scholarly journals The Intercalation Behaviour and Physico-Chemical Characterisation of Novel Intercalated Nanocomposite from Zinc/Aluminium Layered Double Hydroxides and Broadleaf Herbicide Clopyralid

2020 ◽  
Vol 14 (1) ◽  
pp. 38-46 ◽  
Author(s):  
Sharifah Norain Mohd Sharif ◽  
◽  
Norhayati Hashim ◽  
Illyas Md Isa ◽  
Mazidah Mamat ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
Physico Chemical ◽  
Double Hydroxides ◽  
Intercalated Nanocomposite

scholarly journals New acetate-intercalated CoNiFe, ZnNiFe and CoZnFe layered double hydroxides: Synthesis by hydrolysis in polyol medium and characterization

2014 ◽  
Vol 10 (9) ◽  
pp. 3097-3106 ◽  
Author(s):  
Nawal A. Drici Setti ◽  
Zoubir Derriche ◽  
Noureddine JOUINI
Keyword(s):  
Layered Double Hydroxides ◽  
Uv Spectroscopy ◽  
Chemical Properties ◽  
Interlayer Spacing ◽  
Molar Ratio ◽  
Transmission Electron ◽  
Physico Chemical ◽  
Interlayer Region ◽  
Polyol Medium ◽  
Double Hydroxides

New layered double hydroxides (LDHs) CoNiFe, ZnNiFe and CoZnFe with MII/MIII molar ratio of 3, with acetate ions in the interlayer region have been prepared by forced  hydrolysis in polyol medium.The physico-chemical properties of all products were characterized by the methods of powder X-ray Diffraction, Infrared Spectroscopy, UV-Spectroscopy, Elemental analysis, Thermal analysis, Transmission Electron Microscopy and Scanning Electron Microscopy.It was found that all compounds present the typical features of hydrotalcite-like structure and exhibit a turbostratic character.The insertion of acetate anions into LDHs was confirmed and the interlayer spacing values were respectively 12.47, 13.64 and 14.69 Å for CoNiFe, ZnNiFe and CoZnFe.We notice that there is a difference between the interlayer spacing for all synthesized phases with and without zinc. This can be explained by a structural modification on the level of the layers and/ or different arrangement from the inserted species (anions + water) in the interlayer space for zinc materials.57Fe Mössbauer spectrometry allows concluding the presence of Fe3+ cations which occupy octahedral sites and confirming the absence of Fe2+ in the as-prepared compounds.

scholarly journals Zn2Al layered double hydroxides intercalated and adsorbed with anionic blue dyes: A physico-chemical characterization

2009 ◽  
Vol 333 (1) ◽  
pp. 120-127 ◽  
Author(s):  
Rafael Marangoni ◽  
Mustapha Bouhent ◽  
Christine Taviot-Guého ◽  
Fernando Wypych ◽  
Fabrice Leroux
Keyword(s):  
Layered Double Hydroxides ◽  
Chemical Characterization ◽  
Physico Chemical ◽  
Double Hydroxides

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.

Acceptorless amine dehydrogenation and transamination using Pd-doped layered double hydroxides

2018 ◽  
Author(s):  
Diana Ainembabazi ◽  
Nan An ◽  
Jinesh Manayil ◽  
Kare Wilson ◽  
Adam Lee ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
Oxidation States ◽  
Secondary Amines ◽  
Primary Amines ◽  
Acid Dissolution ◽  
Oxidative Amination ◽  
Strong Function ◽  
Excellent Activity ◽  
High Yields ◽  
Double Hydroxides

<div> <p>The synthesis, characterization, and activity of Pd-doped layered double hydroxides (Pd-LDHs) for for acceptorless amine dehydrogenation is reported. These multifunctional catalysts comprise Brønsted basic and Lewis acidic surface sites that stabilize Pd species in 0, 2+, and 4+ oxidation states. Pd speciation and corresponding cataytic performance is a strong function of metal loading. Excellent activity is observed for the oxidative transamination of primary amines and acceptorless dehydrogenation of secondary amines to secondary imines using a low Pd loading (0.5 mol%), without the need for oxidants. N-heterocycles, such as indoline, 1,2,3,4-tetrahydroquinoline, and piperidine, are dehydrogenated to the corresponding aromatics with high yields. The relative yields of secondary imines are proportional to the calculated free energy of reaction, while yields for oxidative amination correlate with the electrophilicity of primary imine intermediates. Reversible amine dehydrogenation and imine hydrogenation determine the relative imine:amine selectivity. Poisoning tests evidence that Pd-LDHs operate heterogeneously, with negligible metal leaching; catalysts can be regenerated by acid dissolution and re-precipitation.</p> </div> <br>

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