Activated Clay
Mostrando 1-12 de 32 artigos, teses e dissertações.
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1. Brazilian Mineral Clays: Classification, Acid Activation and Application as Catalysts for Methyl Esterification Reactions
In this study, three raw Brazilian clays from João Pessoa, Paraíba State (Aço AP, AVL and Verde Lodo) were characterized before and after purification and acid activation. Several instrumental techniques were used, and the raw clays were classified as dioctahedral smectites with different compositions, where the AVL sample had the highest content of montm
J. Braz. Chem. Soc.. Publicado em: 2021-01
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2. Optimization of sunflower oil bleaching parameters: using Response Surface Methodology (RSM)
Abstract Bleaching is an important part of the oil refining process, in which pigments, impurities, traces of metals, and oxidative-molecular components of oils are removed. In this regard, the optimization of bleaching conditions can be effective to increase oil quality. In this study, de-gummed and neutralized sunflower oil was bleached at 80, 90, 100, 110
Food Sci. Technol. Publicado em: 2020-06
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3. Optimization of sunflower oil bleaching parameters: using Response Surface Methodology (RSM)
Abstract Bleaching is an important part of the oil refining process, in which pigments, impurities, traces of metals, and oxidative-molecular components of oils are removed. In this regard, the optimization of bleaching conditions can be effective to increase oil quality. In this study, de-gummed and neutralized sunflower oil was bleached at 80, 90, 100, 110
Food Sci. Technol. Publicado em: 30/09/2019
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4. The increase of surface area of a Brazilian palygorskite clay activated with sulfuric acid solutions using a factorial design
Palygorskite is fibrous clay in which the structural tetrahedral and octahedral layers are organized in a way that structural channels are formed, leading to high surface area. However, impurities inside the channels and aggregated ones considerably reduce the available area. In order to increase the surface area, an activation treatment can be considered us
Mat. Res.. Publicado em: 21/05/2013
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5. Characterization of Unye bentonite after treatment with sulfuric acid
Unye bentonite was found to consist predominantly of a dioctahedral smectite along with quartz, tridymite, cristobalite, and minor fractions of feldspar and anatase. A considerable amount of Al was retained as a constituent in acid-resistant impurities following the decomposition of the montmorillonite via acid treatment at an acid/clay ratio of 0.4. These i
Quím. Nova. Publicado em: 2013
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6. 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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7. Modificação da argila montmorilonita e do carvão de coco de babaçu ativado com óxido de ferro: caracterização e aplicação na adsorção do azul de metileno / Modification of montmorillonite clay and babassu coconut activated carbon with iron oxide: characterization and application in the adsorption of methylene blue dye
A argila montmorilonita e o carvão de coco de babaçu ativado foram modificados, caracterizados e aplicados no estudo de adsorção do corante azul de metileno. Na modificação o método da precipitação ex-situ foi utilizado. Os dois adsorventes modificados apresentaram características magnéticas e podem ser utilizados na separação magnética. As an�
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/02/2010
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8. Caracterização de catalisadores usados na oleoquímica
In order to improve the physical-chemical properties of bio oil from castor oil were used as catalysts silica and alumina, both pure and doped. The study showed that products from the catalytic cracking of castor oil have properties more satisfactory, especially when using alumina. This fact can be explained by higher acidity, mesoporous characteristic and s
Publicado em: 2010
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9. Remoção de alquilbenzeno linear sulfonado (LAS) e caracterização microbiana em reator anaeróbio de leito fluidificado / Removal of linear alkylbenzene sulfonate (LAS) and microbial characterization in anaerobic fluidized bed reactor
Nesse trabalho foi estudado a degradação anaeróbia do alquilbenzeno linear sulfonado (LAS), um surfactante amplamente utilizado na fabricação de detergentes e presente em esgoto doméstico e águas residuárias industriais. Para isso foi utilizado reator anaeróbio de leito fluidificado em escala de bancada (1,2 L) preenchido com material suporte para i
Publicado em: 2010
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10. 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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11. Argilominerais puro e quimicamente modificados como adsorventes para corantes catiônicos / Natural and chemically ativated clays as adsorbent for cationic dyes.
The interactions between lamellar silicate with dyes have been widely studied for analytical applications that are intended as and electrochemical adsorption. In this work, sodium vermiculite (Vs) and vermiculites exchanged with copper (V/Cu) and cobalt (V/Co) and through controlled leaching (Vac1 and Vac3) were synthesized. The vermiculite reacted with nitr
Publicado em: 2009
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12. CARACTERIZAÇÃO TECNOLÓGICA DAS ARGILAS DA PENÍNSULA DE SANTA ELENA, EQUADOR: VIABILIDADE DE SUAS UTILIZAÇÕES INDUSTRIAIS
Clays of the Santa Elena Peninsula located to the southwest of the coast of Ecuador have been studied in order to identify its main physical, chemical and mineralogical characteristics, as well as the main mineral contained in these clays. One hundred eighty eight points were searched and forty and two samples were collected, being representative of the six
Publicado em: 2008