Freundlich Isotherms
Mostrando 25-36 de 91 artigos, teses e dissertações.
-
25. Biosorption study of Ni2+ and Cr3+ by Sargassum filipendula: kinetics and equilibrium
In this work, the biosorption of Cr3+ and Ni2+ by Sargassum filipendula pre-treated with CaCl2 was studied. Kinetic and equilibrium experiments were carried out for mono- and multi-component solutions in a batch reactor at pH 3.0 and 30 ºC. The results from the kinetic experiments showed that Cr3+ adsorbs slower than Ni2+. This behavior was explained by mea
Braz. J. Chem. Eng.. Publicado em: 2014-03
-
26. ModificaÃÃo QuÃmica da Casca do Coco Bruto (Cocos Nucifera) para RemoÃÃo de Cu(II) de Efluente SintÃtico e Industrial: Estudo de Isoterma de AdsorÃÃo, CinÃtica e Coluna de Leito Fixo / Chemical modification of bark Gross Coco (Cocos Nucifera) Removal of Cu (II) and Synthetic Industrial Effluent From: Study of Adsorption Isotherm, Kinetic and Fixed Bed Column
Os metais pesados sÃo conhecidos por serem altamente tÃxicos em baixÃssimas concentraÃÃes na Ãgua. Sendo assim, numerosos estudos tem sido dedicados à sua remoÃÃo a limites aceitÃveis do ponto de vista ambiental. Tais pesquisas se concentram, principalmente, no desenvolvimento de uma remoÃÃo eficiente e de baixo custo. Muitos mÃtodos tÃm sido p
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/10/2013
-
27. 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
-
28. Avaliação da adsorção do herbicida 2,4-D em carvão ativado em pó e granular por meio de análises de isotermas de adsorção utilizando diferentes qualidades de água
This research aims to evaluate the activated carbon (AC) physical-chemicals characteristics generated from coconuts peel and pinus and associate them to 2,4-D herbicide adsorption capacity of studied activated carbons by adsorption isotherms assay in destilated and deionized water (DDW) and filtered water (FW) from Freundlich and Langmuir models, as well as
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/06/2012
-
29. 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
-
30. 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
-
31. Characterization and use of in natura and calcined rice husks for biosorption of heavy metals ions from aqueous effluents
Heavy metal removal by adsorption using rice husks as a bioadsorbent was evaluated as an alternative for wastewater treatment. Batch equilibrium experiments and kinetic sorption studies were performed using monocomponent solutions of Ni(II), Cd(II), Zn(II), Pb(II) and Cu(II) in surface samples of in natura(RH) and calcined rice husks (RHA). RHA showed higher
Braz. J. Chem. Eng.. Publicado em: 2012-09
-
32. Determination of the maximum retention of cobalt by ion exchange in h-zeolites
This work aimed to determine the maximum content of cobalt that can be incorporated by ion exchange in zeolites H-USY, H-Beta, H-Mordenite, and H-ZSM-5. To reach this goal, batch isotherms at 75ºC were constructed after addition of zeolite samples in flasks filled with cobalt nitrate solution. The equilibrium data were fitted to Langmuir, Freundlich, and T�
Brazilian Journal of Chemical Engineering. Publicado em: 2012-06
-
33. Uso de silicatos modificados na remoção de corantes de efluentes aquosos
This thesis describes the preparation, characterization and application of new inorganic/organic hybrid materials, obtained from organo-functionalization of lamellar surface of derivatives of keniaíta, magadeíta and RUB-18 silicates. The products obtained were treated with silylating agents by different methods. The materials were characterized by FTIR for
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
-
34. MatÃria orgÃnica proveniente de Ãgua residuÃria de suinocultura na interaÃÃo e transporte de alaclor no solo
A aplicaÃÃo de Ãgua residuÃria de suinocultura ao solo como reÃso de Ãgua na agricultura resulta na adiÃÃo de matÃria orgÃnica total e dissolvida, que interferem na dinÃmica dos pesticidas no solo. Objetivou-se avaliar o efeito da aplicaÃÃo de matÃria orgÃnica total e dissolvida proveniente de dois sistemas de tratamento de Ãgua residuÃria d
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/08/2011
-
35. RemoÃÃo de BTEX em SoluÃÃo Aquosa por AdsorÃÃo usando ZeÃlita SintÃtica Modificada. / Removal of BTEX in aqueous solution by adsorption using synthetic zeolite modified.
BTEX (benzene, toluene, ethylbenzene and xylenes) are organic compounds of particular concern due to their toxicity. BTEX occur in the environment as products of incomplete oxidation of fossil fuels, thus polluting the atmosphere. Also, the disposal of industrial effluents, oil spills, and fuels leaks at gas stations are sources of BTEX contamination in soil
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/04/2011
-
36. Avaliação da imobilização do sal trissódico do ácido 1,8 -dihidróxi-2-(4-sulfofenilazol)-3,6-naftalenodisulfônico (SPADNS) em sílica gel / Evaluation of 2-(4-sulphophenylazo)-1,8-dihydroxy-3,6-napthalene disulphonic acid trisodium salt immobilization at silica gel
Solid phase extraction (SPE) is a kind of procedure for preconcentration and choice of solid phase is very important to develop analytical methods because your selectivity, affinity and retention capacity. The metals preconcentration is very used in environmental samples that have metals such as Pb2+, Cd2+, Ni2+, Al3+ at μg L-1. In that sense, the main
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/03/2011