Brazilian Limonite for the Oxidation of Quinoline: High Activity after a Simple Magnetic Separation

Souza, Wladmir F.; Guimarães, Iara do Rosário; Lima, Diana Quintão; Silva, Carmen L. T.; Oliveira, Luiz C.A.

doi:10.1021/ef900480x

Cited by 13 publications

(3 citation statements)

References 14 publications

(13 reference statements)

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“…Magnetite (Fe 3 O 4 ) (Gao et al, 2007;Xu and Wang, 2012a;Xue et al, 2009aXue et al, , 2009bZhang et al, 2009), goethite (α-FeOOH) (Lin and Gurol, 1996;Lu et al, 2002;Ortiz de la Plata et al, 2010), green rust (GR(Cl (Hanna et al, 2010), ferrous hydroxide colloids (Yan et al, 2012), pyrite (FeS 2 ) (Matta et al, 2007;Zhang et al, 2014), FeS , limonite (Souza et al, 2009), nanostructured δ-FeOOH (Pinto et al, 2012). Fe 3 O 4 /humic acid (Fe 3 O 4 /HA) (Niu et al, 2011), prussian blue modified γ-Fe 2 O 3 (PBMNPs) (Wang and Huang, 2011;Zhang et al, 2010) (Costa et al, 2008), FeO x H 2x-3 /Fe 0 , iron oxide/Fe 0 (Nie et al, 2008(Nie et al, , 2010.…”

Section: Iron Minerals and Iron (Hydr)oxidementioning

confidence: 99%

“…Other iron minerals and iron (hydr)oxides including naturally existing pyrite (Matta et al, 2007), green rust (Hanna et al, 2010), limonite (Souza et al, 2009) and synthesized ferrous hydroxide colloids (Yan et al, 2012), nano δ-FeOOH (Pinto et al, 2012), Fe 3 O 4 / HA (Niu et al, 2011), PBMNPs (Wang and Huang, 2011;Zhang et al, 2010), Fe 0 /iron oxide (Costa et al, 2008;Nie et al, 2008Nie et al, , 2010, etc., are effective heterogeneous Fenton catalysts. Due to the low iron leaching and the limited reactivity of the reaction filtrate, most of the reaction systems follow the heterogeneous catalysis mechanism.…”

Section: Other Iron Minerals and Iron (Hydr)oxidesmentioning

confidence: 99%

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Interfacial mechanisms of heterogeneous Fenton reactions catalyzed by iron-based materials: A review

Yang

Men

et al. 2016

Journal of Environmental Sciences

450

153

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The heterogeneous Fenton reaction can generate highly reactive hydroxyl radicals (UOH) from reactions between recyclable solid catalysts and H 2 O 2 at acidic or even circumneutral pH. Hence, it can effectively oxidize refractory organics in water or soils and has become a promising environmentally friendly treatment technology. Due to the complex reaction system, the mechanism behind heterogeneous Fenton reactions remains unresolved but fascinating, and is crucial for understanding Fenton chemistry and the development and

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Section: Iron Minerals and Iron (Hydr)oxidementioning

confidence: 99%

Section: Other Iron Minerals and Iron (Hydr)oxidesmentioning

confidence: 99%

Interfacial mechanisms of heterogeneous Fenton reactions catalyzed by iron-based materials: A review

Yang

Men

et al. 2016

Journal of Environmental Sciences

450

153

View full text Add to dashboard Cite

show abstract

“…Hematite thus plays a negligible role in this Fenton-like reaction. Souza et al (2009) studied the possibility of using natural ''limonite'' as a low-cost catalyst in a Fenton-like system for quinoline oxidation. This natural Fe oxide mixture (basically goethite and maghemite) was modified by simple magnetic separation.…”

Section: Geomaterialsmentioning

confidence: 99%

Iron oxide catalysts: Fenton and Fentonlike reactions – a review

2012

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Iron is the fourth most common element by mass in the Earth's crust and forms compounds in several oxidation states. Iron (hydr)oxides, some of which form inherently and exclusively in the nanometre-size range, are ubiquitous in nature and readily synthesized. These facts add up to render many Fe (hydr)oxides suitable as catalysts, and it is hardly surprising that numerous studies on the applications of Fe (hydr)oxides in catalysis have been published. Moreover, the abundant availability of a natural Fe source from rocks and soils at minimal cost makes the potential use of these as heterogeneous catalyst attractive.Besides those Fe (hydr)oxides that are inherently nanocrystalline (ferrihydrite, Fe5HO8.4H2O, and feroxyhyte, δ’-FeOOH), magnetite (Fe3O4) is often used as a catalyst because it has a permanent magnetization and contains Fe in both the divalent and trivalent states. Hematite, goethite and lepidocrocite have also been used as catalysts in their pure forms, doped with other cations, and as composites with carbon, alumina and zeolites among others.In this review we report on the use of synthetic and natural Fe (hydr)oxides as catalysts in environmental remediation procedures using an advanced oxidation process, more specifically the Fenton-like system, which is highly efficient in generating reactive species such as hydroxyl radicals, even at room temperature and under atmospheric pressure. The catalytic efficiency of Fe (hydr)oxides is strongly affected by factors such as the Fe oxidation state, surface area, isomorphic substitution of Fe by other cations, pH and temperature.

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Boosting the catalytic activity of natural magnetite for wet peroxide oxidation

Muñoz

Mondejar

Pedro

et al. 2018

Environ Sci Pollut Res

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This work explores the modification of naturally occurring magnetite by controlled oxidation (200-400 °C, air atmosphere) and reduction (300-600 °C, H atmosphere) treatments with the aim of boosting its activity in CWPO. The resulting materials were fully characterized by XRD, XPS, TGA, TPR, SEM, and magnetization measurements, allowing to confirm the development of core-shell type structures. The magnetite core of the solid remained unchanged upon the treatment whereas the Fe(II)/Fe(III) ratio of the shell was modified (e.g. 0.42, 0.11 and 0.63 values were calculated for pristine FeO, FeO-O400, and FeO-R400, respectively). The performance of the catalysts was tested in the CWPO of sulfamethoxazole (SMX) (5 mg L) under ambient conditions and circumneutral pH (pH = 5), using the stoichiometric dose of HO (25 mg L) and a catalyst load of 1 g L. The key role of the ferrous species on the mineral shell was evidenced. Whereas the oxidation of magnetite led to significantly slower degradation rates of the pollutant, its reduction gave rise to a dramatic increase, achieving the complete removal of SMX in 1.5 h reaction time with the optimum catalyst (FeO-R400) compared to the 3.5 h required with the pristine mineral. A reaction mechanism was proposed for SMX degradation, and a kinetic equation based on the Eley-Rideal model was accordingly developed. This model successfully fitted the experimental results. The stability of FeO-R400 was evaluated upon five sequential runs. Finally, the versatility of the catalytic system was proved in real environmentally relevant water matrices.

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Brazilian Limonite for the Oxidation of Quinoline: High Activity after a Simple Magnetic Separation

Cited by 13 publications

References 14 publications

Interfacial mechanisms of heterogeneous Fenton reactions catalyzed by iron-based materials: A review

Interfacial mechanisms of heterogeneous Fenton reactions catalyzed by iron-based materials: A review

Iron oxide catalysts: Fenton and Fentonlike reactions – a review

Boosting the catalytic activity of natural magnetite for wet peroxide oxidation

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