Bentonite Clay
Mostrando 13-24 de 55 artigos, teses e dissertações.
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13. Hydrolytic and Thermal Degradation of PCL and PCL/Bentonite Compounds
Poly(Ɛ-caprolactone)/montmorillonite (PCL/MMT) and Poly(Ɛ-caprolactone)/organo-modified montmorillonite (PCL/OMMT) compounds at 3% w/w clay content were prepared by melting mixing. The effect of MMT and OMMT on the degradability of PCL injected specimens was investigated in vacuum at 40oC for up to 45 days and in aqueous medium at 40oC for up to 45 days. S
Mat. Res.. Publicado em: 08/04/2016
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14. Synthesis of polycationic bentonite-ionene complexes and their benzene adsorption capacity
The purpose of this work was to structurally modify clays in order to incorporate water-insoluble molecules, such as petroleum hydrocarbons. The potential for ion exchange of quaternary ammonium salts was studied, which revealed their ability to interact with anions on the cationic surface, for environmental applications of the material. Ionenes, also known
Polímeros. Publicado em: 2015-04
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15. Insight of the removal of nickel and copper ions in fixed bed through acid activation and treatment with sodium of clay
The bentonitic clays show good adsorptive characteristics, being used as alternative material for removing metals. This study evaluates several treatments (calcination, acid activation and treatment with sodium) of bentonite type Bofe in the removal of nickel and copper. Analyses were performed for physicochemical characterization of clay using the technique
Braz. J. Chem. Eng.. Publicado em: 2014-12
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16. Characterization of the complex metal-clay obtained in the process of lead adsorption
This study aims to characterize the complex metal-clay formed by adsorption of lead. In this work, the bentonite clay named Fluidgel was calcined at 750 ºC and was used as adsorbent for lead removal. The characterization of this clay and complex metal-clay was carried out by X-ray diffraction (XRD), Fourier transformer infrared spectroscopy (FTIR), surface
Mat. Res.. Publicado em: 11/03/2014
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17. Removal of Cadmium(II) and Lead(II) ions from aqueous phase on sodic bentonite
This paper describes the adsorption of Cd2+and Pb2+ions using sodic bentonite clay type Fluidgel modified. The Fluidgelbefore and after chemical modification and thermal activation was characterized by different techniques including X-ray diffraction, thermal analysis, Fourier transform infrared, surface area, helium pycnometry, cation exchange capacity and
Mat. Res.. Publicado em: 28/01/2013
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18. 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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19. Removal of lead and cadmium ions in different adsorption systems / ion exchange in bentonite clay type Fluidgel / Remoção de íons de chumbo e cádmio em diferentes sistemas de adsorção/troca iônica em argila bentonítica tipo Fluidgel
Neste trabalho foi avaliada a capacidade de remoção de metais pesados comumente encontrados em efluentes e aterros sanitários da região metropolitana de Campinas, mais especificamente o chumbo e o cádmio, utilizando argila bentonítica sódica tipo Fluidgel extraída de jazias do nordeste brasileiro (Boa Vista - PB). A argila Fluidgel foi fornecida na f
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/08/2012
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20. Adsorção de o-xileno em argila fluidgel organofílica em fase gasosa / Adsorption of o-xylene onto organoclay fluidgel in gas phase
The industrial growth allied to use of petroleum products generate numerous volatile organic compounds (VOC) that are continuously emitted to the atmosphere, degrading air quality and causing serious problems to human health and environment. Among the VOC, the so-called BTEX (benzene, toluene, ethyl benzene, and xylene), are the most important in terms of to
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/07/2012
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21. Influência da argila na invasão de fluidos de perfuração em reservatórios de petróleo / Clay influence on drilling fluids invasion in petroleum reservoir
A perfuração de poços de petróleo pode danificar fortemente a formação, incluindo a região de interesse: o reservatório. Perfurar sem que se danifique o reservatório caracteriza-se como um grande desafio, e por isso, tem sido estimulado o desenvolvimento de tecnologias de fluidos e otimização de processos de perfuração, incluindo, por exemplo, o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/02/2012
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22. A kinetic and equilibrium study of zinc removal by Brazilian bentonite clay
This paper aimed to study the removal of zinc using bentonite clay from the Northeastern Brazil, as an adsorbent. A study of the clay subjected to thermal and chemical treatment was performed in order to evaluate the optimization of the adsorption capacity of this material. For the evaluation of the kinetic equilibrium of the process, experimental tests were
Mat. Res.. Publicado em: 02/11/2012
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23. Influence of thermal treatment on bentonite used as adsorbent for Cd, Pb, Zn retention from mono-solute and poly-solute aqueous solutions
The retentions of Zn, Cd and Pb cations by one treated bentonite up to 750 °C were analyzed. The retentions were evaluated by using mono-and poly-solute aqueous solutions of such cations. The adsorptions were carried out in batch system at room temperature. The solid/liquid ratio was 2% wt.v-1. The solids were characterized by X-ray diffraction, thermal and
Materials Research. Publicado em: 10/07/2012
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24. Evaluation of impact strength of polyamide 6/bentonite clay nanocomposites
Nanocomposites of polymer/clay have had much attention in recent years, particularly those developed with layered silicates due to the need of engineering materials more efficient than pure polymers for certain applications. The level of exfoliation of layered silicates in crystalline structure of polymer matrices has been studied and has been observed that
Materials Research. Publicado em: 26/06/2012