A novel synthesis route to obtain magnetic nanocrystalline cobalt ferrite with photo-Fenton activity

Souza, Bruna Gonçalves de; Figueira, Gustavo; Carvalho, Maria Helena Catelli de; Alcaraz-González, V.; Saldaña-Flores, Karla E.; Godinho, Mário; Oliveira, A. J. A. de; Kiminami, R. H. G. A.; Ruotolo, Luís A.M.; Urquieta‐González, Ernesto A.

doi:10.1016/j.matchemphys.2020.123741

Cited by 15 publications

(4 citation statements)

References 21 publications

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“…It was reported that when CoFe 2 O 4 nanoparticles were prepared by the precipitation method combined with microwave-assisted hydrothermal treatment, part of Co 2+ migrated from octahedral sites to tetrahedral sites after microwave hydrothermal treatment, resulting in an increase in Fe 3+ concentration at octahedral sites, and CoFe 2 O 4 exhibited better Fenton catalytic activity. 42 In addition, oxygen vacancy defects may appear during the conversion process, which would also promote the catalytic reaction.…”

Section: Crystal Structurementioning

confidence: 99%

Review on cobalt ferrite as photo-Fenton catalysts for degradation of organic wastewater

Wang

You

et al. 2023

Catal. Sci. Technol.

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Section: Crystal Structurementioning

confidence: 99%

Review on cobalt ferrite as photo-Fenton catalysts for degradation of organic wastewater

Wang

You

et al. 2023

Catal. Sci. Technol.

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“…Melanoidin was synthesized [26] using glycine (99%), D-(+)-Glucose (99.5%) and bicarbonate of sodium (Sigma™). The degradation of lignin was carried out using H 2 O 2 (50%) (Fermont™) and a zinc ferrite catalyst, which was provided by the Federal University of São Carlos [27,28]. The degradation of Gallic acid and melanoidin was carried out using H 2 O 2 (50%) (Fermont™) and, respectively, an iron or a zirconium catalyst [29,30].…”

Section: Reagentsmentioning

confidence: 99%

Regulation of Hydrogen Peroxide Dosage in a Heterogeneous Photo-Fenton Process

et al. 2021

Self Cite

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In this work, a classical linear control approach for the peroxide (H2O2) dosage in a photo-Fenton process is presented as a suitable solution for improving the efficiency in the treatment of recalcitrant organic compounds that cannot be degraded by classical wastewater treatment processes like anaerobic digestion. Experiments were carried out to degrade Lignin, Melanoidin, and Gallic acid, which are typical recalcitrant organic compounds present in some kinds of effluents such as vinasses from the Tequila and Cachaça industries. Experiments were carried in Open-Loop mode for obtaining the degradation model for the three compounds in the form of a Transfer Function, and in Closed-Loop mode for controlling the concentration of each compound. First-order Transfer Functions were obtained using the reaction curve method, and then, based on these models, the parameters of Proportional Integral controllers were calculated using the direct synthesis method. In the Closed-Loop experiments, the Total Organic Carbon removal was 39% for lignin, 7% for melanoidin, and 29% for Gallic acid, which were greater than those obtained in the Open-Loop experiments.

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“…Cobalt ferrite has also been used as a solid catalyst for ozonation reactions [16,20]. Because it is a low-bandgap semiconductor (approximately 1.08 eV) and is highly stable as a photocatalyst [21,22], CoFe 2 O 4 can also be a more advantageous alternative to TiO 2 and other photoactive materials, such as the perovskite structure (ABO 3 ), in photocatalytic processes [23][24][25][26].…”

Section: Introductionmentioning

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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A novel synthesis route to obtain magnetic nanocrystalline cobalt ferrite with photo-Fenton activity

Cited by 15 publications

References 21 publications

Review on cobalt ferrite as photo-Fenton catalysts for degradation of organic wastewater

Review on cobalt ferrite as photo-Fenton catalysts for degradation of organic wastewater

Regulation of Hydrogen Peroxide Dosage in a Heterogeneous Photo-Fenton Process

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

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