Determination of uranium(VI) in natural waters after preconcentration on adsorbent containing m-aminophenol fragments

Басаргин, Н. Н.; Магеррамов, А. М.; Гаджиева, Севиндж Рафик; Bahmanova, F. N.; Gamidov, S. Z.; Алиева, Тарана Ибрагим; Chyragov, F. M.

doi:10.1134/s1061934813020032

Cited by 7 publications

(2 citation statements)

References 3 publications

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“…[UO 2 (CO 3 ) 3 ] 4– , the dissolved species of uranium in seawater, makes its extraction chemically possible by conventional methods i.e., solvent extraction, coprecipitation, ion exchange, electrode deposition, membrane filtration, coagulation, etc. Of the various separation technologies investigated for uranium recovery from seawater, however, solid phase extraction by chelating adsorbent polymers was found to be the most feasible preconcentration-separation process in terms of cost, adsorption capacity, and environmental footprint. − Scientists in many countries including the United States, Great Britain, Germany, Japan, Russia, South Korea, China, India, and Turkey have been involved in the development of adsorbents to extract uranium from seawater since the 1960s . A group of scientists at the Japan Atomic Energy Agency (JAEA) achieved a capacity of 1.5 g of uranium per kg of amidoxime-functionalized polyethylene braided fiber adsorbent in 30 days of exposure in seawater in the Okinawa area of Japan .…”

Section: Introductionmentioning

confidence: 99%

Extracting Uranium from Seawater: Promising AF Series Adsorbents

Das

Oyola

Mayes

et al. 2015

Ind. Eng. Chem. Res.

156

141

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A new family of high-surface-area polyethylene fiber adsorbents named the AF series was recently developed at the Oak Ridge National Laboratory (ORNL). The AF series adsorbents were synthesized by radiation-induced graft polymerization of acrylonitrile and itaconic acid (at different monomer/comonomer mol ratios) onto high surface area polyethylene fibers. The degree of grafting (%DOG) of AF series adsorbents was found to be 154−354%. The grafted nitrile groups were converted to amidoxime groups by treating with hydroxylamine. The amidoximated adsorbents were then conditioned with 0.44 M KOH at 80 °C followed by screening at ORNL with sodium-based synthetic aqueous solution, spiked with 8 ppm uranium. The uranium adsorption capacity in simulated seawater screening ranged from 170 to 200 g-U/kg-ads irrespective of %DOG. A monomer/comonomer molar ratio in the range of 7.57−10.14 seemed to be optimum for highest uranium loading capacity. Subsequently, the adsorbents were also tested with natural seawater at Pacific Northwest National Laboratory (PNNL) using flow-through column experiments to determine uranium loading capacity with varying KOH conditioning times at 80 °C. The highest adsorption capacity of AF1 measured after 56 days of marine testing was demonstrated as 3.9 g-U/kg-adsorbent and 3.2 g-U/kg-adsorbent for 1 and 3 h of KOH conditioning at 80 °C, respectively. Based on capacity values of several AF1 samples, it was observed that changing KOH conditioning from 1 to 3 h at 80 °C resulted in a 22−27% decrease in uranium adsorption capacity in seawater.

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Section: Introductionmentioning

confidence: 99%

Extracting Uranium from Seawater: Promising AF Series Adsorbents

Das

Oyola

Mayes

et al. 2015

Ind. Eng. Chem. Res.

156

141

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“…A method of sorption-photometric determination of uranium(VI) in seawater has been developed. [6] The reaction of U(VI) with pyrocatechol violet, in the absence and in the presence of cationic surfactants, was studied. The developed method is applied to the analysis of complex matrices for U(VI).…”

Section: Introductionmentioning

confidence: 99%

Mixedligand complexes of uranium (VI) with dithiolophenols and hydrophobic amines in photometric analysis

Kuliev

Zalov

Aliev

et al. 2020

Vietnam Journal of Chemistry

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In this paper we studied the interaction of uranium (VI) with with dithiolphenols (2,6‐dithiophenol, 2,6‐dithiol‐4‐methylphenol, 2,6‐dithiol‐4‐ethylphenol, 2,6‐dithiol‐4‐tert‐butylphenol), and hydrophobic amines by absorption spectroscopy method. The sudied hydrophobic amines are aniline, N–methylaniline, N,N–dimethylaniline, diphenylguanidine, triphenylguanidine, benzylamine, phenantrolin, dipyridyl, p‐aninopyridin, 2‐(N,N‐dimethylaminomethyl)‐4‐methylphenol and 2‐(N,N‐dimethylaminomethyl)‐4‐bromphenol. The optimal conditions for the formation and extraction of ionic associates were found and the ratios of components in the complexes were established. It was found that associates are formed in a weakly acidic medium (pHopt = 3.5‐7.1). The maxima in the light absorption spectra are observed at λ = 434‐478 nm. Molar coefficient of absorption is equal ε = (2.65‐3.62)•104. On the basis of the obtained data, photometric methods of uranium determination in various objects have been developed.

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