The extraction of uranium from acidic solutions by Adogen impregnated open cell polyurethane foam sponge

Gesser, H. D.; Ahmed, Shahadat

doi:10.1007/bf02039512

Cited by 13 publications

(2 citation statements)

References 15 publications

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“…In the present work, we have involved liquidmembranes-gels (LMGs) which are hydrophobic membranes inflated by specific organic extractants, in order to treat synthetic solutions with the same composition of those of surfaces treatments discharges containing copper and zinc ions. Polystyrene bead form [9,10] or styrene divinylbenzene polymers [11,12], polyurethanes foams [13][14][15][16][17][18][19][20] and silicone rubber [21], were the first to be used as solid supports on which is fixed the extraction solvent in order to lead (form) organic gels. Therefore, the mobile organic phase in the solvent extraction system is replaced by an immobilized phase in a solid matrix [22].…”

Section: Introductionmentioning

confidence: 99%

Separation of Copper and Zinc from aqueous solution using Liquid-Membrane-Gel (LMG) containing Trioctylphosphine Oxide TOPO as Carrier

Taoualit¹,

Abidat²,

Hadj-Boussaad³

2016

International Journal of Computational and Experimental Science and Engineering

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Transfer and extraction of metallic species (Ag + and Cu 2+ ions) through a flat sheet dense supported-liquid-membrane was investigated previously [1, 2] using thin sheets of polybutadiene rubber cross-linked with 0.1% and/or 0.4% of dicumylperoxyde at 160°C for 15 minutes noted BR1 and for 5 minutes noted BR2 [3]. In this work, column filled with a liquid-membrane-gel LMG in form of beads impregnated beforehand with the solvating organo-phosphoric carrier the trioctyl phosphine oxide TOPO, was used to study the extraction-concentration-recovery and the transport of Cu (II) and Zn (II) from an aqueous solution. Extraction of Cu (II) at different pH aqueous solutions has been described. The speciation of the extracted complexes in the membrane supported organic phase (extractant) was also, performed using the theoretically derived equations to elucidate the stoichiometry and the Cu (II) mechanism complexation through the liquid-membrane-gel LMG. Kinetic parameters were calculated from the experimental data. About 86-97% and 50-82% of respectively copper and zinc, were extracted from aqueous solutions at pH = 6 according to first-order kinetics and the separation factor away from the unit. The solvated copper species by TOPO are of the type [Cu(NO3)2]TOPO.

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Section: Introductionmentioning

confidence: 99%

Separation of Copper and Zinc from aqueous solution using Liquid-Membrane-Gel (LMG) containing Trioctylphosphine Oxide TOPO as Carrier

Taoualit¹,

Abidat²,

Hadj-Boussaad³

2016

International Journal of Computational and Experimental Science and Engineering

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“…[23][24][25][26] The commercially available immobilized crown ether (Pb-Spec and Sr-Spec resin) has been used for preconcentration of lead in various matrices. 27,28 The physical immobilization of crown ether on the knotted reactor has been also used for preconcentration and separation of palladium in tunnel dust.…”

Section: Introductionmentioning

confidence: 99%

Determination of thallium traces by ETAAS after on-line matrix separation and preconcentration in a flow injection system

Asadoulahi¹,

Dadfarnia²,

Shabani³

2007

J. Braz. Chem. Soc.

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Um sistema de injeção em fluxo sensível e simples foi desenvolvido para separação, pré-concentração e determinação de tálio. A pré-concentração é baseada na sorção do analito em uma microcoluna de dibenzo-18-coroa-6 (DB18C6) imobilizada em alumina revestida com surfactante e subseqüente eluição com solução de ácido nítrico (500 µL, 2 mol L -1 ). A concentração de tálio no eluente foi determinada por espectrometria de absorção atômica com atomização eletrotérmica. Os fatores que influenciaram a sorção e dessorção de íon tálio foram investigados. Para um volume da amostra de 5 mL, a calibração foi linear no intervalo de 0,1 a 20 µg L -1 (r = 0,9996) com um limite de detecção de 0,05 µg L -1 . A capacidade máxima de sorção foi de 1432 µg de tálio por grama do sorbente. A precisão do método para 1 µg L -1 foi 5,7% RSD (n = 11). O método foi aplicado para determinação de tálio em água, cabelo, unha e em materiais de referência certificados. A exatidão foi avaliada empregando experimentos de adição e recuperação ou por comparação dos resultados com materiais de referência certificados.A simple and sensitive flow injection system was developed for separation, preconcentration and determination of thallium. Preconcentration is based on the analyte sorption on a microcolumn of dibenzo-18-crown-6 (DB18C6) immobilized on surfactant coated alumina with subsequent elution using a nitric acid solution (500 µL, 2 mol L -1 ). The concentration of thallium in the eluent was determined using electrothermal atomic absorption spectrometry. Factors influencing the sorption and desorption of thallium ion were investigated. Using a sample volume of 5 mL, the calibration was linear from 0.1 to 20 µg L -1 range (r = 0.9996) with a detection limit of 0.05 µg L -1 . The maximum sorption capacity was 1432 µg of thallium per gram of sorbent. The precision of the method at 1 µg L -1 was 5.7% RSD (n = 11). The method was applied for determination of thallium in water, hair, nail, and standard reference samples. The accuracy was assessed using addition-recovery experiment or by comparison of the results with certified reference materials.

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Ligand‐grafted biomaterials for adsorptive separations of uranium in solution

Reeves

1999

AIChE Journal

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The extraction of uranium from acidic solutions by Adogen impregnated open cell polyurethane foam sponge

Cited by 13 publications

References 15 publications

Separation of Copper and Zinc from aqueous solution using Liquid-Membrane-Gel (LMG) containing Trioctylphosphine Oxide TOPO as Carrier

Separation of Copper and Zinc from aqueous solution using Liquid-Membrane-Gel (LMG) containing Trioctylphosphine Oxide TOPO as Carrier

Determination of thallium traces by ETAAS after on-line matrix separation and preconcentration in a flow injection system

Ligand‐grafted biomaterials for adsorptive separations of uranium in solution

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