scholarly journals Palladium on Layered Double Hydroxide: A Heterogeneous System for the Enol Phosphate Carbon-Oxygen Bond Activation in Aqueous Media

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Jaqueline D. Senra ◽  
Aires C. Silva ◽  
Raquel V. Santos ◽  
Luiz Fernando B. Malta ◽  
Alessandro B. C. Simas
Keyword(s):  
Layered Double Hydroxide ◽  
Heterogeneous System ◽  
Bond Activation ◽  
Aqueous Media ◽  
Heck Cyclization ◽  
Catalyst Reusability ◽  
Double Hydroxide ◽  
Oxygen Bond ◽  
Enol Phosphate

In this work, a new catalytic approach for the C-O activation of enol phosphates based on a palladium supported on layered double hydroxide was developed. In this case, two different ketene aminal phosphates were used as models to study the synthesis ofα-phenyl enecarbamates N-Boc/CBz under the Suzuki-Miyaura conditions. The use of an ortho-bromoaniline as precursor allowed the synthesis of the 2-phenyl indole through an arylation/Heck cyclization. Catalyst reusability enabled the synthesis of the heterocycle in moderate yields for four consecutive runs.

scholarly journals Itaconic acid-modified layered double hydroxide as a ‎novel adsorbent for effective removal of Congo red from aqueous solutions

2021 ◽  
Author(s):  
Mohammad Dinari ◽  
Shirin Shabani
Keyword(s):  
Layered Double Hydroxide ◽  
Itaconic Acid ◽  
Congo Red ◽  
Aqueous Media ◽  
Freundlich Isotherm ◽  
Second Order ◽  
Order Kinetic ◽  
Solution Ph ◽  
Pseudo Second Order ◽  
Double Hydroxide

Abstract Herein, we report the synthesis of Cu-Ca-Al/NO3-based layered double hydroxide through co-precipitation methodology. The prepared layered double hydroxide was then modified with itaconic acid. The physicochemical properties of the prepared materials were studied using Fourier transform-infrared spectroscopy, scanning electron microscopy, X-ray diffraction analysis, thermogravimetric analysis, and nitrogen adsorption/desorption technique. The prepared materials were then applied as novel adsorbents for the removal of Congo red as a model of an anionic dye from aqueous media. To reach maximum adsorption, the effect of parameters including sample solution pH, adsorbent amount, contact time, and initial concentration of Congo red on the adsorption process was investigated. Kinetic studies were also conducted to study the mechanism of adsorption. In this regard, the kinetic models of pseudo-first-order, pseudo-second-order, Elovich, and intra-particle diffusion were studied. The results showed that the adsorption of Congo red onto Cu-Ca-Al-LDH and LDH-ITA adsorbents followed the pseudo-second-order kinetic model. To evaluate the equilibrium adsorption data, different isotherms including Langmuir, Freundlich, and Dubinin-Radushkevich were also applied. The data revealed that the Freundlich isotherm provided the best fit with the equilibrium data of both adsorbents. Maximum adsorption capacities of 81 and 84 mg g− 1 were obtained using Cu-Ca-Al-LDH and LDH-ITA adsorbents, respectively.

MgAl-Layered double hydroxide for amoxicillin removal from aqueous media

2020 ◽  
pp. 1-23
Author(s):  
Amina Elhaci ◽  
Fatima Labed ◽  
Aicha Khenifi ◽  
Zohra Bouberka ◽  
Mostefa Kameche ◽  
...  
Keyword(s):  
Layered Double Hydroxide ◽  
Aqueous Media ◽  
Amoxicillin Removal ◽  
Double Hydroxide

Removal of Radiocesium from Aqueous Media with Zinc–Aluminum Layered Double Hydroxide Intercalated with Copper(II) Hexacyanoferrate

