Magnetically recoverable catalysts based on mono- or bis-(NHC) complexes of palladium for the Suzuki–Miyaura reaction in aqueous media: two NHC–Pd linkages are better than one

2016 ◽  
Vol 45 (29) ◽  
pp. 11633-11638 ◽  
Author(s):  
Francisco Martínez-Olid ◽  
Román Andrés ◽  
Ernesto de Jesús ◽  
Juan C. Flores ◽  
Pilar Gómez-Sal ◽  
...  
Keyword(s):  
Magnetic Particles ◽  
Aqueous Media ◽  
Recyclable Catalyst ◽  
Magnetically Recoverable Catalysts ◽  
Recoverable Catalysts ◽  
Pd Complexes ◽  
Better Than

Mono- and bis(NHC) Pd complexes grafted onto magnetic particles are compared as catalysts in the Suzuki–Miyaura reaction in aqueous media. The latter is found to be an outstanding recyclable catalyst.

Efficient one-pot click synthesis of β-hydroxy-1,2,3-triazoles catalyzed by copper(i)@phosphorated SiO2via multicomponent reaction in aqueous media

2014 ◽  
Vol 38 (11) ◽  
pp. 5429-5435 ◽  
Author(s):  
Hossein Naeimi ◽  
Vajihe Nejadshafiee
Keyword(s):  
Multicomponent Reaction ◽  
Aqueous Media ◽  
Recyclable Catalyst ◽  
One Pot ◽  
Click Synthesis

Cu(i)@phosphorated SiO2 as novel, eco-friendly, easy to prepare, recyclable catalyst for the synthesis of β-hydroxy-1,2,3-triazoles in water is reported.

Magnetorheological fluid based on amorphous Fe-Si-B alloy magnetic particles

2021 ◽  
pp. 1045389X2110643
Author(s):  
Chuncheng Yang ◽  
Zhong Liu ◽  
Xiangyu Pei ◽  
Cuiling Jin ◽  
Mengchun Yu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Rheological Property ◽  
Magnetic Particles ◽  
Annealing Treatment ◽  
Magnetorheological Fluid ◽  
The Stability ◽  
The Magnetic Field ◽  
Amorphous Particle ◽  
Better Than

Magnetorheological fluids (MRFs) based on amorphous Fe-Si-B alloy magnetic particles were prepared. The influence of annealing treatment on stability and rheological property of MRFs was investigated. The saturation magnetization ( Ms) of amorphous Fe-Si-B particles after annealing at 550°C is 131.5 emu/g, which is higher than that of amorphous Fe-Si-B particles without annealing. Moreover, the stability of MRF with annealed amorphous Fe-Si-B particles is better than that of MRF without annealed amorphous Fe-Si-B particles. Stearic acid at 3 wt% was added to the MRF2 to enhance the fluid stability to greater than 90%. In addition, the rheological properties demonstrate that the prepared amorphous particle MRF shows relatively strong magnetic responsiveness, especially when the magnetic field strength reaches 365 kA/m. As the magnetic field intensified, the yield stress increased dramatically and followed the Herschel-Bulkley model.

Sunlight assisted degradation of dye molecules and reduction of toxic Cr(vi) in aqueous medium using magnetically recoverable Fe3O4/reduced graphene oxide nanocomposite

RSC Advances ◽  
2016 ◽  
Vol 6 (13) ◽  
pp. 11049-11063 ◽  
Author(s):  
Purna K. Boruah ◽  
Priyakshree Borthakur ◽  
Gitashree Darabdhara ◽  
Chaitanya K. Kamaja ◽  
Indrapal Karbhal ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Aqueous Medium ◽  
Reduced Graphene Oxide ◽  
Dye Molecules ◽  
Reduced Graphene ◽  
Magnetically Recoverable Catalysts ◽  
Recoverable Catalysts ◽  
Photocatalytic Applications

In view of the significant impact of magnetically recoverable catalysts in photocatalytic applications, Fe3O4/rGO nanocomposite photocatalyst was synthesized and utilized as an efficient photocatalyst for the degradation of dye molecules and reduction of the toxic Cr(vi).

scholarly journals Silica-Supported Co3O4 Nanoparticles as a Recyclable Catalyst for Rapid Degradation of Azodye

2016 ◽  
Vol 11 (3) ◽  
pp. 284 ◽  
Author(s):  
Ali Baghban ◽  
Esmail Doustkhah ◽  
Sadegh Rostamnia ◽  
Khadijeh Ojaghi Aghbash
Keyword(s):  
Silica Nanoparticles ◽  
Aqueous Media ◽  
Oxidative Degradation ◽  
Ammonium Persulfate ◽  
Recyclable Catalyst ◽  
Co3o4 Nanoparticles ◽  
Media Effect ◽  
Rapid Degradation ◽  
Ft Ir ◽  
20 Nm

