scholarly journals Rapid Microwave-Assisted Synthesis of Fe3O4/SiO2/TiO2 Core-2-Layer-Shell Nanocomposite for Photocatalytic Degradation of Ciprofloxacin

Catalysts ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1136
Author(s):  
Ivana Gabelica ◽  
Lidija Ćurković ◽  
Vilko Mandić ◽  
Ivana Panžić ◽  
Davor Ljubas ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Protective Layer ◽  
Magnetic Core ◽  
Microwave Assisted Synthesis ◽  
Core Shell ◽  
Organic Micropollutants ◽  
Microwave Assisted ◽  
Magnetite Fe3o4 ◽  
Composite Configuration ◽  
Powder Suspension

In this work, magnetic nanoparticles based on magnetite were successfully prepared via rapid microwave-assisted synthesis. In order to obtain the ternary core–shell Fe3O4/SiO2/TiO2 nanocomposite, first magnetite (Fe3O4) nanoparticles were coated with a protective layer of silica (SiO2) and finally with titania (TiO2). The composite configuration comprising porous and photoactive shells should facilitate the removal of organic micropollutants (OMPs) from water. Furthermore, the magnetic core is critical for processing the management of the photocatalytic powder suspension. The magnetization of the prepared magnetic nanoparticles was confirmed by vibrating-sample magnetometry (VSM), while the structure and morphology of the core–shell nanocomposite were investigated by means of XRD, FTIR, and SEM. Adsorption and photocatalysis were evaluated by investigating the removal efficiency of ciprofloxacin (CIP) as a model OMP using the prepared magnetic core–shell nanocomposite under UV-A light irradiation. It was found that the Fe3O4/SiO2/TiO2 nanocomposite showed good synergistic adsorption and photocatalytic properties. The measurement of iron in eluate confirmed that no leaching occurred during the photocatalytic examination. The recovery of magnetic nanocomposite by an external magnetic field confirmed that the magnetically separated catalyst is highly suitable for recycling and reuse.

scholarly journals Microwave-Assisted Synthesis Core-Fe3O4 Shell-Au Cubic Nanoparticles

2011 ◽  
Vol 2011 ◽  
pp. 1-3
Author(s):  
Manuel Ramos ◽  
Karina Castillo ◽  
Domingo A. Ferrer ◽  
Rurik J. Farias ◽  
Sergio Flores ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Field Emission ◽  
Au Nanoparticles ◽  
Microwave Assisted Synthesis ◽  
Core Shell ◽  
X Ray ◽  
Microwave Assisted

Core-Shell (Fe3O4/Au) nanoparticles were synthesized using iron II chloride tetrahydrate (FeCl2H2O) and potassium tetrachloroaurate III (AuCl4K) precursors under microwave-assisted conditions. Products were analyzed using field emission gun electron microscope in transmission and scanning modes; energy disperse X-ray spectroscopy performed during STEM measurements indicated a signal for gold K and M signals at 9 keV and 13 keV, respectively, confirming Au atoms at nanoparticle's perimeter and Fe-L signal at 8 keV to be at the center.

Microwave-assisted Efficient One-pot Synthesis of Nitriles Using Recyclable Magnetite (Fe3O4) Nanoparticles as Catalyst and Water as Solvent: A Greener Approach

2020 ◽  
Vol 10 (4) ◽  
pp. 507-517
Author(s):  
Prashant Chavan ◽  
Suhas Pednekar ◽  
Ramesh Chaughule ◽  
Anushree Lokur
Keyword(s):  
Fe3o4 Nanoparticles ◽  
Reaction Medium ◽  
Chemical Yield ◽  
Significant Loss ◽  
Microwave Assisted Synthesis ◽  
Microwave Activation ◽  
One Pot ◽  
Microwave Assisted ◽  
Magnetite Fe3o4 ◽  
Water As Solvent

Background: There has been an increasing curiosity over the past few years to carry out organic reactions over heterogeneous nanocatalysts. Microwave activation coupled with a nanocatalyst along with water as a reaction medium makes the process further green. Microwave activation as a green process reduces reaction times, enhances product purity and improves chemical yield. Methods: Nitrile group chemistry has been explored by many researchers across the globe owing to its interesting properties and its importance in synthetic chemistry. Despite several methods being available for the synthesis of nitriles, microwave assisted synthesis of nitriles using Fe3O4 nanoparticles appears more promising. The present study is intended at developing a recyclable magnetite (Fe3O4) nanoparticles catalyzed protocol towards the synthesis of organonitrile derivatives using one pot reaction. Results: The above protocol incorporates the use of microwave for heating and water as reaction medium. Several substituted nitriles could be synthesized for excellent yields. The magnetite nanoparticles can be reused for new reaction without significant loss in activity. Conclusion: The experiment makes the protocol simple, environment friendly and economically feasible.

