Constant Of Freundlich
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. Background concentrations and adsorption of selenium in tropical soils / Valores de referência e adsorção de selênio em solos tropicais
O selênio (Se) é um elemento traço essencial a nutrição animal. Por outro lado, o limiar de concentração entre suficiente e tóxico é estreito. A presença de Se nos alimentos está relacionada à sua concentração no solo. Deste modo, conhecer a quantidade e o comportamento do Se no solo é muito importante para um correto manejo ambiental, previni
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/06/2012
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2. Biossorventes â biomassa de aguapà e esferas de alginato/goma do cajueiro â para adsorÃÃo de azul de metileno. / BIOSORBENTS - WATER HYACINTH BIOMASS AND SPHERES ALGINATE / CASHEW GUM - FOR ADSORPTION OF METHYLENE BLUE
In this work was carried out an extensive investigation of the adsorption properties of synthetic dyes on different parts (rhizome, root, stolon and petiole) of Eichhornia crassipes (water hyacinth) and a comparison with the adsorption capacity of the biopolymer alginate beads doped with water hyacinth biomass. The biomasses and spheres were structurally cha
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/02/2012
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3. Cu(II) adsorption on modified bentonitic clays: different isotherm behaviors in static and dynamic systems
Cu (II) removal equilibrium from aqueous solutions using calcined clays "Bofe" and "Verde-lodo" has been studied by batch and fixed-bed in static and dynamic systems, respectively. Analyses were performed for physicochemical characterization of clays using the techniques: X-ray fluorescence (XRF), thermogravimetry (TG), N2 adsorption (BET) and Cationic Excha
Materials Research. Publicado em: 29/11/2011
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4. Adsorption of di-2-pyridylketone salicyloylhydrazone (DPKSH) on resin IRA 402: use in spectrophotometric determination of Cu(II) ions by FIA after separation and pre-concentration in solid phase / Adsorção da di-2-piridil cetona saliciloilhidrazona (DPKSH) em resina ira 402: aplicação na determinação espectrofotométrica de íons Cu(ii) por análise por injeção em fluxo (FIA) após separação e pré-concentração em fase sólida
Pre-concentration in solid phase provides advantages such as simplicity, automation easiness, improvement in detection limits, possibilities to combine it with Flow Injection Analysis (FIA), integration of reaction and retention phases, lower consumption of reagents and increase in selectivity. This process requires the development and characterization of ne
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/09/2009
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5. Adsorption of nuclease p1 on chitosan nano-particles
The sorption of nuclease P1 onto chitosan nano-particles is studied in this paper. The effect of some adsorption kinetics factors such as nuclease P1 concentration, chitosan nano-particles solution concentration, adsorption temperature, chitosan nano-particles size, solution pH, etc. is investigated. Adsorption of nuclease P1 onto chitosan nano-particles is
Brazilian Journal of Chemical Engineering. Publicado em: 2009-06
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6. Estudo da adsorção de brometo de etídeo em resina XAD-7
The adsorption of ethidium bromide on XAD-7 resin was studied. The Freundlich model was the most representative isotherm model to describe the sorption behavior. A solid-liquid equilibrium model was proposed to explain the resin mass influence on the sorption. The equilibrium constant value estimated was 2.31. The results showed an ethidium bromide ion-pair
Química Nova. Publicado em: 2009
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7. BORON REMOVAL FROM OIL PRODUCTION WASTEWATER AND EFFLUENTS BY ADSORPTION / REMOÇÃO DE BORO DE ÁGUAS E EFLUENTES DE PETRÓLEO POR ADSORÇÃO
The presence of boron in waters has increased continually and in parallel to the industrial development. And also, the harmful effects to the organisms and living creatures has increased as well, especially on plants, where the gap between the deficiency and the toxicity is very short. In the present work it was investigated the effects of different operatin
Publicado em: 2009
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8. CASCA DE ARROZ COMO ADSORVENTE PARA ÍONS DE METAIS PESADOS: Caracterização e modificação química / RICE HUSK AS ADSORBENTS FOR HEAVY METAL IONS: characterization and chemical modification
Adsorption of some metal ions (Co2+, Ni2+, Cu2+ e Zn2+) from aqueous solutions (pH 5.0) onto in nature rice husk (0.088 < <0.177 mm) was investigated. All experiments were conducted by the batch adsorption techniques at room temperature (28 1C) and under constant stirring. The adsorption amounts were determined using atomic absorption spectr
Publicado em: 2009
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9. Aplicação de Zr/Ti-PILC no processo de adsorção de Cu(II), Co(II) e Ni(II) utilizando modelos físico-químicos de adsorção e termodinâmica do processo
The aim of this investigation is to study how Zr/Ti-PILC adsorbs metals. The physico-chemical proprieties of Zr/Ti-PILC have been optimized with pillarization processes and Cu(II), Ni(II) and Co(II) adsorption from aqueous solution has been carried out, with maximum adsorption values of 8.85, 8.30 and 7.78 x10-1 mmol g-1, respectively. The Langmuir, Freundli
Química Nova. Publicado em: 2008
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10. SorÃÃo do inseticida tiametoxam em solos sob efeito de fosfato e vinhaÃa / Sorption of the insecticide thiamethoxam in soils under the effect of both phosphate and vinasse.
There is little information available in the literature on the behavior of thiamethoxam in soils in Brazil. On the other hand, there are many studies focusing on the effects of phosphate and vinasse amendments in those soils. The objectives of this study were to evaluate the sorption and desorption of thiamethoxam in samples of both A and B horizons of dystr
Publicado em: 2007
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11. Studies about the adsorption of di-2-pyridyl ketone salicyloylhydrazone (DPKSH) on Amberlite XAD-2 and XAD-7 resins. Extraction of ion Cu(II) using the solid phase XAD-7 modified with DPKSH / Estudos de adsorção de di-2-piridil cetona saliciloilhidrazona (DPKSH) em resinas amberlite xad-2 e xad-7. Extração de íons cobre em fase sólida envolvendo a xad-7 modificada com DPKSH
Di-2-pyridyl ketone salicyloylhydrazone (DPKSH) is a hydrazone which forms coordination compounds with several metallic ions. Amberlite XAD-2 and XAD-7 resins are non-ionic polymers which can be used to pre-concentrate metallic ions. Adsorption of DPKSH onto these polymeric matrices was investigated using the spectrophotometry. The amount of DPKSH adsorbed o
Publicado em: 2007
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12. AvaliaÃÃo do potencial de biossorÃÃo dos Ãons Cd (II), Cu (II) e Zn (II) pela macrÃfita Egeria densa / Biosorption potential study for Cd (II), Cu (II) and Zn (II) by aquatic macrophytes Egeria densa
In the present work has been studied the metallic ion removal from aqueous solutions using the non-living aquatic macrophytes Egeria densa as biosorbent in order to assess its potential on cadmium, cuprum and zinc ions adsorption experiments. For this purpose, several adsorption tests were performed by duplicate in order to determine the optimal experimental
Publicado em: 2007