Evaluation of Cyanex 923-coated magnetic particles for the extraction and separation of lanthanides and actinides from nuclear waste streams

Shaibu, B. S.; Reddy, M. L. P.; Bhattacharyya, Arunasis; Manchanda, V. Κ.

doi:10.1016/j.jmmm.2005.07.005

Cited by 34 publications

(14 citation statements)

References 20 publications

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“…The use of organophosphorous extractants (Thakur, 2000) and phosphine oxide (Shaibu et al, 2006) has been the most common approach. DEHPA, PC 88A (Gupta and Krishnamurthy, 2004), Cyanex 272 (Komatsu and Freiser, 1989;Li and Freiser, 1986;Banda et al, 2012aBanda et al, , 2012b, Cyanex 302 (Wu et al 2004) and synergistic mixtures (Reddy at al., 1999;El-Nadi 2012;Wu et al, 2007) efficiently extract rare earths from different aqueous medium solutions.…”

Section: Introductionmentioning

confidence: 99%

Separation of rare earths by solvent extraction using DEHPA

Nascimento

Valverde

Ferreira

et al. 2015

Rem: Rev. Esc. Minas

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This paper presents results or the analysis of process variables for separating light REE and heavy REE, in chloride media, by solvent extraction. DEHPA-Isoparaffin was used as the extraction system and the liquor was produced in the laboratory by dissolving REE oxides in HCl to simulate leaching liquor originating from monazitic ores after cerium removal. The following parameters were determined: pH of work, extractant concentration, reaction time, and number of extraction stages. A continuous extraction circuit was operated and its behavior was similar to that shown by batch extraction tests.

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Section: Introductionmentioning

confidence: 99%

Separation of rare earths by solvent extraction using DEHPA

Nascimento

Valverde

Ferreira

et al. 2015

Rem: Rev. Esc. Minas

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“…It is a common practice to leach uranium ores with sulfuric acid and to remove the uranium by conventional solvent extraction or ion exchange methods. However, the mentioned methods are complex processes that suffer from large secondary wastes, significant chemical additives, solvent losses, complex equipment, and bulky design [1,2]. So magnetically assisted chemical separation (MACS) processes can employ magnetite nanoparticles (MNPs) coated with a selective solvent extractant as adsorbent and are mixed with the metal ions solution.…”

Section: Introductionmentioning

confidence: 99%

“…Research at Argonne National Laboratory in USA has already demonstrated the effectiveness of the MACS process for the separation of transuranics [12][13][14]., Strontium [15], cesium [16], and cobalt and nickel [1] Shaibu et al have used Cyanex 923-coated magnetic particles for uptake of Th (IV), U (VI), Am (III) and Eu (III) from simulated nuclear waste solutions. They showed that MACS process for uranium adsorption has more efficiency over traditional solvent extraction [2] Nunez et al evaluated extractant coated magnetite carriers for efficiently separation of radionuclides such as americium and uranium from acidic solutions. The separation of the uranium from acid solutions using TOPO and D2EHPA are three orders of magnitude higher than in traditional solvent extraction techniques.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of U(VI) from aqueous solution by Triocthylamine (TOA) functionalized magnetite nanoparticles as a novel adsorbent

Mansouri

Noaparast

Saberyan

2014

JAC

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Adsorption of U (VI) from aqueous solutions was investigated using magnetically assisted chemical separation (MACS) process. In the present study, Triocthylamine (TOA) functionalized magnetite nanoparticles (TOAFMNPs) were applied as a novel adsorbent for adsorption of U (VI) from aqueous solutions. The effects of initial pH, Triocthylamine to magnetite nanoparticles weight ratio, amount of adsorbent, stirring time and initial U(VI) concentration on U(VI) adsorption efficiency were investigated by batch experiments. The adsorption of U(VI) using this adsorbent was pH dependent, and the optimal pH was 5.5. In kinetics studies, the adsorption equilibrium can be reach within 20 min., and the experimental data were well fitted by the pseudo-second-order model. The highest value of U(VI) adsorption (93.8%) was achieved in optimum conditions. The Langmuir isotherm model correlates well with the U(VI) adsorption equilibrium data for the concentration range 10-80 mg/l. The maximum U(VI) adsorption capacity onto adsorbent was 27.5 mg/g at room temperature. Present study suggests that TOAFMNPs could be employed as a potential adsorbent for U(VI) adsorption, and also could provide a simple and fast separation method for removal of U(VI) ion from solutions

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“…Among the several recent SX approaches, the use of organophosphorous extractants (Huang et al, 2008;Rabie, 2007;Thakur, 2000) and phosphine oxide (Reddy et al, 1998;Shaibu et al, 2006) has been highlighted. D2EHPA, PC 88A (Gupta and Krishnamurthy, 2004), and Cyanex 272 (Komatsu and Freiser, 1989;Li and Freiser, 1986) efficiently extract rare earths from different aqueous medium solutions, but the separation factor between rare earths is not high enough to yield a pure solution of each component.…”

Section: Introductionmentioning

confidence: 99%