Bentonite Clay
Mostrando 25-36 de 55 artigos, teses e dissertações.
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25. Characterization of Brazilian Bentonite Organoclays as sorbents of petroleum-derived fuels
This work focused on preparing and characterizing Brazilian bentonite clay through the use of quaternary ammonium salt so as to apply it as a sorbent for petroleum-derived fuels. Bentonite clay was organophilizated by the intercalation of quaternary ammonium salts such as cetyl-pyridinium chloride and benzalkonium chloride. The resulting materials were chara
Materials Research. Publicado em: 24/02/2012
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26. Utilização de mistura de solo saprolítico com bentonita na construção de revestimento de fundo de aterros sanitários. / Use of saprolite soil mixture with bentonite in the construction of landfill liner.
No Estado de São Paulo, a CETESB (1993), a exemplo da maioria das legislações e regulamentações ambientais em todo o mundo, recomenda que o coeficiente de permeabilidade da camada de impermeabilização de fundo de solo compactado (CCL ou compacted clay liner) em aterros sanitários seja menor ou igual a 10\ POT.-9\ m/s. O material mais utilizado para e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/12/2011
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27. ARGILAS ESMECTITAS MODIFICADAS COM COBALTO COLOIDAL UTILIZADAS COMO CATALISADORES NA DESTILAÇÃO CATALÍTICA DE GLICEROL / SMECTITES CLAYS MODIFIED WITH COLLOIDAL COBALT USED AS CATALYSTS IN CATALYTIC DISTILLATION OF GLYCEROL
Neste trabalho foram utilizados quatro argilas esmectitas (Sódica Importada, Chocolate, Brasgel e Verde Lodo) modificadas com cobalto coloidal [CoO(OH)], gerando materiais mistos nanoestruturados, denominados de SICo, ChCo, BrCo e VLCo. Os materiais de partida e mistos tiveram sua composição química determinada por espectrometria de energia dispersiva (E
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/08/2011
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28. Contribuição ao estudo das bentonitas do município de Boa Vista Estado da Paraíba. / Contribution to the study of bentonite in Boa Vista state of Paraíba.
The clays are composed of clay minerals and accessory minerals, whose crystal structure allows the adsorption of cations giving them particular physical and chemical properties. Chemically, the argilomineriais are formed mainly of hydrated silicates of aluminum, iron and magnesium. The bentonites are special types of industrial clays because submitting more
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/05/2011
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29. Sunflower oil bleaching by adsorption onto acid-activated bentonite
Two bentonite clays with different mineralogical compositions from Mendoza, Argentine, were activated with H2SO4 solutions of 4 and 8 N at 90ºC for 3.5 hours. This treatment affected clay structural properties, as was shown by thermogravimetry, infrared spectrometry and chemical analysis. Bleaching efficiency for sunflower oil was strongly dependent on the
Brazilian Journal of Chemical Engineering. Publicado em: 2011-03
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30. Nanocompósitos de borracha nitrílica com argilas montmoriloníticas e bentonitas / nonoonono
The search for new materials has been a constant in the humanity history. However, there are no plans to replace elastomers, even in long term, due to their unique mechanical properties. Among the various types of elastomers used nowadays, Nitrile Butadiene Rubber - NBR is a choice when one wants a material with good mechanical properties and excellent resis
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/03/2010
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31. Caracterização e propriedades do material coloidal nanoestruturado β-FeOOH/bentonita
A new mixed material was obtained through the combination of the suspensions of iron oxy-hydroxide and bentonite clay, denoted BFe. Analysis of its structure (XRD, Mossbauer and TGA) and composition (AAS) suggests the maintenance of the layer structure of the clay and an increase in the thermal stability of the BFe. Electrochemical studies performed in diffe
Química Nova. Publicado em: 2009
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32. Argilas bentoníticas da península de Santa Elena, Equador: pilarização, ativação ácida e seu uso como descolorante de óleo de soja
Two samples of calcic bentonite of the Santa Elena Peninsula, Ecuador, were pillared with Al13 ions in the ratio of 10, 15 and 20 meq of Al g-1 of clay, calcinated at 573, 723 and 873 ºK and acid activated with 4, 6 and 8 mol L-1 H2SO4. Analyses by X-ray diffraction, X-ray fluorescence, differential and gravimetric thermal, density, surface area and porosit
Química Nova. Publicado em: 2009
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33. Study of the potencial of national and argentinean bentonites to obtasin organophilic bentonites in aqueous dispersion and semi-solid medium to be applied in polymer nanocomposite / Estudo do potencial de bentonitas nacionais e argentinas na obtenção de bentonitas organofilicas em dispersão aquosa e meio semi-solido visando a aplicação em nanocompositos polimericos
Seven bentonites were evaluated to verify the potential to obtain the organophilic clay. The characterization by X-ray diffraction to evaluate the basal spacings was made, as well as the characterization by swelling capacity test, in water and in xylene, to evaluate the hydrophilic and organophobic character, by X-ray dispersive energy to indentify the prese
Publicado em: 2009
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34. Estudo da fotooxidação de nanocomposito PP/bentonita / Study on the photo-degradation of PP/Bentonite nanocomposites
The cation exchange of the bentonite and its processing are important factors to the polimeric nanocomposite formulation. The objective of this work was to produce nanocomposites of polypropylene / sodium bentonite and polypropylene / organophilic bentonite through melt intercalation and analyze the degradation produced by ultraviolet irradiation. Cetyl trim
Publicado em: 2008
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35. Estudo para a reutilização do resíduo sólido constituído pelas areias de fundição aglomeradas com argila, através da técnica de solidificação/estabilização em matrizes de cimento Portland, para aplicação no setor da construção civil / Study to reuse a solid waste generated by foundry sands bonded with clay, through solidification/stabilization in Portland cement matrices technic, for implementation in the construction industry
In this research, a study that investigates the technical feasibility for the recycling of solid waste generated by the disposal of the foundry sands bonded with clay, for implementation in the construction industry, was conducted. For this reason, the work establishes a method, which assesses the stabilization of waste in solidified matrices of Portland cem
Publicado em: 2008
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36. Estudo das interações do herbicida glifosato com argila natural brasileira monoionica / Interactions study of gliphosate herbicide with Brazilian natural monoionic clay
This research studies the glyphosate adsorptions in monoionic montimorilonite clay with Na, Cu, Ca, Al e Zn. The clay used is bentonite type. It comes of Boa Vista region in Campina Grande in the Brazilian state of Paraiba. It has been characterized by X-Ray, Scanning Electron Microscopy (SEM), Infra-Red Spectroscopy (IR), Chemical Analysis, ionic change cap
Publicado em: 2008