Freundlich Isotherms
Mostrando 13-24 de 91 artigos, teses e dissertações.
-
13. Parametric study of sweetening process of sour gas by Molybdenum oxide nanoparticles
Abstract The purpose of this work is to study the application of nano-molybdenum oxide adsorbent in gas sweetening process. Experiments were made to evaluate the operating and geometrical parameters in the adsorption process. The process performance of H2S removal from methane gas on molybdenum oxide nanoparticles was defined as the ratio of final concentrat
Braz. J. Chem. Eng.. Publicado em: 2017-10
-
14. Physical and chemical study of lattice kaolinites and their interaction with orthophosphate
ABSTRACT This study covers the evaluation of the structure and the capacity in adsorbing orthophosphate ions of kaolinites collected from sampling sites in Manaus (Brazil). The kaolinites were obtained using physical fractioning (sieving/siphoning) techniques and chemical treatment with HCl, H2SO4, H2O2 and KCl. The investigation of the kaolinite lattices in
An. Acad. Bras. Ciênc.. Publicado em: 2017-09
-
15. Preparation and Physicochemical, Structural and Morphological Characterization of Phosphorylated Starch
Phosphorylation of starch has resulted in appreciated material properties for applications in drug matrices. This study aimed to obtain and characterize samples of phosphorylated starch with sodium trimetaphosphate (STMP) and sodium tripolyphosphate (STPP). SEM micrographs allowed evidence that in relation to the starch in natura, the samples showed a loss o
Mat. Res.. Publicado em: 26/06/2017
-
16. Use of Brazilian Kaolin as a Potential Low-cost Adsorbent for the Removal of Malachite Green from Colored Effluents
This study investigated the potential of Brazilian kaolin as a low-cost adsorbent for the removal of Malachite Green (MG) from colored effluents. The morphology, chemical structure and surface properties of the adsorbent were investigated by characterization techniques such as X-ray diffraction, N2 adsorption-desorption isotherms, Fourier transform infrared
Mat. Res.. Publicado em: 11/05/2017
-
17. Thermogravimetric and spectroscopic study (TG–DTA/FT–IR) of activated carbon from the renewable biomass source babassu
Activated carbons (ACs) with well–developed microstructure and high microporosity were obtained from biomass by potassium hydroxide activation. The preparation process consisted in producing carbon materials in the ratios of activating agent to raw material 70:30, 50:50, 30:70 and 25:75 (w/w) characterized by thermal analysis coupled to spectroscopy (TG–
Quím. Nova. Publicado em: 2017-04
-
18. Sorption of Sulfachloropyridazine in Brazilian Soils
Sulfonamides are among the most widely employed antibacterial in veterinary medicine. Because a substantial proportion of sulfonamides are excreted unchanged as parent compounds after administration or are excreted as their metabolites through urine and feces, their presence in soils is a matter of concern. Adsorption and desorption are important processes t
J. Braz. Chem. Soc.. Publicado em: 2017-01
-
19. Natural Palygorskite as an Industrial Dye Remover in Single and Binary Systems
Layered or fibrous clay minerals are used as adsorbents because they have good performance to remove inorganic and organic species. In this work, a Brazilian fibrous clay mineral was applied to remove Remazol Yellow GR industrial dye from simple and binary systems; this was performed in the presence of lead in the latter case. The adsorption efficiency was i
Mat. Res.. Publicado em: 10/10/2016
-
20. STUDY OF BINARY AND SINGLE BIOSORPTION BY THE FLOATING AQUATIC MACROPHYTE Salvinia natans
Abstract The performance of Salvinia natans macrophyte to recover lead and chromium from single and bicomponent solutions in batch and fixed bed systems was investigated. Equilibrium data were obtained through isotherms and fitted to Langmuir, Freundlich and D-R models for a single component system. In the fixed bed study the breakthrough curves were carried
Braz. J. Chem. Eng.. Publicado em: 2016-09
-
21. AN EXPERIMENTAL STUDY OF H2 AND CO2 ADSORPTION BEHAVIOR OF C-MOF-5 AND T-MOF-5: A COMPLEMENTARY STUDY
Abstract In this paper the cubic and tetragonal structure of MOF-5 were successfully synthesized and characterized by TGA and SEM analysis. Equilibrium adsorption isotherms of C-MOF-5 and T-MOF-5 for H2 and CO2 were measured up to 25 bar at 298 K using a volumetric method. The C-MOF-5 adsorbent synthesized in this study had a 0.107 and 79.9 wt% adsorption ca
Braz. J. Chem. Eng.. Publicado em: 2016-03
-
22. Characterization of Pequi (Caryocar brasiliense) Shells and Evaluation of Their Potential for the Adsorption of PbIIIons in Aqueous Systems
In this study pequi (Caryocar brasiliense) shells were evaluated in relation to their potential for the adsorption of PbII ions in aqueous systems. The adsorbent was characterized by point of zero charge (PZC), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) and PbII ions were detected
J. Braz. Chem. Soc.. Publicado em: 2016-03
-
23. Polyphenolic resin synthesis: optimizing plantain peel biomass as heavy metal adsorbent
AbstractPolyphenolic resol resins were obtained from an ethanolic extraction of green plantain peels (Musa paradisiaca) grown in Colombia. A synthesis was then performed by polycondensation in an alkaline pH solution in order to perform research on phenolic resin production with high mechanical performance. The polymers were characterized by DSC and TGA anal
Polímeros. Publicado em: 2015-08
-
24. Adsorption of 1-(2-thiazolylazo)-2-naphthol on amberlite XAD-7 and silica gel: isotherms and kinetic studies
O reagente 1-(2-tiazolilazo)-2-naftol (TAN) tem sido extensamente usado em extração em fase sólida (EFS) sem avaliação crítica do processo de adsorção. Neste trabalho, a adsorção de TAN em XAD-7 e sílica-gel foi investigada e os dados experimentais foram ajustados aos modelos de Langmuir, Freundlich e Dubinin-Radushkevich. Estes modelos forneceram
J. Braz. Chem. Soc.. Publicado em: 2014-04