Studies on the equilibrium and mechanism of Th(IV) extraction by CYANEX 272 in kerosene from nitrate medium
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S. I. El-Dessouky
Summary
The extraction behavior of Th(IV) from aqueous nitrate medium by the commercial bis(2,4,4-trimethylpentyl) phosphinic acid extractant, (CYANEX 272) in kerosene has been studied. Batch extraction investigation was firstly carried out to elucidate the stoichiometry of the extracted Th(IV) species and deduce the suitable conditions to be applied in the kinetic studies using Lewis cell technique. The extracted species was found to be [Th(OH)3A(HA)3] on the basis of slope analysis method. The different parameters affecting the extraction rate of Th(IV) as well as temperature were separately investigated, and a rate equation was deduced. The experimental results indicate that the rate of Th(IV) extraction is first order dependent on CYANEX 272 concentration, first order dependent on hydrogen ion concentration and inversely first order dependent on thorium concentration. The proposed mechanism for the extraction process is controlled by chemical reaction in the bulk phase rather than at the interface.
© 2004 Oldenbourg Wissenschaftsverlag GmbH
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Articles in the same Issue
- Fission fragment angular momentum in the spontaneous fission of 244Cm
- Limiting transport properties and hydration numbers of actinyl ions in pure water
- Enzymatic U(VI) reduction by Desulfosporosinus species
- Enhanced extraction of thorium(IV) and uranium(VI) with 1-phenyl-3-methyl-4-pivaloyl-5-pyrazolone in the presence of various neutral organophosphorus extractants
- Studies on the equilibrium and mechanism of Th(IV) extraction by CYANEX 272 in kerosene from nitrate medium
- Crown ethers as synergists in the extraction of trivalent lanthanoids with 3-phenyl-4-(4-fluorobenzoyl)-5-isoxazolone
- 99Tc detection in water samples by ICP-MS
- Adsorption and thermodynamic studies of Co(II) and Hg(II) on 2-nitroso-1-naphthol immobilized polyurethane foam using radiotracer technique
- Strontium and cesium sorption to Snake River Plain, Idaho soil
