Production of nanostructured magnetic composites based on Fe0 nuclei coated with carbon nanofibers and nanotubes from red mud waste and ethanol

Oliveira, Aline Silva de; Tristão, Juliana Cristina; Ardisson, José D.; Dias, Anderson; Lago, Rochel M.

doi:10.1016/j.apcatb.2011.04.007

Cited by 41 publications

(21 citation statements)

References 31 publications

(30 reference statements)

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“…and naturally occurring iron oxides or even iron containing wastes (e.g., red mud and mining waste). 42 If ethanol is used as the reducing agent and carbon source, hematite is reduced to Fe metal and carbide and large amounts of carbon nanotubes (CNTs) are formed ( Figure 11). These magnetic coated particles were used as adsorbent of organic compounds, e.g., methylene blue and chlorobenzene, and for the production of a magnetic recyclable supported Pd catalyst, as hydrogenation reactions (Figure 12).…”

Section: Magnetic Nanostructured Composites Based On Carbon Coated Irmentioning

confidence: 99%

“…These magnetic coated particles were used as adsorbent of organic compounds, e.g., methylene blue and chlorobenzene, and for the production of a magnetic recyclable supported Pd catalyst, as hydrogenation reactions (Figure 12). [40][41][42][43] An innovative approach to produce magnetic nanoparticles based on iron cores encapsulated by a high surface area carbon was produced using Fe 3+ ions and sucrose as a carbon source and reducing agent. In this process, first Fe 3+ ions are solubilized in aqueous sucrose and upon thermal decomposition the iron is reduced to form magnetic particles surrounded by a nanometric layer of more organized graphitic carbon entrapped in an amorphous carbonaceous matrix ( Figure 13).…”

Section: Magnetic Nanostructured Composites Based On Carbon Coated Irmentioning

confidence: 99%

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Iron: a versatile element to produce materials for environmental applications

Teixeira¹,

Tristão²,

Araújo³

et al. 2012

J. Braz. Chem. Soc.

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Ferro é um elemento versátil que forma várias fases com diferentes estados de oxidação e estruturas, tais como Fe 0 , FeO, Fe 3 O 4 , γ-Fe 2 O 3 , α-Fe 2 O 3 e FeOOH. Todas estas fases têm propriedades físico-químicas únicas que podem ser usadas para diferentes aplicações. Neste trabalho, descreve-se o uso de diferentes compostos de ferro, sintéticos e também naturais ou de rejeitos, em aplicações ambientais e tecnológicas. Duas áreas principais de pesquisa são descritas. A primeira é relacionada às estratégias para aumentar a reatividade de fases de ferro pela formação de compósitos Fe 0 /Fe óxido e pela introdução de novos metais na estrutura de óxidos de ferro para promover novas reações superficiais. A segunda área de pesquisa é o uso das propriedades magnéticas de algumas fases de ferro para produzir materiais magnéticos versáteis com aplicações focadas em adsorção, catálise e emulsões.Iron is a versatile element forming several phases with different oxidation states and structures, such as Fe 0 , FeO, Fe 3 O 4 , γ-Fe 2 O 3 , α-Fe 2 O 3 and FeOOH. All these phases have unique physicochemical properties which can be used for different applications. In this work, it is described the use of different iron compounds, synthetic and also from natural and waste sources, in environmental and technological applications. Two main research areas are described. The first one is related to strategies to increase the reactivity of Fe phases, mainly by the formation of Fe 0 /iron oxide composites and by the introduction of new metals in the iron oxide structure to promote new surface reactions. The second area is the use of the magnetic properties of some iron phases to produce versatile magnetic materials with focus in adsorption, catalysis and emulsions.

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Section: Magnetic Nanostructured Composites Based On Carbon Coated Irmentioning

confidence: 99%

Section: Magnetic Nanostructured Composites Based On Carbon Coated Irmentioning

confidence: 99%

Iron: a versatile element to produce materials for environmental applications

Teixeira¹,

Tristão²,

Araújo³

et al. 2012

J. Braz. Chem. Soc.

Self Cite

View full text Add to dashboard Cite

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“…The thermal decomposition of ethanol occurs typically above 650°C but iron nuclei reduce this temperature, since they act in the dehydrogenation of ethanol and in the nucleation and growth of carbon nanostructures (Oliveira et al 2011;Pinilla et al 2011).…”

Section: Modifications On Mcm-41mentioning

confidence: 99%

Synthesis and characterization of catalysts based on mesoporous silica partially hydrophobized for technological applications

Martins

Salviano

Oliveira

et al. 2016

Environ Sci Pollut Res

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In this work, mesoporous silica mobil composition of matter no. 41 (MCM-41) was synthesized by the sol-gel method. Two different surface modifications were made to transform this material into a very active adsorbent and catalyst support: (i) impregnation of iron nanoparticles and (ii) hydrophobization via chemical vapor deposition (CVD) with ethanol. The materials prepared with different iron contents, i.e., 2.5, 5, and 10 %, after hydrophobization, were characterized by several techniques. CHN analysis and Raman spectroscopy proved that approximately 15 % of carbon is deposited during CVD process mainly as organized carbonaceous structures. The specific surface area was determined by the BET method as up to 1080 m g, which explains the excellent results of the materials in the adsorption of model dyes methylene blue and indigo carmine. Mössbauer spectroscopy, thermogravimetric (TG)/DTG analysis, and transmission electron microscopy (TEM) images showed that the iron supported may be partially reduced during the CVD process to Fe species, which are stabilized by the carbon coating. This iron species plays an important role in the oxidation of different contaminants, such as quinoline and methylene blue. The results obtained in the catalytic tests showed to be very promising.

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“…We have recently reported a new amphiphilic magnetic nanostructured composite, based on carbon nanotubes and nanofibers supported on hydrophilic materials, e.g., Al and Si oxides, containing carbon coated magnetic Fe particles [8][9][10][11][12][13]. These composites showed remarkable capacity to break emulsions under magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Amphiphilic Composites Applied for the Treatment of Biodiesel Wastewaters

et al. 2012

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In this work, new magnetic amphiphilic composites were prepared by chemical vapor deposition with ethanol on the surface of hydrophilic natural chrysotile matrix containing Fe catalyst. XRD, Raman, Mössbauer and SEM analyses suggest the formation of a complex nanostructured material composed of hydrophobic carbon nanotubes/nanofibers grown on the hydrophilic surface of the MgSi fiber mineral and the presence of Fe metallic nanoparticles coated by carbon. These nanostructured particles show amphiphilic properties and interact very well with both oil and aqueous phases. When added to emulsions the amphiphilic particles locate on the oil/water interface and, under a magnetic field, the oil droplets collapsed leading to the separation of the aqueous and oil phases. Preliminary work showed excellent results on the use of these particles to break wastewater emulsions in the biodiesel process.

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Production of nanostructured magnetic composites based on Fe0 nuclei coated with carbon nanofibers and nanotubes from red mud waste and ethanol

Cited by 41 publications

References 31 publications

Iron: a versatile element to produce materials for environmental applications

Iron: a versatile element to produce materials for environmental applications

Synthesis and characterization of catalysts based on mesoporous silica partially hydrophobized for technological applications

Magnetic Amphiphilic Composites Applied for the Treatment of Biodiesel Wastewaters

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