Influence of Ce-Mn co-doping on the structure and magnetic properties of cobalt ferrites

Qin, Xiufang; Zhang, Ting; Wang, Jinzeng; Zhao, Rui; Ma, Yuanli; Wang, Fang; Xu, Xin

doi:10.1016/j.jallcom.2022.167256

Cited by 17 publications

(5 citation statements)

References 42 publications

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“…Thus, the cation distribution plays a significant role in determining the magnetic properties of this type of material. Finally, the wide characteristic hysteresis loops of the CoFe2O4 indicate a hard magnetic character [49]. A sample prepared using Φ = 0.8 was analyzed by SEM.…”

Section: Characterization Of Cofe 2 O 4 Nanoparticlesmentioning

confidence: 99%

Cobalt Ferrite (CoFe2O4) Spinel as a New Efficient Magnetic Heterogeneous Fenton-like Catalyst for Wastewater Treatment

Cechinel,

Nicolini,

Tápia

et al. 2023

Sustainability

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For the first time, cobalt ferrite spinel (CoFe2O4) was used as a catalyst in the Fenton process for Remazol Red RR dye degradation in water. CoFe2O4 was synthesized via gel combustion using tris(hydroxymethyl)aminomethane as an alternative fuel in one step with a ratio of Ψ = 0.8. Its structural, surface optics, magnetic properties, and the optimal conditions of the Fenton reagents for dye degradation were evaluated. The saturation magnetization and remanence (Ms and Mr, respectively) for the as-prepared powder were 65.7 emu/g and 30.4 emu/g, respectively, and the coercivity (Hc) was 1243 Oe, indicating its ferromagnetic nature and suitability as a magnetic catalyst. Red Remazol RR dye degradation tests were performed using the Fenton process to evaluate the influence of the catalyst dosage and H2O2 concentration. The tests were performed in a batch reactor in the dark with constant agitation for 24 h. The best result was obtained using 1 g/L of catalyst with a dye degradation of 80.6%. The optimal concentration of H2O2 (1.0 M) resulted in 96.5% dye degradation. Nanoparticle recyclability testing indicated that the material could be satisfactorily reused as a catalyst for at least three cycles. The potential use of the CoFe2O4 synthesized in this study as a catalyst for dye degradation by the Fenton process was demonstrated.

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Section: Characterization Of Cofe 2 O 4 Nanoparticlesmentioning

confidence: 99%

Cobalt Ferrite (CoFe2O4) Spinel as a New Efficient Magnetic Heterogeneous Fenton-like Catalyst for Wastewater Treatment

Cechinel,

Nicolini,

Tápia

et al. 2023

Sustainability

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“…Numerous studies of spinel ferrites have been motivated by the interest to investigate the relationship between their composition, structure, and functional properties as magnetic, optical, catalytic, etc. [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Nanocrystalline (Cu0.5Ni0.5)yFe3−yO4 Ferrites: Synthesis and Characterization

Velinov,

Petrova,

Karashanova

et al. 2024

Crystals

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Nanocrystalline materials with the composition of (Cu0.5Ni0.5)yFe3−yO4 and a spinel structure were synthesized by the auto-combustion sol–gel method. The materials were characterized by powder X-ray diffraction, Mössbauer spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and N2 physisorption. A decrease in the unit cell parameter and increase in the crystallite size with a decrease in the copper and nickel content in ferrites were evidenced. Mössbauer analysis determined that iron ions are in the 3+ states in all compositions. Transmission electron microscopy showed that synthesized ferrite materials consisted of nanoparticles with narrow size distributions. The catalytic properties of synthesized ferrites were studied in the reaction of ethyl acetate oxidation and methanol decomposition. The conversion of ethyl acetate and CO2 selectivity increased with temperature, and this effect was most pronounced for (Cu0.5Ni0.5)0.5Fe2.5O4, for which the main part of the particles possessed sizes below 10 nm, and the mean diameter was calculated to be 4.3 nm. The catalytic activity in the reaction of methanol decomposition was the highest for (Cu0.5Ni0.5)0.25Fe2.75O4, and it decreased with the increase in Cu and Ni content in the samples. The analysis of the samples after the catalytic test indicated significant reduction transformations within the catalysts. Under the reaction medium, the spinel phase decomposed through the formation of Hägg carbide.

