High surface area functionalized carbon briquettes: a novel adsorbent for contaminants from water

Costa, Luiz C.M.; Araújo, Maria Helena; Sapag, Karim; Sardella, Fabiana; Silva, Hugo; Deiana, Ana Cristina; Lago, Rochel M.

doi:10.1590/s0103-50532005000600002

Cited by 9 publications

(4 citation statements)

References 5 publications

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“…In order to prevent the problems due to the toxicity of mercury, several technologies have been proposed to remove this metal from aqueous media, which include ion exchange, adsorption, sulphide precipitation, electrodeposition, solvent extraction and membrane processes 1 . Among the available technological alternatives for the removal of trace metals from water, adsorption has been considered an economically feasible one [2][3][4][5][6][7][8] . Activated carbons are universal adsorbents that can be obtained from a wide variety of raw materials including wastes of industrial activities [9][10][11][12][13] .…”

Section: Introductionmentioning

confidence: 99%

Adsorption of mercury (II) from liquid solutions using modified activated carbons

et al. 2010

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Mercury is one of the most toxic metals present in the environment. Adsorption has been proposed among the technologies for mercury abatement. Activated carbons are universal adsorbents which have been found to be a very effective alternative for mercury removal from water. The effectiveness with which a contaminant is adsorbed by the solid surface depends, among other factors, on the charge of the chemical species in which the contaminant is in solution and on the net charge of the adsorbent surface which depend on the pH of the adsorption system. In this work, activated carbon from carbonized eucalyptus wood was used as adsorbent. Two sulphurization treatments by impregnation with sulphuric acid and with carbon disulphide, have been carried out to improve the adsorption capacity for mercury entrapment. Batch adsorption tests at different temperatures and pH of the solution were carried out. The influence of the textural properties, surface chemistry and operation conditions on the adsorption capacity, is discussed.

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Section: Introductionmentioning

confidence: 99%

Adsorption of mercury (II) from liquid solutions using modified activated carbons

et al. 2010

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“…[3][4][5] Each method has merits and limitations. Adsorption processes are very versatile and efficient, and have received considerable attention in recent years.…”

Section: Introductionmentioning

confidence: 99%

Characterization of copper adsorption on oxidized activated carbon

Mesquita¹,

Martelli²,

Gorgulho³

2006

J. Braz. Chem. Soc.

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Esse artigo discute a adsorção de íon Cu(II) em carvão ativado oxidado com HNO 3 . As modificações introduzidas na superfície do carvão ativado (CA) foram caracterizadas por medidas de área superficial, espectroscopia de absorção no infravermelho, titulação pelo tradicional método de Boehm e titulação potenciométrica. Os dados da titulação potenciométrica foram ajustados através de um método não linear desenvolvido para determinar a concentração e distribuição do pKa dos sítios ácidos ionizáveis presentes na superfície do CA, antes e após a oxidação com HNO 3 . Os estudos de adsorção foram realizados em batelada para a faixa de concentração de 0,08 a 1,75 mmol L -1 em pH = 4,0. Os resultados mostraram que o tratamento do CA com ácido leva à diminuição na área superficial aparente e produz leves modificações na estrutura de poros. Entretanto, a oxidação influenciou fortemente a estrutura química da superfície do CA através do aumento na concentração de grupos ácidos com pKa < 6, causando assim uma melhora significativa na adsorção do íon Cu(II). A maior capacidade de adsorção do CA oxidado foi relacionada à presença de grupos ácidos com pKa < 4, revelando o importante papel destes grupos na adsorção pelo mecanismo de troca iônica. This paper discusses Cu(II) ion adsorption onto oxidized activated carbon with HNO 3 . The modifications introduced on the activated carbon (AC) surface were characterized by surface area measurement, FT-IR spectroscopy, titration by the traditional Boehm procedure, and potentiometric titration. A nonlinear method for fitting acid-base potentiometric titration data was applied to determine the concentration and pKa distributions of the ionizable acidic sites on AC, before and after HNO 3 oxidation. Adsorption studies were conducted in batch mode for the concentration range 0.08 to 1.75 mmol L -1 and pH = 4.0. Results showed that the acid treatment of AC leads to a decrease in apparent surface areas and produces slight modifications in pore structure. However, oxidation strongly influenced the AC surface chemical structures by increasing the concentration of acidic groups with pKa < 6.0, which significantly improved Cu(II) ion adsorption. The uptake enhanced for oxidized carbon was related to the presence of acidic groups with pKa lower than 4, revealing the important role of acidic groups in adsorption by ion-exchange mechanisms.

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“…The adsorption experiments 8 were carried out with aqueous solutions prepared with Millipore MilliQ water of the dye methylene blue (258C, pH 6.0) or CdCl 2 (258C, pH 6.0, 20 mL at 5 up to 400 mg L À1 ) with 30 mg of the partially hydrolyzed PET in a closed flask for 12 h. The amount of methylene blue adsorbed was obtained by spectrophotometric measurements at l max 627 nm (UV/Vis Varian Cary 50 Conc), and the Cd 2þ concentration after adsorption was measured by atomic absorption (Carls Zeiss Jena AASA).…”

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confidence: 99%

Surface hydrolysis of postconsumer polyethylene terephthalate to produce adsorbents for cationic contaminants

Rosmaninho

Jardim

Moura

et al. 2006

J of Applied Polymer Sci

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In this work, the surface hydrolysis of postconsumer polyethylene terephthalate (PET) was used to produce an ion exchange material to adsorb cationic contaminants from water. The PET surface hydrolyses were carried out in neutral, alkaline, and acid media (NaOH or HNO 3 at 7, 10, and 15 mol L À1) under reflux producing surface carboxylic acid sites (À ÀCOOH) characterized by ATR-IR, pyridine adsorption, titration, TG, and DSC analyses. Acid hydrolysis produced high concentrations of À ÀCOOH (up to 0.5 mmol g À1 PET ), whereas no significant concentration of carboxylic acid sites was obtained by neutral and alkaline hydrolysis. SEM analyses suggest that the acid sites are likely located at the cracks and defects produced on the PET surface by acid hydrolysis. Neutral or alkaline hydrolysis produced a very regular and smooth PET surface with very low acid site concentrations. The adsorption isotherms of Cd þ2 as a model of heavy metal and the dye methylene blue as a model of large organic cationic molecules showed high adsorption capacities for the HNO 3 -hydrolyzed PET, whereas no adsorption takes place on the neutral-or alkaline-hydrolyzed polymer.

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High surface area functionalized carbon briquettes: a novel adsorbent for contaminants from water

Cited by 9 publications

References 5 publications

Adsorption of mercury (II) from liquid solutions using modified activated carbons

Adsorption of mercury (II) from liquid solutions using modified activated carbons

Characterization of copper adsorption on oxidized activated carbon

Surface hydrolysis of postconsumer polyethylene terephthalate to produce adsorbents for cationic contaminants

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