Synthesis of various layered double hydroxides using aluminum dross generated in aluminum recycling process

2012 ◽  
Vol 110-111 ◽  
pp. 46-52 ◽  
Author(s):  
Norihiro Murayama ◽  
Ikuo Maekawa ◽  
Hiroyuki Ushiro ◽  
Takayuki Miyoshi ◽  
Junji Shibata ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
Recycling Process ◽  
Aluminum Dross ◽  
Aluminum Recycling ◽  
Double Hydroxides

scholarly journals Application of Aluminum Dross-Derived Layered Double Hydroxides to Removal of Organic Compounds in Aqueous Solution

2014 ◽  
Vol 61 (1) ◽  
pp. 32-38
Author(s):  
Norihiro MURAYAMA ◽  
Takayuki MIYOSHI ◽  
Takumi HAYASHI ◽  
Junji SHIBATA
Keyword(s):  
Aqueous Solution ◽  
Organic Compounds ◽  
Layered Double Hydroxides ◽  
Aluminum Dross ◽  
Double Hydroxides

Synthesis, characterization and sinterability of pure and Ni-doped nano layered double hydroxides from aluminum dross

2019 ◽  
Vol 45 (14) ◽  
pp. 17598-17610 ◽  
Author(s):  
M.F. Zawrah ◽  
Eman E. Ghanaym ◽  
H.E.H. Sadek ◽  
S.A. El Defrawy ◽  
Omym A.M. Ali
Keyword(s):  
Layered Double Hydroxides ◽  
Aluminum Dross ◽  
Double Hydroxides

scholarly journals Synthesis of Cryolite (Na3AlF6) from Secondary Aluminum Dross Generated in the Aluminum Recycling Process

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3871
Author(s):  
Bingbing Wan ◽  
Wenfang Li ◽  
Wanting Sun ◽  
Fangfang Liu ◽  
Bin Chen ◽  
...  
Keyword(s):  
National Standard ◽  
Molar Ratio ◽  
Recycling Process ◽  
Water Leaching ◽  
Secondary Aluminum ◽  
Co2 Gas ◽  
Aluminum Dross ◽  
Aluminum Recycling ◽  
Ignition Loss ◽  
Polyhedral Shape

Secondary aluminum dross (SAD) is regarded as a solid waste of aluminum recycling process that creates serious environmental and health concerns. However, SAD can also be used as a good source of aluminum, so that utilizing the SAD for the production of valuable products is a promising approach of recycling such waste. In the present work, a novel eco-friendly three-step process was proposed for the synthesis of cryolite (Na3AlF6) from the SAD, and it consisted of (1) water-washing pretreatment of SAD, (2) extraction of Al component via pyro-hydrometallurgy, including low-temperature alkaline smelting, water leaching and purification of leachate in sequence, (3) precipitation of cryolite from the purified NaAlO2 solution using the carbonation method. By analysis of the parameter optimization for each procedure, it was found that the maximum hydrolysis efficiency of aluminum nitride (AlN) in the SAD was around 68.3% accompanied with an extraction efficiency of Al reaching 91.5%. On this basis, the cryolite of high quality was synthesized under the following optimal carbonation conditions: reaction temperature of 75 °C, NaAlO2 concentration of 0.11 mol/L, F/(6Al) molar ratio of 1.10, and 99.99% CO2 gas pressure, and flow rate of 0.2 MPa and 0.5 L/min respectively. The formation of Na3AlF6 phase can be detected by XRD. The morphological feature observed by SEM revealed that the as-synthesized cryolite had a polyhedral shape (~1 μm size) with obvious agglomeration. The chemical composition and ignition loss of the as-synthesized cryolite complied well with the requirements of the Chinese national standard (GB/T 4291-2017).

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>

Antibiotic-anionic Clay Matrix Used for Drug Controlled Release

2018 ◽  
Vol 69 (2) ◽  
pp. 321-323
Author(s):  
Georgeta Zegan ◽  
Elena Mihaela Carausu ◽  
Loredana Golovcencu ◽  
Alina Sodor Botezatu ◽  
Eduard Radu Cernei ◽  
...  
Keyword(s):  
Controlled Release ◽  
Layered Double Hydroxides ◽  
Bioactive Molecules ◽  
Drug Controlled Release ◽  
Anionic Clays ◽  
Anionic Clay ◽  
Toxicological Studies ◽  
High Efficient ◽  
Clay Matrix ◽  
Double Hydroxides

Anionic clay matrix acting as drug controlled release system have shown in last years a great potential for delivery of bioactive molecules and chemical therapeutics. This organic-inorganic nanohybrid system is high efficient offering an excellent protection of intercalated compounds from degradation. Compared to other nanoparticles used in medical area, anionic clays type layered double hydroxides have found to be biocompatible according to toxicological studies. Ampicillin containing MgAlLDHs and ZnAlLDH samples have been prepared following two routes: anion-exchange procedure and reconstruction from calcined layered double hydroxides. Solid samples have been characterized by FTIR and SEM-EDX highlighting the alteration of pristine LDHs structure when the antibiotic is introduced in the interlayer gallery.

Nanohybrid Enzymes - Layered Double Hydroxides: Potential Applications

2006 ◽  
Vol 2 (3) ◽  
pp. 283-294 ◽  
Author(s):  
Claude Forano ◽  
Stephanie Vial ◽  
Christine Mousty
Keyword(s):  
Layered Double Hydroxides ◽  
Potential Applications ◽  
Double Hydroxides
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