<p>In this paper, silica nanoparticles with particle size of ~ 10-20 nm were selected as a support for the synthesis of Co<sub>3</sub>O<sub>4</sub> nanoparticles by impregnation of silica nanoparticles in solution of Co(II) in a specific concentrations and then calcination to 800 <sup>o</sup>C. This nanocomposite was then, used as a catalyst for oxidative degradation of methyl orange (MO) with ammonium persulfate in aqueous media. Effect of pH, temperature, contact time, amount of oxidant and catalyst were studied in the presence of manuscript. Scanning electron microscope (SEM), electron dispersive spectroscopy (EDS), FT-IR, and ICP-AES analyses were used for analysis of silica-supported Co<sub>3</sub>O<sub>4</sub> (Co<sub>3</sub>O<sub>4</sub>/SiO<sub>2</sub>). Treating MO with ammonium persulfate in the presence of Co<sub>3</sub>O<sub>4</sub>/SiO<sub>2 </sub>led to complete degradation of MO under the optimized conditions. Also, the catalyst exhibited recyclability at least over 10 consecutive runs. Copyright © 2016 BCREC GROUP. All rights reserved</p><p><em>Received: 12<sup>nd</sup> December 2015; Revised: 27<sup>th</sup> January 2016; Accepted: 27<sup>th</sup> January 2016</em></p><p><strong>How to Cite</strong>: Baghban, A., Doustkhah, E., Rostamnia, S., Aghbash, K.O. (2016). Silica-Supported Co<sub>3</sub>O<sub>4</sub> Nanoparticles as a Recyclable Catalyst for Rapid Degradation of Azodye. <em>Bulletin of Chemical Reaction Engineering &amp; Catalysis</em>, 11 (3): 284-291 (doi:10.9767/bcrec.11.3.568.284-291)</p><p><strong>Permalink/DOI</strong>: <a href="http://doi.org/10.9767/bcrec.11.3.568.284-291">http://doi.org/10.9767/bcrec.11.3.568.284-291</a></p>

Palladium-Schiff-base-silica framework as a robust and recyclable catalyst for Suzuki–Miyaura cross-coupling in aqueous media

RSC Advances ◽  
2015 ◽  
Vol 5 (48) ◽  
pp. 38085-38092 ◽  
Author(s):  
Tahshina Begum ◽  
Manoj Mondal ◽  
Pradip K. Gogoi ◽  
Utpal Bora
Keyword(s):  
Schiff Base ◽  
Catalytic Activity ◽  
Room Temperature ◽  
Aqueous Media ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Recyclable Catalyst ◽  
Cross Coupling Reaction

A novel Pd@imine-SiO2 catalyst was prepared and found to exhibit excellent catalytic activity in a Suzuki-Miyaura cross-coupling reaction under aqueous media at room temperature.

scholarly journals Facile Synthesis of Ultralight and Porous Melamine-Formaldehyde (MF) Resin-Derived Magnetic Graphite-Like C3N4/Carbon Foam with Electromagnetic Wave Absorption Behavior

Crystals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 656 ◽  
Author(s):  
Yihan Zhao ◽  
Yao Zhang ◽  
Ru Li ◽  
Zhaoshun Wang ◽  
Zhichao Lou ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Magnetic Particles ◽  
Carbon Foam ◽  
Absorption Capacity ◽  
Melamine Formaldehyde ◽  
Multiple Reflections ◽  
Matching Effect ◽  
Broad Absorption Band ◽  
Better Than

Society demands effective electromagnetic wave (EMW) absorbers that are lightweight, with a broad absorption band and strong absorption, to solve excessive electromagnetic radiation. Herein, ultralight magnetic graphite-like C3N4/carbon foam (MCMF) was fabricated via impregnating polymerized melamine formaldehyde (MF) foams in Fe3O4 nanoparticle solution, followed by in situ pyrolysis at 1000 °C. MCMF possesses porous architectures consisting of graphitic C3N4/carbon and CFe15.1. The magnetic particles (α-Fe, Fe3O4 and Fe3C) were formed and modified on the internal skeleton surface. The EMW absorption capacity of MCMF is better than the that of carbonized MF foam without Fe3O4 (CMF), possessing excellent absorption behavior, with a minimum RL value of −47.38 dB and a matching thickness as thin as 3.90 mm. The corresponding effective absorbing bandwidth is as broad as 13.32 GHz. Maxwell–Wagner–Sillars (MWS) polarization and the residual loss are proved to be beneficial for such superior absorption behavior. Besides, graphitic C3N4 enriches the interface polarization effect and the electromagnetic matching effect. The microporous structures are beneficial for increasing EMW propagation, resulting in internal multiple reflections and scatterings, which are also beneficial for EMW attenuation.

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