Floatation-extraction recovery of U(VI) by means of thin emulsified solutions of trialkylamine in white spirit

Perlova, O. V.; Shirykalova, A. A.

doi:10.3103/s1063455x0804005x

Cited by 4 publications

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“…The objects of investigation were solutions of ura nyl acetate containing 2 × 10 -4 mol of uranium(VI) and 2 × 10 -2 mol of carbonate or sulfate ions per liter. The solutions were prepared from reagent grade UO 2 (CH 3 COO) 2 [4]. Experiments on the kinetics of sorption of uranium compounds from carbonate and sulfate solutions were performed at initial and experimentally established [5] optimum pH values, namely, pH 4 (starting carbonate solutions) and 7 (sulfate solutions).…”

Section: Methodsmentioning

confidence: 99%

“…Experiments on the kinetics of sorption of uranium compounds from carbonate and sulfate solutions were performed at initial and experimentally established [5] optimum pH values, namely, pH 4 (starting carbonate solutions) and 7 (sulfate solutions). In the starting car bonate solutions with pH 4, uranium(VI) was in the form of a mixture of UO (91%) and UO 2 OH + (9%) cations; in sulfate solutions with pH 7, as a mixture of UO 2 OH + (13.7%) and UO 2 (OH) 2 (86.3%) [4].…”

Section: Methodsmentioning

confidence: 99%

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Kinetics of sorption of uranium(VI) compounds with zirconium-silica nanosorbents

Perlova

Sazonova

Perlova

et al. 2014

Russ. J. Phys. Chem.

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The kinetics of sorption of uranium(VI) compounds from sulfate and carbonate solutions using four samples of mesoporous zirconium-silica nanosorbents obtained by bitemplate (solubilization) synthesis was studied. The sorption equilibrium set in time and the kinetic characteristics of sorption were shown to depend on the sorbent (its composition, specific surface area, dispersity, and pore size), the temperature, and the composition and pH of the solution from which uranium compounds are sorbed. The sorption kinetics was described by a first order equation. The limiting stage of the process was found to be the external diffusion of uranium containing particles to the sorbent surface.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Kinetics of sorption of uranium(VI) compounds with zirconium-silica nanosorbents

Perlova

Sazonova

Perlova

et al. 2014

Russ. J. Phys. Chem.

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Toxicity of Solvents Part I: Conventional Solvents

Li,

Lu,

Mumford

2024

Reference Module in Chemistry, Molecular Sciences and Chemical Engineering

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Peculiarities of U(VI) sorption on composites containing hydrated titanium dioxide and potassium-cobalt hexacyanoferrate(II)

Perlova¹,

Dzyazko²,

Malinovska³

et al. 2021

Him. Fiz. Tehnol. Poverhni

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As opposed to polymer sorbents, inorganic materials are stable against ionizing radiation. This gives a possibility to use them for the removal of radionuclides from water. As a rule, highly selective inorganic sorbents are obtained in a form of finely dispersive powder. This makes it difficult to use them in practice. Here the composites based on hydrated titanium dioxide containing K2Co[Fe(CN)6] have been developed. The modifier was inserted into partially (hydrogel) and fully (xerogel) formed oxide matrices. Modifying of hydrogel followed its transformation to xerogel provides the formation of potassium-cobalt hexacyanoferrate(II) nanoparticles (up to 10 nm), which are not washed out in aqueous media due to encapsulation in hydrated oxide. A number of the methods for sample characterization were used in this work: transmission electronic microscopy for vizualization of embedded nanoparticles, optical microscopy to measure granule size, FT-IR spectroscopy, X-ray fluorescence spectroscopy for chemical analysis of the samples, potentiometric titration to estimate ion exchange properties, and spectrophotometric analysis of the solution to determine U(VI) concentration. The features of U(VI) sorption from nitrate and sulfate solutions are considered: the effect of the sorbent dosage and solution composition was in a focus of attention. The influence of the modifier is the most pronounced at pH ³ 4, when U(VI) is in a form of one-charged cations (UO2OH+): the removal degree of U(VI) is close to 100 %. This positive effect of the selective constituent is expressed in a presence of an excess of NO3–, SO42– and Na+ ions. The model of chemical reaction of pseudo second order has been applied to sorption. Both pristine sorbent and composite are most completely regenerated with a 0.1 M KOH solution - the regeneration degree is 92 and 96 % respectively. In this case, the half-exchange time is minimal and equal to » 23 min (initial hydrated titanium dioxide) and 47 min (composite). Desorption obeys the model of particle diffusion: the diffusion coefficients for ions being exchanged are (1.7–7.6)´10–13 m2s–1.

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Floatation-extraction recovery of U(VI) by means of thin emulsified solutions of trialkylamine in white spirit

Cited by 4 publications

References 0 publications

Kinetics of sorption of uranium(VI) compounds with zirconium-silica nanosorbents

Kinetics of sorption of uranium(VI) compounds with zirconium-silica nanosorbents

Toxicity of Solvents Part I: Conventional Solvents

Peculiarities of U(VI) sorption on composites containing hydrated titanium dioxide and potassium-cobalt hexacyanoferrate(II)

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