The co-adsorption of Cu2+ and Zn2+ with adsorption sites surface-lattice reforming on calcined layered double hydroxides

RSC Advances ◽  
2015 ◽  
Vol 5 (36) ◽  
pp. 28369-28378 ◽  
Author(s):  
Yuxin Xiao ◽  
Mingming Sun ◽  
Lin Zhang ◽  
Xue Gao ◽  
Jixin Su ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
Co Adsorption ◽  
Adsorption Sites ◽  
Surface Lattice ◽  
Double Hydroxides

The picture shows that how the CLDHs recover into the hydrotalcite structure in the process of adsorption of Cu2+ and Zn2+.

VSC Adsorptive Property of Zinc or Iron Oxide in Comparison with that of Layered Double Hydroxide Containing Zinc of Iron

2018 ◽  
Vol 782 ◽  
pp. 250-255 ◽  
Author(s):  
Yoshiyuki Yokogawa ◽  
Kodai Kakehashi ◽  
Hidemitsu Wakabayashi ◽  
Kazuki Oike ◽  
Yuki Morita ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Layered Double Hydroxide ◽  
Layered Double Hydroxides ◽  
High Capacity ◽  
Periodontal Pocket ◽  
Pharmaceutical Drugs ◽  
Adsorptive Property ◽  
Adsorption Sites ◽  
Double Hydroxide ◽  
Double Hydroxides

Bad breath is mainly caused by malodorous materials, volatile sulfur compounds (VSC), hydrogen sulfide (H2S). Pharmaceutical drugs should be effective but limited, because bacteria at deep periodontal pocket may be sterilized but cannot be washed out and the malodorous compounds remain. The absorbents for the malodorous compounds are expected to prevent the teeth from decaying and peiodontics disease. The layered double hydroxides, of which composition is A1-xBx(OH)2Cx/n·mH2O, where A and B are zinc and Fe ions are effective as the absorbents for VSC. The VSC adsorption capabilities of zinc or iron oxide in comparison with that of layered double hydroxides containing zinc or iron ion. The high capacity of sulfide adsorption of layered double hydroxide may be due to the large number of adsorption sites of layered double hydroxide materials. The layered double hydroxides (LDH) have a structure favorable for ion or free molecules exchange, and high affinity with sulfide may be involved in iron or zinc containing LDH materials.

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

Heterostructures of Ce-Ti/layered double hydroxides and the derived MMOs for photoenergy applications

2020 ◽  
Vol 513 ◽  
pp. 145853 ◽  
Author(s):  
Valentina Chivu ◽  
Diana Gilea ◽  
Nicoleta Cioatera ◽  
Gabriela Carja ◽  
Mihaela Mureseanu
Keyword(s):  
Layered Double Hydroxides ◽  
Double Hydroxides
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