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“…23 It is found that the catalytic performance of Ce−Mn composite oxides was generally related to the valence state of Mn, Ce, and the distribution of oxygen species, which could be tuned by regulating the composition ratios or constructing a core−shell structure. 24,25 However, the synergistic effect of Ce−Mn on the catalytic activity and selectivity of the H 2 S-SCO reaction is yet to be revealed. As reported in our previous work, both MnO 2 and CeO 2 catalysts could be active for H 2 S-SCO.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In the light of the advantages of Ce–Mn composite oxides, their catalytic performance has been explored in various applications, such as high-temperature gasifier effluent desulfurization, adsorption of mercury, and catalytic reduction of NO with NH 3 . It is found that the catalytic performance of Ce–Mn composite oxides was generally related to the valence state of Mn, Ce, and the distribution of oxygen species, which could be tuned by regulating the composition ratios or constructing a core–shell structure. , However, the synergistic effect of Ce–Mn on the catalytic activity and selectivity of the H 2 S-SCO reaction is yet to be revealed. As reported in our previous work, both MnO 2 and CeO 2 catalysts could be active for H 2 S-SCO.…”

Section: Introductionmentioning

confidence: 99%

Ce–Mn Oxide Nanocomposites for Catalytic Removal of H₂S

Zhang

Zheng

Zhang

et al. 2023

ACS Appl. Nano Mater.

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The development of efficient and stable nanocatalysts is crucial for the catalytic removal of H 2 S through selective oxidation to sulfur. Inspired by the different catalytic activity and selectivity of CeO 2 and MnO 2 for the reaction, cerium−manganese (Ce−Mn) nanocomposite oxides with tunable phase structure and unique surface properties were constructed to optimize the catalytic performance. By regulating the molar ratio of Ce and Mn components, a novel catalyst structure comprising Ce−Mn solid solution and amorphous CeO 2 is synthesized from Ce−Mn oxide with n Ce /n Mn ratio of 0.5 (50Ce−Mn). Compared with the unmodified MnO 2 , the tailored 50Ce−Mn possesses a high specific surface area, which facilitates the access of reactants to active sites and the desorption of formed sulfur. More importantly, strong Ce−Mn interaction and abundant surface-active oxygen species are generated, contributing to the regeneration of Mn 4+ /Ce 4+ active sites, facilitating the formation of sulfur, and inhibiting the accumulation of sulfates during the reaction. Consequently, 50Ce−Mn presents a superior catalytic activity (T 100 of 150 °C), stability, and sulfur selectivity even under relatively high weight hourly space velocity conditions (23,000 mL•g −1 •h −1 ). This study provides an example of how catalytic performance can be boosted through phase structure regulation on nanocomposites.

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Influence of Ce-Mn co-doping on the structure and magnetic properties of cobalt ferrites

Cited by 17 publications

References 42 publications

Cobalt Ferrite (CoFe2O4) Spinel as a New Efficient Magnetic Heterogeneous Fenton-like Catalyst for Wastewater Treatment

Cobalt Ferrite (CoFe2O4) Spinel as a New Efficient Magnetic Heterogeneous Fenton-like Catalyst for Wastewater Treatment

Nanocrystalline (Cu0.5Ni0.5)yFe3−yO4 Ferrites: Synthesis and Characterization

Ce–Mn Oxide Nanocomposites for Catalytic Removal of H₂S

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Influence of Ce-Mn co-doping on the structure and magnetic properties of cobalt ferrites

Cited by 17 publications

References 42 publications

Cobalt Ferrite (CoFe2O4) Spinel as a New Efficient Magnetic Heterogeneous Fenton-like Catalyst for Wastewater Treatment

Cobalt Ferrite (CoFe2O4) Spinel as a New Efficient Magnetic Heterogeneous Fenton-like Catalyst for Wastewater Treatment

Nanocrystalline (Cu0.5Ni0.5)yFe3−yO4 Ferrites: Synthesis and Characterization

Ce–Mn Oxide Nanocomposites for Catalytic Removal of H2S

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Product

Resources

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Ce–Mn Oxide Nanocomposites for Catalytic Removal of H₂S