Exchange Ionic
Mostrando 13-24 de 191 artigos, teses e dissertações.
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13. Ab. initio study of the structural, elastic, electronic and optical properties of Cu3N
Electronic, optical, elastic, properties of Copper nitride (Cu3N) in cubic anti- ReO3 phase have been studied using the full-potential augmented plane waves (FP-LAPW) within density functional theory (DFT) framework. Generalized gradient approximation (GGA), local density approximation (LDA), Perdew - Burke - Ernzerhof generalized parameterization of gradien
Mat. Res.. Publicado em: 01/04/2014
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14. Sulfonation and characterization of styrene-indene copolymers for the development of proton conducting polymer membranes
The aim of this work is to obtain polymer precursors based on styrene copolymers with distinct degrees of sulfonation, as an alternative material for fuel cell membranes. Acetyl sulfate was used to carry out the sulfonation and the performance of the polyelectrolyte was evaluated based on the content of acid polar groups incorporated into the macromolecular
Polímeros. Publicado em: 30/10/2012
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15. Desenvolvimento de um adsorvente contínuo supermacroporoso de troca catiônica para recuperação de lactoferrina de soro de leite / Development of a cation exchange solid supermacroporous adsorbent for lactoferrin recovery from whey
Whey proteins have functional, nutritional and technological properties promoting their use as ingredients and supplements. Sweet whey obtained from Minas Frescal cheese production and concentrated by ultrafiltration was used in the lactoferrin capture in a supermacroporous adsorbent. Supermacroporous monolithic columns have been prepared by radical cryo-cop
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/11/2011
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16. Modificação de poli(fluoreto de vinilideno) induzida por radiação gama para aplicação como compósito ionomérico de metal-polímero / Poly(vinylidene fluoride) modification induced by gamma irradiation for application as ionic polymer-metal composite
Gamma-radiation-induced grafting of styrene into poly(vinylidene fluoride) (PVDF) films with 0.125 mm thickness at doses from 1 to 100 kGy in the presence of a styrene/N,N- dimethylformamide (DMF) solution (1:1, v/v) and styrene/toluene (1:1, v/v) at dose rate of 5 kGy h-1 was carried out by simultaneous method under nitrogen atmosphere at room temperature,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/07/2011
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17. Catalisadores heterogêneos para a produção de monoésteres graxos (biodiesel)
The recent increase in the world biodiesel demand, along with the need to reduce costs while improving the environmental sustainability of the entire biodiesel production chain, have led to the search for heterogeneous catalysts that would be efficient and highly amenable to recycling. Many classes of materials have been tested for these purposes. Among thes
Química Nova. Publicado em: 2011
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18. Adsorção de arsênio(V) pelo compósito magnético hidrotalcita: óxido de ferro
In this work, hydrotalcite, a layered double hydroxide, had its adsorption and ion exchange properties combined with the magnetic properties of iron oxide to produce a magnetic adsorbent, HT-Fe. The removal of As(V) by a HT-Fe adsorbent was evaluated under various conditions. The Kinetic process was well described by a pseudo-second order rate model. The max
Química Nova. Publicado em: 2011
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19. DETERMINAÇÃO DAS CONSTANTES DE ESTABILIDADE DOS COMPLEXOS FORMADOS ENTRE OS AMINOÁCIDOS CISTEÍNA, N-ACETILCISTEÍNA E LISINA COM CHUMBO EM SOLUÇÃO AQUOSA / DETERMINATION OF STABILITY CONSTANTS FOR LEAD COMPLEXES WITH CYSTEINE, N-ACETYLCYSTEINE AND LYSINE IN AQUEOUS SOLUTIONS
In this study we investigated the interaction between lead and the amino acid cysteine, lysine and N-acetylcysteine by testing long-term contact with ion exchanger resins and also the determination of stability constants. The importance of investigating the presence of lead in solutions for parenteral nutrition is related to the risk of internal contaminatio
Publicado em: 2011
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20. Recuperação de urânio de rejeito de mina por meio de lixiviação alcalina / Recovery of uranium from mine wastes by alkaline leaching
Appropriate management of wastes is one of the most important environmental problems, particularly concerning the tailings of mining activities. Interim storage of the tailings at incorrect places pending treatment demands an urgent solution. The Osamu Utsumi Mine located in the city of Caldas, Minas Gerais, has faced such problem. The waste of the mine cons
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/04/2010
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21. AlteraÃÃes fisiolÃgicas induzidas por estresses abiÃticos em plantas jovens de pinhÃo-manso / PHYSIOLOGICAL CHANGES INDUCED BY ABIOTIC STRESSES IN PHYSIC NUT YOUNG PLANTS
In this work were studied diverse physiological mechanisms, as the osmotic adjustment, photosynthesis, including gas exchange and chlorophyll fluorescence parameters, as well the oxidative responses in physic nuts submitted to different abiotic stresses as: salinity, drought and high temperature. The first experiment aimed to study the effects of increase of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/10/2009
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22. Estudo de equilÃbrio de troca iÃnica de sistemas binÃrios e ternÃrios por meio de redes neurais / Ion exchange equilibrium of the binary and ternary systems using neural network and mass action law
In the majority of the applications of the process of ionic exchange in the chemical industry some ionic species are gifts that compete between itself for the active small sieges of the ionic exchanger. Therefore, the project of these systems requires an analysis of the coefficients of selectivity of ions gifts in the solution that determines the influence o
Publicado em: 2009
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23. Equilibrium study of binaries and ternary ion exchange systems envolving copper, cadmium and calcium ions by alginate biopolymer / Estudo do equilibrio dos sistemas binarios e ternario de troca ionica dos ions cobre, cadmio e calcio pelo biopolimero alginato
In this work, it was studied the ion exchange process involving copper, cadmium and calcium ions. The heavy metals, copper and cadmium, were evaluated due to its high toxicity, its presence in industrial effluent and difficulty in its removal when in low concentrations, however, above permitted levels by law. Alginate was used as ionic exchanger. In the pres
Publicado em: 2009
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24. Propiedades de adsorción en zeolitas con anillos de 8 miembros: I. microporosidad y superficie externa
In this work synthesis of LTA zeolite and its ionic exchange with inorganic chemical salts were studied. Likewise experimental results are reported about LTA zeolite external surface area by using the t-plot method. Physicochemical characterization of this zeolite was carried out by XRD, SEM, IR and nitrogen adsorption (76 K) techniques. LTA zeolite was synt
Matéria (Rio de Janeiro). Publicado em: 2009