Amphiphilic magnetic composites based on layered vermiculite and fibrous chrysotile with carbon nanostructures: Application in catalysis

Teixeira, Ana Paula C.; Purceno, Aluir D.; Barros, Aline S.; Lemos, Bruno Rocha Santos; Ardisson, José D.; Macedo, W. A. A.; Nassor, Evelisy C. O.; Amorim, Camila C.; Moura, Flávia C.C.; Hernández-Terrones, Manuel Gonzalo; Portela, Flaysner Magayver; Lago, Rochel M.

doi:10.1016/j.cattod.2012.01.042

Cited by 33 publications

(21 citation statements)

References 37 publications

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“…[45][46][47][48] These amphiphilic materials are composed of a ceramic matrix (providing the hydrophilic surface) containing carbon nanostructures (responsible for the hydrophobic properties) and magnetic iron cores coated with carbon to produce the magnetic properties of the composite (Figure 14).…”

Section: Amphiphilic Synthesismentioning

confidence: 99%

“…The lamellar clay mineral was first fragmented to form microsheet fragments. The microsheets were then impregnated with iron nitrate and subjected to a CVD process to grow the carbon nanostructures 46,47,53,54 (Figure 15). …”

Section: Iron: a Versatile Element To Produce Materials For Environmementioning

confidence: 99%

“…46 For example, in the transesterification reaction to produce biodiesel, oils do not mix with the alkali/ methanol phase and a vigorous stirring to promote a good interface is necessary for the reaction to take place. 59 When the amphiphilic composites were added to these biphasic systems, an emulsion was formed and due to the excellent interface, an efficient transesterification took place.…”

Section: Emsulsifier and Demulfiermentioning

confidence: 99%

“…59 When the amphiphilic composites were added to these biphasic systems, an emulsion was formed and due to the excellent interface, an efficient transesterification took place. 46 After transesterification, the biodiesel is emulsified with a more polar phase reaction formed by water, glycerol and the excess methanol. Due to the magnetic properties of the amphiphilic composites, they can be dragged towards an external applied magnetic field.…”

Section: Emsulsifier and Demulfiermentioning

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: Amphiphilic Synthesismentioning

confidence: 99%

Section: Iron: a Versatile Element To Produce Materials For Environmementioning

confidence: 99%

Section: Emsulsifier and Demulfiermentioning

confidence: 99%

Section: Emsulsifier and Demulfiermentioning

confidence: 99%

See 2 more Smart Citations

Iron: a versatile element to produce materials for environmental applications

Teixeira¹,

Tristão²,

Araújo³

et al. 2012

J. Braz. Chem. Soc.

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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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The Meeting Point of Carbonaceous Materials and Clays: Toward a New Generation of Functional Composites

Darder

Aranda

Ruiz-García

et al. 2017

Adv Funct Materials

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Carbon and clays are worldwide-spread natural resources known and used for centuries by humans. In spite of their differences, both have been combined to produce diverse types of functional materials, from conventional pencil cores to advanced hybrid composites. The presence of highly conductive graphene and/or carbon nanotubes allows for their use in applications ranging from elements of electrochemical devices to additives for polymer nanocomposites, pollution adsorbents, or active catalysts. Both top-down and bottom-up strategies can be applied to conveniently assemble carbon and clay counterparts. Moreover, such synthetic strategies can be tailored to produce adequate nanostructured materials and/or associate other species. This critical review presents the latest advances on this topic, addressing aspects related to the possibility to produce hybrid materials based on their functionalization capacity.

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Amphiphilic magnetic composites based on layered vermiculite and fibrous chrysotile with carbon nanostructures: Application in catalysis

Cited by 33 publications

References 37 publications

Iron: a versatile element to produce materials for environmental applications

Iron: a versatile element to produce materials for environmental applications

Magnetic Amphiphilic Composites Applied for the Treatment of Biodiesel Wastewaters

The Meeting Point of Carbonaceous Materials and Clays: Toward a New Generation of Functional Composites

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