authors |
Martins, NMR; Martins, LMDRS; Amorim, CO; Amaral, VS; Pombeiro, AJL |
nationality |
International |
journal |
CATALYSTS |
author keywords |
alcohol oxidation; ferrite magnetic nanoparticles; transition metals; magnetic recovery; functionalized nanoparticles; microwave irradiation; solvent-free |
keywords |
ASSISTED PEROXIDATIVE OXIDATION; AEROBIC OXIDATION; SELECTIVE OXIDATION; FE3O4 NANOPARTICLES; EFFICIENT CATALYST; ORGANIC FRAMEWORKS; NANO-ADSORBENT; REMOVAL; COMPLEXES; MICROSPHERES |
abstract |
A series of first-row transition-metals combined with ethylenediamine tetraacetic acid (EDTA), as metal-based N,O-chelating ligands, at the surface of ferrite magnetic nanoparticles (MNPs) was prepared by a co-precipitation method. Those EDTA functionalized MNPs with general formula Fe3O4@EDTA-M2+ [M = Mn2+ (1), Fe2+ (2), Co2+ (3), Ni2+ (4), Cu2+ (5) or Zn2+ (6)] were characterized by FTIR (Fourier Transform Infrared) spectroscopy, powder XRD (X-ray Diffraction), SEM (Scanning Electron Microscope), EDS (Energy Dispersive Spectrometer), VSM (Vibrating Sample Magnetometer) and TGA (Thermal Gravity Analysis). The application of the magnetic NPs towards the microwave-assisted oxidation of several alcohol substrates in a solvent-free medium was evaluated. The influence of reaction parameters such as temperature, time, type of oxidant, and presence of organic radicals was investigated. This study demonstrates that these MNPs can act as efficient catalysts for the conversion of alcohols to the corresponding ketones or aldehydes with high selectivity and yields up to 99% after 2 h of reaction at 110 degrees C using t-BuOOH as oxidant. Moreover, they have the advantage of being magnetically recoverable catalysts that can be easily recycled in following runs. |
publisher |
MDPI AG |
issn |
2073-4344 |
year published |
2017 |
volume |
7 |
issue |
11 |
digital object identifier (doi) |
10.3390/catal7110335 |
web of science category |
Chemistry, Physical |
subject category |
Chemistry |
unique article identifier |
WOS:000416780900024
|
ciceco authors
impact metrics
journal analysis (jcr 2019):
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journal impact factor |
3.52 |
5 year journal impact factor |
3.708 |
category normalized journal impact factor percentile |
59.434 |
dimensions (citation analysis):
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altmetrics (social interaction):
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