Auto-combustion synthesis, Mössbauer study and catalytic properties of copper-manganese ferrites

Velinov, Nikolay; Petrova, Tanya; Tsoncheva, Tanya; Genova, Izabela; Koleva, K.; Kovacheva, D.; Mitov, Ivan

doi:10.1007/s10751-016-1222-8

Cited by 15 publications

(6 citation statements)

References 21 publications

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“…Most particles had octahedral morphology (Figure 2a-c). Compared with other synthesis approaches (e.g., solvothermal, Sun et al [21]; sol-gel autocombustion, Velinov et al [16]; and co-precipitation followed by annealing treatment, Yang et al [25]); our Cu0.5Mn0.5Fe2O4 had much higher crystalline morphology. Noticeably in both SEM and magnified TEM images, small particles were well-distributed among larger particles, which further confirmed the impeccable melamine-assisted calcination, allowing rapid electron transfer and efficient photocatalytic activity (Figure 2a-c).…”

Section: Materials Characterizationmentioning

confidence: 66%

“…In addition, these materials are not only biocompatible but also provide excellent intrinsic magnetism, which facilitates recovery and material reusability from the treated water. Although several researchers have proposed various approaches for synthesizing the MnFe 2 O 4 nanoparticles using co-precipitation or sol-gel methods, these methods also produce a hematite (α-Fe 2 O 3 ) impurity that reduces the catalyst magnetic properties [15,16]. By using another method such as hydrothermal synthesis [4,17], the obtained bare MnFe 2 O 4 particles, in turn, possessed too high a level of magneticity that facilitates agglomeration, which reduces the active surface area.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Photo-Fenton Activity Using Magnetic Cu0.5Mn0.5Fe2O4 Nanoparticles as a Recoverable Catalyst for Degrading Organic Contaminants

Angkaew

Sakulthaew

Nimtim

et al. 2022

Water

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Interest in using various nanoparticle catalysts to activate H2O2 with light for organic contaminant and wastewater treatment is steadily increasing. We successfully synthesized magnetically recoverable Cu0.5Mn0.5Fe2O4 nanoparticles using a simple co-precipitation method followed by melamine-assisted calcination. Material characterization revealed that melamine acted as a coordinating agent during the calcination process that promoted a ferrite structure. Copper (Cu)-substitution effectively decreased material aggregation and promoted catalytic activities. Cu0.5Mn0.5Fe2O4 nanoparticles showed outstanding catalytic performance on several organic contaminants (87.6–100.0% removal within 2 h). Using oxytetracycline (OTC) as a surrogate wastewater constituent, we found that the hydroxyl radical (•OH) and superoxide anions (•O2−) were the active radical species involved in OTC degradation. Cu0.5Mn0.5Fe2O4 nanoparticles exhibited excellent photo-Fenton catalytic ability in real wastewater and demonstrated high material stability, even after four consecutive uses (i.e., fourth cycle). In a pilot-scale experiment (10 L), we provide proof that our rigorous treatment system was able to remove remnant OTC, TOC, and also any available colloidal particles to only 1 NTU. Ecotoxicity studies using an aquatic plant (Hydrilla verticillata) and zooplankton revealed that treated water could be reused in various ratios. Furthermore, at 5% of treated water, rapid leaf recovery and a significant increase in rotifer numbers were reported. These observations support the use of Cu0.5Mn0.5Fe2O4/H2O2/light as an efficient and environmentally friendly catalytic system for treatment of organic contaminants, and a radical generating mechanism is proposed.

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Section: Materials Characterizationmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Enhanced Photo-Fenton Activity Using Magnetic Cu0.5Mn0.5Fe2O4 Nanoparticles as a Recoverable Catalyst for Degrading Organic Contaminants

Angkaew

Sakulthaew

Nimtim

et al. 2022

Water

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“…The calculated Mössbauer parameters are summarized in Table 5. The parameters of the three sextets correspond to the three iron positions in Hägg carbide, χ-Fe 5 C 2 [38,39].…”

Section: Resultsmentioning

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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“…Ferrite-based nanomaterials (consist of iron oxide) as an important type of functional particles have been studied due to their excellent poetries including large surface area, high surface to volume ratio, strong adsorption capacity, facile recovery, etc. ( Casbeer, Sharma, & Li, 2012 ; Polshettiwar et al, 2011 ; Velinov et al, 2016 ).…”

Section: Metal-based Nanoparticlesmentioning

confidence: 99%

Role of different types of nanomaterials against diagnosis, prevention and therapy of COVID-19

Ghaemi

Amiri

Bajuri

et al. 2021

Sustainable Cities and Society

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Auto-combustion synthesis, Mössbauer study and catalytic properties of copper-manganese ferrites

Cited by 15 publications

References 21 publications

Enhanced Photo-Fenton Activity Using Magnetic Cu0.5Mn0.5Fe2O4 Nanoparticles as a Recoverable Catalyst for Degrading Organic Contaminants

Enhanced Photo-Fenton Activity Using Magnetic Cu0.5Mn0.5Fe2O4 Nanoparticles as a Recoverable Catalyst for Degrading Organic Contaminants

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

Role of different types of nanomaterials against diagnosis, prevention and therapy of COVID-19

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