Synthesis, characterizations of pure and Co2+ doped iron oxide nanoparticles for magnetic applications

Subash, M.; Chandrasekar, M.; Panimalar, S.; Inmozhi, C.; Uthrakumar, R.

doi:10.1016/j.matpr.2021.10.340

Cited by 3 publications

(2 citation statements)

References 14 publications

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“…When stabilized with polyethyleneimine, the reflex diffraction patterns revealed several phases of iron oxides -γ-Fe2O3, α-Fe2O3, ε-Fe2O3. The diffraction reflections for cobalt oxide correspond to spinel Co3O4 [37,38,42,[57][58][59][60]. 2 show the Mössbauer spectrum of composites obtained at room temperature belonging to iron oxides in a magnetically ordered state.…”

Section: Characterization Of Magnetic Compositesmentioning

confidence: 99%

“…This is due to the fact that iron is characterized by low cost, is widely distributed in soils, iron is non-toxic and has unique magnetic properties. Among the oxides of variable metals, iron oxides and their composites are used with great success [33][34][35][36][37][38][39][40]. They are used not only in the field of electronics, medicine, protection and purification of the environment from various pollutants such as phenol and its derivatives, but also due to their cheapness, good thermal stability, high specific surface area as heterogeneous catalysts in complete and partial oxidation reactions.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, Characterization of Magnetic Composites and Testing of Their Activity in Liquid-phase Oxidation of Phenol with Oxygen

Dossumova¹,

Shakiyeva²,

Muktaly³

et al. 2022

Preprint

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The development and improvement of methods for the synthesis of environmentally friendly catalysts based on base metals is currently an urgent and promising task of modern catalysis. Catalysts based on nanoscale magnetite and maghemite have fast adsorption-desorption kinetics and high chemical activity. The purpose of this work was to obtain magnetic composites, determine their physicochemical characteristics and verify their activity in the process of liquid-phase oxidation of phenol with oxygen. Magnetic nanocomposites were obtained by chemical co-deposition of salts of ferrous and trivalent iron. The synthesized magnetic composites were studied by X-ray diffractometry, energy dispersive X-ray fluorescence and Mössbauer spectroscopy, IR-Fourier spectroscopy, elemental analysis. To increase the catalytic activity in oxidative processes, the magnetite surfaces were modified using cobalt nitrate salt. Further, CoFe2O4 was stabilized by adding polyethylenimine (PEI) as a surfactant. Preliminary studies of the oxidation of phenol with oxygen, as the most typical environmental pollutant were carried out on the obtained Fe3O4, CuFe2O4, CoFe2O4/PEI catalysts. The spectrum of the reaction product shows the presence of CH in the aromatic ring and double C=C bonds, stretching vibrations of the C=O groups of carbonyl compounds; the band at 3059 cm–1 corresponds to the presence of double C=C bonds, the band at 3424 cm–1 hydroquinone compounds. The band at 1678 cm–1 and the intense band at 1646 cm–1 refer to vibrations of the С=О bonds of the carbonyl group of benzoquinone. Peaks at 1366 cm–1 and 1310 cm–1 can be related to the vibrations of C–H and C–C bonds of the quinone ring. Thus it was demonstrated that produced magnetic composites based on iron oxide are quite effective in the oxidation of phenol with oxygen.

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Section: Characterization Of Magnetic Compositesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization of Magnetic Composites and Testing of Their Activity in Liquid-phase Oxidation of Phenol with Oxygen

Dossumova¹,

Shakiyeva²,

Muktaly³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

Ternary iron-cobalt-molybdenum hybrid for synergistically enhanced electrochemical water oxidation

Hou

Quan

Lin

et al. 2023

Electrochimica Acta

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Synthesis, Characterization of Magnetic Composites and Testing of Their Activity in Liquid-Phase Oxidation of Phenol with Oxygen

et al. 2022

View full text Add to dashboard Cite

The development and improvement of methods for the synthesis of environmentally friendly catalysts based on base metals is currently an urgent and promising task of modern catalysis. Catalysts based on nanoscale magnetite and maghemite have fast adsorption–desorption kinetics and high chemical activity. The purpose of this work is to obtain magnetic composites, determine their physicochemical characteristics and verify their activity in the process of liquid-phase oxidation of phenol with oxygen. Magnetic nanocomposites were obtained by chemical co-deposition of salts of ferrous and trivalent iron. The synthesized magnetic composites were studied by X-ray diffractometry, energy dispersive X-ray fluorescence and Mössbauer spectroscopy, IR-Fourier spectroscopy and elemental analysis. To increase the catalytic activity in oxidative processes, the magnetite surfaces were modified using cobalt nitrate salt. Further, CoFe2O4 was stabilized by adding polyethylenimine (PEI) as a surfactant. Preliminary studies of the oxidation of phenol with oxygen, as the most typical environmental pollutant were carried out on the obtained Fe3O4, CoFe2O4, CoFe2O4/PEI catalysts. The spectrum of the reaction product shows the presence of CH in the aromatic ring and double C=C bonds, stretching vibrations of the C=O groups of carbonyl compounds; the band at 3059 cm−1 corresponds to the presence of double C=C bonds and the band at 3424 cm−1 to hydroquinone compounds. The band at 1678 cm−1 and the intense band at 1646 cm−1 refer to vibrations of the C=O bonds of the carbonyl group of benzoquinone. Peaks at 1366 cm−1 and 1310 cm−1 can be related to the vibrations of C–H and C–C bonds of the quinone ring. Thus, it was demonstrated that produced magnetic composites based on iron oxide are quite effective in the oxidation of phenol with oxygen.

show abstract

Synthesis, characterizations of pure and Co2+ doped iron oxide nanoparticles for magnetic applications

Cited by 3 publications

References 14 publications

Synthesis, Characterization of Magnetic Composites and Testing of Their Activity in Liquid-phase Oxidation of Phenol with Oxygen

Synthesis, Characterization of Magnetic Composites and Testing of Their Activity in Liquid-phase Oxidation of Phenol with Oxygen

Ternary iron-cobalt-molybdenum hybrid for synergistically enhanced electrochemical water oxidation

Synthesis, Characterization of Magnetic Composites and Testing of Their Activity in Liquid-Phase Oxidation of Phenol with Oxygen

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