency and performance in supercritical CO2 foams. In this paper, a high surface area clay (layer double hydroxides) which begins in an exfoliated state, then functionalized with a long chain alkyl carboxylate (stearic acid) is synthesized. The result is a remarkable multi-fold improvement to the compressive properties in comparison to polystyrene (PS); a 268% and 512% increase in compressive modulus and strength, respectively. Using a pre-delaminated approach, the higher surface area was achieved in the clays. The presence of the stearate improved the interactions between the clay galleries and PS through hydrophobic-hydrophobic interactions. The glass transition temperature of the nanocomposites was observed to shift to higher values after foaming. The results point to a new path to increase performance using a pre-delaminated clay with functional groups for environmentally benign foams.

Random stacking of a commensurate guest layer in an ordered host: NiAl layer-double-hydroxides

1997 ◽  
Vol 101 (11) ◽  
pp. 835-839 ◽  
Author(s):  
D.R Hines ◽  
G.T Seidler ◽  
M.M.J Treacy ◽  
S.A Solin
Keyword(s):  
Layer Double Hydroxides ◽  
Double Hydroxides

scholarly journals Synthesis of nanocomposite coating based on TiO2/ZnAl layer double hydroxides

2017 ◽  
Vol 67 (325) ◽  
pp. 112 ◽  
Author(s):  
V. Jovanov ◽  
O. Rudic ◽  
J. Ranogajec ◽  
E. Fidanchevska
Keyword(s):  
Mechanical Activation ◽  
Catalyst Support ◽  
Xrd Analysis ◽  
Nanocomposite Coating ◽  
Precipitation Method ◽  
Cleaning Efficiency ◽  
Co Precipitation ◽  
Layer Double Hydroxides ◽  
Double Hydroxides ◽  
Water Rinsing

The aim of this investigation was the synthesis of nanocomposite coatings based on Zn-Al layered double hydroxides (Zn-Al LDH) and TiO2. The Zn-Al LDH material, which acted as the catalyst support of the active TiO2 component (in the content of 3 and 10 wt. %), was synthesized by a low super saturation co-precipitation method. The interaction between the Zn-Al LDH and the active TiO2 component was accomplished by using vacuum evaporation prior to the mechanical activation and only by mechanical activation. The final suspension based on Zn-Al LDH and 10wt. % TiO2, impregnated only by mechanical activation, showed the optimal characteristics from the aspect of particle size distribution and XRD analysis. These properties had a positive effect on the functional properties of the coatings (photocatalytic activity and self-cleaning efficiency) after the water rinsing procedure.

ZnAl-layer double hydroxides as photocatalysts for oxidation of phenol in aqueous solution

2005 ◽  
Vol 265 (1-3) ◽  
pp. 64-72 ◽  
Author(s):  
Ágnes Patzkó ◽  
Robert Kun ◽  
Viktória Hornok ◽  
Imre Dékány ◽  
Thomas Engelhardt ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Oxidation Of Phenol ◽  
Layer Double Hydroxides ◽  
Double Hydroxides

scholarly journals Nanohybrid Layered Double Hydroxides Used to Remove Several Dyes from Water

2019 ◽  
Vol 3 (2) ◽  
pp. 41 ◽  
Author(s):  
Karima Abdellaoui ◽  
Ivana Pavlovic ◽  
Cristobalina Barriga
Keyword(s):  
Layered Double Hydroxides ◽  
Wide Spectrum ◽  
Dodecylbenzene Sulfonate ◽  
Hydrophilic Nature ◽  
Interlayer Anion ◽  
Hydrophilic Character ◽  
Dyes Adsorption ◽  
Layer Double Hydroxides ◽  
Double Hydroxides

For the preparation and characterization of several layer double hydroxides (LDH) with inorganic interlayer anions (carbonate and nitrate) and nanohybrids, two organo-LDHs were studied in detail. The dodecylbenzene sulfonate (DBS) was used as an organic interlayer anion to modify the hydrophilic nature of the interlayer. The aim of the modification of the layered double hydroxides (LDH) was to change the hydrophilic character of the interlayer to hydrophobic with the purpose of improving its ability to adsorb several (anionic and cationic) dyes from water. These compounds have been used as adsorbents of amaranth (Am), diamine green B (DGB) and brilliant green (BG) dyes. Adsorption tests were conducted using variable pH values, contact times and initial dye concentrations (adsorption isotherms) to identify the optimum conditions for the intended purpose. Adsorbents and adsorption products were characterized by several physicochemical techniques. The results of the adsorption tests showed that the organo-LDH nanohybrids could be efficient adsorbents in the removal of studied dyes from water. Thus, it can be concluded that nanohybrids studied in this work might act as suitable supports in the design of adsorbents for the removal of a wide spectrum of dyes with the aim of reducing the adverse effects on water resources.

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