Cation occupancy sites in synthetic Co-doped magnetites as determined with X-ray absorption (XAS) and Mössbauer spectroscopies

Lelis, M.F.F.; Porto, A.O.; Gonçalves, C.M.; Fabris, José Domingos

doi:10.1016/j.jmmm.2003.12.1313

Cited by 66 publications

(36 citation statements)

References 14 publications

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“…Moreover, magnetites are magnetic materials and can be easily separated from the reaction medium by a simple magnetic separation procedure. In a preliminary work [19] it has been observed that, in fact, M 2+ species in the magnetite structure play an important role in the Fenton chemistry.…”

Section: Introductionmentioning

confidence: 99%

Novel active heterogeneous Fenton system based on Fe3−xMxO4 (Fe, Co, Mn, Ni): The role of M2+ species on the reactivity towards H2O2 reactions

Costa

Lelis

Oliveira

et al. 2006

Journal of Hazardous Materials

457

108

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Section: Introductionmentioning

confidence: 99%

Novel active heterogeneous Fenton system based on Fe3−xMxO4 (Fe, Co, Mn, Ni): The role of M2+ species on the reactivity towards H2O2 reactions

Costa

Lelis

Oliveira

et al. 2006

Journal of Hazardous Materials

457

108

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“…A identificação dos compostos foi realizada pelo tempo de retenção e pelos espectros de massas individuais, comparados com a biblioteca do equipamento e a literatura. 27 A metodologia utilizada para analisar as amostras foi retirada da USEPA, METHOD 8270D, 2007. ) são a concentração inicial e a concentração no tempo t da solução do benzo(a)pireno.…”

Section: Análise Por Cg/emunclassified

Oxidação do Benzo(a)pireno em Matrizes Aquosas por Magnetita Dopada com Cobalto Combinada com Peróxido de Hidrogênio

Biazati¹,

Moreira²,

Neto³

et al. 2017

Rev. Virtual Quim.

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Polycyclic aromatic hydrocarbons (PAHs), are substances of increasing concern to the environment due to their toxic, carcinogenic and mutagenic character. Major anthropogenic sources of PAHs include the incomplete combustion of organic materials (e.g. oil, petrol, coal, and wood). The concern about water contamination and the consequent human exposure has encouraged the development of new methods for PAHs removal. The purpose of this work was to study the feasibility of a degradation process of benzo(a)pyrene in aqueous matrices by oxidation with Fenton's reagent and utilization of pure and doped magnetites (with Co +2 ions replacing some of the Fe 2+ ions) and hydrogen peroxide. Under the best experimental conditions, a modified Fenton-type reaction was performed at near neutral pH (pH = 6.0); H2O2 dose = 0,3 mol.L -1 ; benzo(a)pyrene = 4.0 mg.L -1 and doped magnetites with Co +2 = 30,0 mg. The presence of Co +2 in the magnetite structure produced a remarkable increase in the degradation of benzo(a)pyrene. It was possible to remove about 53,0% of benzo(a)pyrene in 300 minutes of reaction at 25 o C. This study showed that the degradation of benzo(a)pyrene by magnetites doped with cobalt is a viable process in water matrices. It was observed that the substitution of some Fe 2+ ions with Co +2 ions in magnetite produced an increase in the activity of degradation of benzo(a)pyrene.

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“…Detailed characterization of the oxides has been published elsewhere [9,24]. The Co-doped magnetites were further characterized by Lelis et al with X-ray absorption spectroscopy [25]. Table 1 Magnetization, lattice parameters and chemical analyses for the magnetites doped with Co, Mn and Ni: …”

Section: Characterization Of the Catalystsmentioning

confidence: 99%

Novel solvent free liquid-phase oxidation of β-pinene over heterogeneous catalysts based on Fe3−xMxO4 (M=Co and Mn)

Menini

Silva

Lelis

et al. 2004

Applied Catalysis A: General

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Cation occupancy sites in synthetic Co-doped magnetites as determined with X-ray absorption (XAS) and Mössbauer spectroscopies

Cited by 66 publications

References 14 publications

Novel active heterogeneous Fenton system based on Fe3−xMxO4 (Fe, Co, Mn, Ni): The role of M2+ species on the reactivity towards H2O2 reactions

Novel active heterogeneous Fenton system based on Fe3−xMxO4 (Fe, Co, Mn, Ni): The role of M2+ species on the reactivity towards H2O2 reactions

Oxidação do Benzo(a)pireno em Matrizes Aquosas por Magnetita Dopada com Cobalto Combinada com Peróxido de Hidrogênio

Novel solvent free liquid-phase oxidation of β-pinene over heterogeneous catalysts based on Fe3−xMxO4 (M=Co and Mn)

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