2018 ◽  
Vol 60 (4) ◽  
pp. 395-399 ◽  
Author(s):  
G. N. Pshinko ◽  
L. N. Puzyrnaya ◽  
V. S. Shunkov ◽  
A. A. Kosorukov ◽  
V. Ya. Demchenko
Keyword(s):  
Layered Double Hydroxide ◽  
Aqueous Media ◽  
Double Hydroxide

scholarly journals Advances in layered double hydroxide-based ternary nanocomposites for photocatalysis of contaminants in water

2020 ◽  
Vol 9 (1) ◽  
pp. 1381-1396
Author(s):  
Hao Sun ◽  
Young-Jung Heo ◽  
Ji-Hye Park ◽  
Kyong Yop Rhee ◽  
Soo-Jin Park
Keyword(s):  
Layered Double Hydroxide ◽  
Heavy Metal Ions ◽  
Photocatalytic Performance ◽  
Low Cost ◽  
Aqueous Media ◽  
Energy Crisis ◽  
Electron Hole ◽  
Light Utilization ◽  
Double Hydroxide ◽  
Photocatalytic Applications

Abstract Recently, photocatalysis technology has been widely considered as an effective method for solving environmental pollution issues and addressing the energy crisis. Hybrids of layered double hydroxide (LDH) exhibit excellent photocatalytic properties for use in the field of wastewater treatment due to the large interlayer spaces, chemical stability, and low cost. However, pristine LDH suffers from numerous limitations, such as insufficient visible light utilization and a high recombination rate of electron–hole pairs, resulting in degradation of photocatalytic performance. Recent advancements have demonstrated that LDH-based hybrids are suitable nanocomposites for photocatalytic applications when combining LDH with other semiconductors. This article summarizes the progress in the field of LDH-based ternary composites with emphasis on the removal of organic pollutants and heavy metal ions from aqueous media. Moreover, the applications and synthesis of LDH-based ternary composites, including corresponding examples, are discussed. In addition, the interaction mechanisms between photocatalysts and contaminants in water are comprehensively explained. Finally, the review provides insights into the challenges and prospects for the advancement of LDH-based photocatalysts.

scholarly journals Synthesis of Co–Al layered double hydroxide nanoclusters as reduction nanocatalyst in aqueous media

2017 ◽  
Vol 5 (4) ◽  
pp. 466-471 ◽  
Author(s):  
Daisuke Kino ◽  
Yasuaki Tokudome ◽  
Pedro D. Vaz ◽  
Carla D. Nunes ◽  
Masahide Takahashi
Keyword(s):  
Layered Double Hydroxide ◽  
Aqueous Media ◽  
Double Hydroxide

Removal of U(VI) from aqueous media with layered double hydroxide of Zn and Al, intercalated with hexacyanoferrate(II) ions

2015 ◽  
Vol 57 (6) ◽  
pp. 616-620 ◽  
Author(s):  
G. N. Pshinko ◽  
L. N. Puzyrnaya ◽  
B. P. Yatsik ◽  
A. A. Kosorukov
Keyword(s):  
Layered Double Hydroxide ◽  
Aqueous Media ◽  
Double Hydroxide

Extraction of Eu(III) from Aqueous Media with Zn,Al-Layered Double Hydroxide, Intercalated with EDTA Ions, and Its Magnetic Composite

2021 ◽  
Vol 63 (3) ◽  
pp. 325-333
Author(s):  
G. N. Pshinko ◽  
L. N. Puzyrnaya ◽  
A. A. Kosorukov ◽  
B. P. Yatsik ◽  
V. S. Shunkov
Keyword(s):  
Layered Double Hydroxide ◽  
Aqueous Media ◽  
Magnetic Composite ◽  
Double Hydroxide

Removal of Methyl Orange from Aqueous Solutions by Using Zn-Al Layered Double Hydroxide as Photocatalyst

2015 ◽  
Vol 1 (2) ◽  
pp. 36-41
Author(s):  
Laura Cocheci ◽  
◽  
Ancuta-Corina Marcu ◽  
Paul Barvinschi ◽  
Aniela Pop
Keyword(s):  
Methyl Orange ◽  
Aqueous Solutions ◽  
Layered Double Hydroxide ◽  
Double Hydroxide
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