Metal Sorption
Mostrando 1-12 de 48 artigos, teses e dissertações.
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1. AVALIAÇÃO DE NANOTUBOS DE CARBONO FUNCIONALIZADOS VISANDO O DESENVOLVIMENTO DE MÉTODOS DE PRÉ-CONCENTRAÇÃO DE ÍONS METÁLICOS E DETERMINAÇÃO POR TÉCNICAS ESPECTROMÉTRICAS E ELETROANALÍTICAS
This review focuses on the use of functionalized carbon nanotubes (CNTs) on the development of preconcentration methods with substantial contributions on selectivity and sensitivity for metal ions determination. CNTs have been usually employed in the development of preconcentration/speciation coupled to spectroanalytical techniques for ions determination at
Quím. Nova. Publicado em: 2020-09
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2. Kinetic Analysis of Lead Removal by Natural Hydroxyapatite from Aqueous Solution in High Concentration
The aim of this work was to study of the kinetic of Pb(II) sorption, in high lead concentration aqueous solution, by the natural hydroxyapatite (HA) and to verify whether there is a different behavior between natural and synthetic HA under different lead concentrations. Batch experiments were carried out using solutions with high lead concentration, with the
Mat. Res.. Publicado em: 30/09/2019
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3. Biosorption of Mn (II), Co (II) and Cr (VI) in a horizontal rotating tubular bioreactor: experiments and evaluation of the integral bioprocess model
In this research, a multi heavy metals removal process with mixed microbial culture was examined in a horizontal rotating tubular bioreactor (HRTB) with different combinations of process parameters. Three metals were selected as examples of cations (manganese and cobalt) and oxy-anion (hexavalent chromium). Hydrodynamic conditions and biomass sorption capaci
Braz. J. Chem. Eng.. Publicado em: 2014-09
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4. Kinetic modelling of cadmium and lead removal by aquatic mosses
Because biosorption is a low cost and effective method for treating metal-bearing wastewaters, understanding the process kinetics is relevant for design purposes. In the present study, the performance of the aquatic moss Fontinalis antipyretica for removing cadmium and lead from simulated wastewaters has been evaluated. Five kinetic models (first-order, pseu
Braz. J. Chem. Eng.. Publicado em: 2014-03
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5. Recovery of copper (II) absorbed in biomass of Cladosporium cladosporioides
The biosorption process, characterized by the use of biomass for removing metals from aqueous solutions, is an attractive technology using inactive and dead biomasses to remove heavy metals from aqueous solutions in the absence of metabolic activity necessary for intracellular accumulation. The desorption process, which concentrates the metal previously abso
Sci. agric. (Piracicaba, Braz.). Publicado em: 2013-06
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6. Sodium dodecyl sulfate coated γ-alumina support modified by a new Schiff base for solid phase extraction and flame-AAS determination of lead and copper ions
A simple and fast approach for solid phase extraction is herein described, and used to determine trace amounts of Pb2+ and Cu2+ metal ions. The solid phase support is sodium dodecyl sulfate (SDS)-coated γ-alumina modified with bis(2-hydroxy acetophenone)-1,6-hexanediimine (BHAH) ligand. The adsorbed ions were stripped from the solid phase by 6 mL of 4 M nit
Quím. Nova. Publicado em: 2013
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7. Bioadsorção e dessorção dos íons Cd POT. 2+ , Cu POT. 2+ , Ni POT. 2+ , Pb POT. 2+ e Zn POT. 2+ pela macrófita aquáica Azolla pinnata / Biosorption and desorption of Cd POT. 2+ , Cu POT. 2+ , Ni POT. 2+ , Pb POT. 2+ e Zn POT. 2+ by the aquatic macrophyte Azolla pinnata
Research in the technology field has been looking for evaluating efficient and economic techniques and/or process for effluents that contains heavy metal. The biodsorption process has been seemed as a good alternative to the existing technology. This work had the aim to investigate the use of Azolla pinnata macrophyte as biosorbent of five metallic ions: Cd2
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/11/2012
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8. Recuperação de cobre de rejeitos de galvanoplastia utilizando resinas de troca iônica / Recovery of copper of sludges of electroplating using ion exchange resins
Neste estudo, a sorção e recuperação de íons metálicos de resíduos sólidos industriais provenientes de uma indústria de galvanoplastia situada no Rio de Janeiro (Brasil) foram investigadas através da utilização de duas resinas comerciais de troca iônica: Lewatit VPOC 1800 (fortemente ácida, tipo gel) e Lewatit VPOC 1960 (fortemente básica, tip
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/02/2012
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9. Remoção do Manganês e do Sulfato de Água de Mina / Remoção do Manganês e do Sulfato de Água de Mina
As remoções de manganês e de sulfato são importantes desafios no tratamento de águas de mina. O manganês é de difícil remoção devido a sua alta solubilidade em meio ácido ou neutro e pode ser encontrado em altas concentrações nessas águas, conforme a mineralogia das rochas. Por outro lado, a presença de íons sulfato é normalmente devida à o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/02/2012
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10. Investigation about the copper adsorption on the chloropropylsilica gel surface modified with a nanostructured dendrimer DAB-Am-16: an analytical application for determination of copper in different samples
The third generation (G-3) poly(propyleneimine)hexadecaamine dendrimer (DAB-Am-16) was grafted onto the chloropropylsilica gel surface (DPPIPS). The modified silica (DPPIPS) was characterized by Electronic (Uv-Vis), vibrational and Electron Paramagnetic Resonance (EPR), spectrocopies, surface area (331.07 m².g-1) and porosity analyses (pore diameter of 41.9
Mat. Res.. Publicado em: 22/11/2012
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11. 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
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12. 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