Effect of heat-treatment temperature and zinc addition on magnetostructural and surface properties of manganese nanoferrite prepared by an ecofriendly sol–gel synthesis

Dippong, Thomas; Deac, I. G.; Lazăr, Mihaela D.; Petean, Ioan; Levei, Erika Andrea; Borodi, Gheorghe; Cadar, Oana

doi:10.1016/j.jmrt.2021.11.073

Cited by 4 publications

(3 citation statements)

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“…Area I incorporates Zn and O, and area II incorporates Fe and O, which proves that particles after annealing decompose into large, agglomerated Fe x O y particles and smaller, weakly bonded ZnO particles. It has previously been reported that hematite (α-Fe 2 O 3 ) appears and disappears during the annealing of zinc ferrite nanoparticles in air or oxygen-rich atmospheres . It was argued that this process is controlled by the oxygen partial pressure.…”

Section: Resultsmentioning

confidence: 99%

“…It has previously been reported that hematite (α-Fe 2 O 3 ) appears and disappears during the annealing of zinc ferrite nanoparticles in air or oxygen-rich atmospheres. 73 It was argued that this process is controlled by the oxygen partial pressure. On the other hand, as reported earlier by the authors, under inert conditions, nonisothermal annealing up to 1400 °C of ZFN led to their partial decomposition (∼24%).…”

Section: Resultsmentioning

confidence: 99%

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Thermal Decomposition Pathways of Zn_xFe_3–xO₄ Nanoparticles in Different Atmospheres

Kuciakowski

Stȩpień

Żukrowski

et al. 2022

Ind. Eng. Chem. Res.

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This article shows how initial composition and thermal treatment of nonstoichiometric zinc ferrite nanoparticles (nZFN) can be chosen to adjust the structure and cation distribution and enhance magnetism in the resulting nanoscale material. It also provides insight into new prospects regarding the production and design of nanoscale materials. Investigations were conducted before and after heating of nZFN in an inert atmosphere and a vacuum up to temperature of 1170 °C. Annealing leads to partial reduction of Fe ions, enhanced magnetism, and an increase in the size of the particles independent of the atmosphere. Use of the inert atmosphere delivers a solid solution of magnetite and zinc ferrite with a reduced Zn content in the structure as a result of sublimation of newly formed ZnO and reduction of Fe, and it favors crystallization. A preference for normal-spinel phase and enhancement of magnetic saturation from 20 Am2/kg up to 101 Am2/kg was observed. Vacuum annealing with high probability produces ZnO, Fe3O4, and Fe2O3 multiphase system with signs of amorphization, mainly on the surface. A large fraction of Fe ions is reduced and the volume ratio of Fe3O4 to Fe2O3 increases with heating time. The final solid product from a complete decomposition of ZFN is magnetite.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Thermal Decomposition Pathways of Zn_xFe_3–xO₄ Nanoparticles in Different Atmospheres

Kuciakowski

Stȩpień

Żukrowski

et al. 2022

Ind. Eng. Chem. Res.

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“…There are several methods to produce ferrites. The sol-gel method is a technique with high reproducibility, the control of the structural and morphological properties, and the certainty of obtaining a magnetic nanomaterial (Kiani et al, 2021;Dippong et al, 2021;Giannakopoulou et al, 2002). After the sol-gel synthesis, heat treatment is necessary to ensure the nanomaterial thermo-stability.…”

Section: Introductionmentioning

confidence: 99%

Magnetic CoFe2O4@carbon yolk-shell nanoparticles as catalysts for the catalytic wet peroxide oxidation of paracetamol: kinetic insights

2022

Global NEST: The International Journal

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<p>This work focuses on the use of carbon-coated magnetic cobalt ferrite nanoparticles as catalysts for catalytic wet peroxide oxidation (CWPO) of the emerging concern pollutant paracetamol (PCM). The magnetic core of the catalyst is composed of CoFe2O4 developed by a sol-gel method. The core is subsequently coated with a formaldehyde-resorcinol resin and TEOS, further carbonized at 600 ºC, and etched with NaOH to create a yolk-shell structure denoted as CoFe2O4@void@C. X-ray diffraction (XRD), transmission electron microscopy (TEM), and Fourier transformed infra-red (FTIR) analysis revealed that the uncoated core is composed of a CoFe2O4 cubic spinel structure with a crystallite size of 53 nm calculated using the Williamson-Hall (W-H) method, matching very well the average size observed by TEM (53.51  4.2 nm). Comparing the performances of CoFe2O4@void@C and the bare CoFe2O4 in the CWPO of paracetamol, total organic carbon (TOC) removals of 58% and 46% are obtained respectively after 24 h of reaction. An empirical kinetic model based on second-order and autocatalytic expressions was developed to suitably describe the decomposition of H2O2 and the removal of paracetamol using CoFe2O4@void@C as catalyst. The disappearance of TOC was well-described (r2 = 0.98) by a lumped kinetic model as the sum of TOCA, TOCB and TOCC, where TOCA is the TOC of the PCM, TOCB refers the intermediate products and TOCC is the TOC of the final products obtained during the CWPO of PCM.</p>

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Nanoferrites for wastewater treatment

Jangra,

Edelman,

Ovchinnikov

et al. 2025

Nanoferrites for Emerging Environmental Applications

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Effect of heat-treatment temperature and zinc addition on magnetostructural and surface properties of manganese nanoferrite prepared by an ecofriendly sol–gel synthesis

Cited by 4 publications

References 35 publications

Thermal Decomposition Pathways of Zn_xFe_3–xO₄ Nanoparticles in Different Atmospheres

Thermal Decomposition Pathways of Zn_xFe_3–xO₄ Nanoparticles in Different Atmospheres

Magnetic CoFe2O4@carbon yolk-shell nanoparticles as catalysts for the catalytic wet peroxide oxidation of paracetamol: kinetic insights

Nanoferrites for wastewater treatment

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Effect of heat-treatment temperature and zinc addition on magnetostructural and surface properties of manganese nanoferrite prepared by an ecofriendly sol–gel synthesis

Cited by 4 publications

References 35 publications

Thermal Decomposition Pathways of ZnxFe3–xO4 Nanoparticles in Different Atmospheres

Thermal Decomposition Pathways of ZnxFe3–xO4 Nanoparticles in Different Atmospheres

Magnetic CoFe2O4@carbon yolk-shell nanoparticles as catalysts for the catalytic wet peroxide oxidation of paracetamol: kinetic insights

Nanoferrites for wastewater treatment

Contact Info

Product

Resources

About

Thermal Decomposition Pathways of Zn_xFe_3–xO₄ Nanoparticles in Different Atmospheres

Thermal Decomposition Pathways of Zn_xFe_3–xO₄ Nanoparticles in Different Atmospheres