A Novel Method for the Synthesis of Core-shell Magnetic Nanoparticle

2016 ◽  
Vol 66 (4) ◽  
pp. 291 ◽  
Author(s):  
D. Mukherji
Keyword(s):  
Magnetic Nanoparticles ◽  
Contrast Agent ◽  
Synthesis Method ◽  
Chemical Separation ◽  
Magnetic Core ◽  
Superparamagnetic Nanoparticles ◽  
Iron Oxide Nanoparticle ◽  
Core Shell ◽  
Shell Type ◽  
Wide Range

<p>Core-shell type magnetic nanoparticles are finding attractive applications in biomedicine, from diagnostic to cancer therapy. Both for targeted drug delivery and hyperthermia, as well as a contrast agent used for external biomedical imaging systems, small (&lt; 20 nm) superparamagnetic nanoparticles are desired. Some iron oxide nanoparticle formulations are already approved for human administration as contrast agent for magnetic resonance imaging. However, search continues for nanoparticles with higher saturation magnetisation. Metallic, bi-metallic and intermetallic magnetic nanoparticles are finding attention. Biocompatibility and optimal clearance are important criteria for the medical applications and therefore core-shell type particles are favored, where a biocompatible shell (e.g. polymer, Silica) can prevent inadvertent host reaction with the magnetic core. A recently developed novel synthesis method (electrochemical selective phase dissolution - ESPD), which can produce core-shell magnetic nanoparticles, is reviewed in this paper. ESPD, as the name suggests, uses electro-chemical separation of a phase from metallic alloys to synthesize nanoparticles. It is a versatile method and can be adopted to produce a wide range of nanostructures in addition to the core-shell magnetic nanoparticles.</p>

Microwave Assisted Formation of Magnetic Core-Shell Carbon Nanostructure

2013 ◽  
Vol 2 (12) ◽  
pp. M65-M68 ◽  
Author(s):  
H. Gu ◽  
D. Ding ◽  
P. Sameer ◽  
J. Guo ◽  
N. Yerra ◽  
...  
Keyword(s):  
Magnetic Core ◽  
Core Shell ◽  
Carbon Nanostructure ◽  
Microwave Assisted

scholarly journals Key Parameters on the Microwave Assisted Synthesis of Magnetic Nanoparticles for MRI Contrast Agents

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Maria Eugênia Fortes Brollo ◽  
Sabino Veintemillas-Verdaguer ◽  
Cesar Menor Salván ◽  
Maria del Puerto Morales
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Contrast Agents ◽  
Saturation Magnetization ◽  
Synthesis Method ◽  
Mri Contrast Agents ◽  
Microwave Assisted Synthesis ◽  
Organic Media ◽  
Experimental Conditions ◽  
Microwave Assisted

Uniform iron oxide magnetic nanoparticles have been synthesized using a microwave assisted synthesis method in organic media and their colloidal, magnetic, and relaxometric properties have been analyzed after its transference to water and compared with those nanoparticles prepared by thermal decomposition in organic media. The novelty of this synthesis relies on the use of a solid iron oleate as precursor, which assures the reproducibility and scalability of the synthesis, and the microwave heating that resulted in being faster and more efficient than traditional heating methods, and therefore it has a great potential for nanoparticle industrial production. The effect of different experimental conditions such as the solvent, precursor, and surfactant concentration and reaction time as well as the transference to water is analyzed and optimized to obtain magnetic iron oxide nanoparticles with sizes between 8 and 15 nm and finally colloids suitable for their use as contrast agents on Magnetic Resonance Imaging (MRI). The r2 relaxivity values normalized to the square of the saturation magnetization were shown to be constant and independent of the particle size, which means that the saturation magnetization is the main parameter controlling the efficiency of these magnetic nanoparticles as MRI T2-contrast agents.

Research Development on the Preparation of Gold-Coated Magnetic Nanoparticles

2011 ◽  
Vol 391-392 ◽  
pp. 381-384 ◽  
Author(s):  
Yan Liu
Keyword(s):  
Magnetic Nanoparticles ◽  
Magnetic Core ◽  
Core Shell ◽  
Alloy Nanoparticles ◽  
Research Development ◽  
Unique Combination ◽  
Preliminary Work ◽  
Wide Range ◽  
Coated Alloy

The study of core@shell magnetic nanoparticles (MNPs) has a wide range of applications because of the unique combination of the nanoscale magnetic core and the functional shell. In this paper, a brief review is presented on the different methods for the preparation of gold-coated composite magnetic nanoparticles, along with our preliminary work on the synthesis of gold-coated alloy nanoparticles.

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