Bentonite
Mostrando 25-36 de 129 artigos, teses e dissertações.
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25. Gas permeability of bentonite barriers: development, construction and testing of a measurement system
Abstract This article proposes a testing device to quickly and reliably estimate the gas permeability of bentonite-based clay barriers used in landfill cover systems. The testing methodology is based on a transient gas flow regime that passes through the barrier, therefore not requiring the use of sophisticated equipment that aim to maintain constant differe
REM, Int. Eng. J.. Publicado em: 2016-12
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26. Binder Behavior on Chromite-Carbon Composite Pellets
The influence of binders on the mechanical properties of chromite, self-reducing pellets, after subjecting to high temperatures, is analyzed in this paper. Bentonite, sodium silicate, and a combination of bentonite with carboxymethyl cellulose (CMC) were tested with different contents. All of the raw materials were characterized by chemical analysis and part
Mat. Res.. Publicado em: 29/09/2016
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27. Hybrid Materials Based on Bentonite Functionalized with Amine Groups via the Hydrolytic Sol-Gel Method
Bentonite is a natural clay that presents characteristics such as good capacity to exchange cations, large specific surface area, large porosity, and possibility to undergo intercalation and/or functionalization. This work reports on bentonite functionalization with organomodified alkoxides. Functionalization afforded hybrid materials displaying desirable pr
J. Braz. Chem. Soc.. Publicado em: 2016-05
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28. Effect of litter treatment on growth performance, intestinal development, and selected cecum microbiota in broiler chickens
ABSTRACT The objective of this study was to determine whether the type of bedding materials (sand, wood shavings, and paper) and of two chemical amendments (lime and bentonite) could interfere with litter quality (moisture, pH, and total bacterial counts), thereby influencing also the growth performance and the development of intestinal traits and cecum micr
R. Bras. Zootec.. Publicado em: 2016-05
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29. 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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30. Effects of Yeast Glucomannan and Sodium Bentonite on the Toxicity of Aflatoxin in Broilers
ABSTRACT The aim of this study was to evaluate the efficacy of a yeast glucomannan (YG) and sodium bentonite (SB) in reducing the toxicity of aflatoxin for broilers fed a diet naturally contaminated with aflatoxin. In total, 300 7-day-old Ross 308 broilers were randomly assigned to 10 dietary treatments, consisting of a diet with no aflatoxin (positive contr
Rev. Bras. Cienc. Avic.. Publicado em: 2015-12
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31. 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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32. 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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33. 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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34. 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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35. 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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36. 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