Composites prepared from natural iron oxides and sucrose: A highly reactive system for the oxidation of organic contaminants in water

Pereira, Márcio C.; Cavalcante, Luís Carlos Duarte; Magalhães, Fabiano; Fabris, José Domingos; Stucki, Joseph W.; Oliveira, Luiz C.A.; Murad, E.

doi:10.1016/j.cej.2010.11.083

Cited by 26 publications

(11 citation statements)

References 38 publications

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“…Bearing this in mind, future attempts to improve CWPO-based water treatment technologies may comprise very distinct approaches, such as the proper tuning of the carbon materials, as widely discussed in Section 3, the incorporation of metals with increased performances, as a result of the several studies that have been performed on the subject [144], or the very recent advances on the synthesis of hybrid magnetic carbon materials for other applications [209,210,215]. In addition, carbon-based hybrid magnetic composites produced from very distinct waste materials such as sewage sludge [56,216], soil [217],…”

Section: Summary and Perspectivesmentioning

confidence: 99%

Catalytic wet peroxide oxidation: a route towards the application of hybrid magnetic carbon nanocomposites for the degradation of organic pollutants. A review

Ribeiro

Silva

Figueiredo

et al. 2016

Applied Catalysis B: Environmental

156

102

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Several motivations have prompted the scientific community towards the application of hybrid magnetic carbon nanocomposites in catalytic wet peroxide oxidation (CWPO) processes. The most relevant literature on this topic is reviewed, with a special focus on the synergies that can arise from the combination of highly active and magnetically separable iron species with the easily tuned properties of carbon-based materials. These are mainly ascribed to increased adsorptive interactions, to good structural stability and low leaching levels of the metal species, and to increased regeneration and dispersion of the active sites, which are promoted by the presence of the carbon-based materials in the composites.The most significant features of carbon materials that may be further explored in the design of improved hybrid magnetic catalysts are also addressed, taking into consideration the experimental knowledge gathered by the authors in their studies and development of carbonbased catalysts for CWPO. The presence of stable metal impurities, basic active sites and sulphur-containing functionalities, as well as high specific surface area, adequate porous texture, adsorptive interactions and structural defects, are shown to increase the activity of carbon materials when applied in CWPO, while the presence of acidic oxygen-containing functionalities has the opposite effect.

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Section: Summary and Perspectivesmentioning

confidence: 99%

Catalytic wet peroxide oxidation: a route towards the application of hybrid magnetic carbon nanocomposites for the degradation of organic pollutants. A review

Ribeiro

Silva

Figueiredo

et al. 2016

Applied Catalysis B: Environmental

156

102

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“…Both magnetite (grey subspectra) and wüstite (cross-hatched subspectra) contribute to the catalytic efficiency of the composite, whereas hematite and a minor amount of paramagnetic Fe 3+ are more or less passive (cf. Pereira et al, 2011b). After five reaction cycles the composite had lost its catalytic activity and was regenerated by heating in air for 30 min.…”

Section: Iron Oxide Catalystsmentioning

confidence: 99%

“…This material proved to be an efficient heterogeneous Fenton-like catalyst for the oxidation of quinoline in aqueous media. Pereira et al (2011b) reported the use of a Brazilian soil containing 81% Fe 2 O 3 to produce composites with charcoal from sucrose to activate H 2 O 2 for the oxidation of contaminants in water. The thermo-chemical treatment was able to convert hematite from the soil into magnetite, and thus a catalytically active species (because of the presence of structural Fe 2+ ).…”

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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“…Nesse processo, resíduo é gerado e sua composição química e mineralógica terá características do resíduo incinerado. Ainda, a ocorrência da Hematita pode estar associada à inicial presença de Goethita, uma vez que esta é mais estável em temperaturas ambientes e, em temperaturas superiores a 200ºC, sofre desidroxilação, originando, então, a Hematita após o processo de incineração (PEREIRA et al, 2011). Outro mineral identificado foi a Jarosita, um sulfato hidratado de ferro e potássio originado da oxidação de sulfetos de ferro.…”

Section: Resultsunclassified

Caracterização de resíduo gerado por processo de lavagem de gases e avaliação de possíveis aplicações em construção civil

Bragagnolo¹,

Korf²,

Muscope³

et al. 2018

RDAE

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Composites prepared from natural iron oxides and sucrose: A highly reactive system for the oxidation of organic contaminants in water

Cited by 26 publications

References 38 publications

Catalytic wet peroxide oxidation: a route towards the application of hybrid magnetic carbon nanocomposites for the degradation of organic pollutants. A review

Catalytic wet peroxide oxidation: a route towards the application of hybrid magnetic carbon nanocomposites for the degradation of organic pollutants. A review

Iron oxide catalysts: Fenton and Fentonlike reactions – a review

Caracterização de resíduo gerado por processo de lavagem de gases e avaliação de possíveis aplicações em construção civil

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