High selective extraction for thorium(IV) with NTAamide in nitric acid solution: Synthesis, solvent extraction and structure studies

Huang, Huang; Ding, Songdong; Su, Dongping; Liu, Ning; Wang, Jieru; Tan, Mengling; Fei, Jianen

doi:10.1016/j.seppur.2014.10.008

Cited by 52 publications

(36 citation statements)

References 36 publications

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“…When HNO3 concentration exceeds 0.01 mol/L, the downward trend is more obvious. This can be ascribed to the competition extraction of HNO3 [8], especially at high acidity. The separation factors of Am(III) and Eu(III) under different concentrations of HNO3 were calculated and listed in Table 1.…”

Section: Both Dam Andmentioning

confidence: 99%

Selective extraction of americium(III) over europium(III) ions in nitric acid solution by NTAamide(C8) using a novel water-soluble bisdiglycolamide as a masking agent

Wang

Ding

et al. 2017

Separation and Purification Technology

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A novel water-soluble ligand of N,bisdiglycolamide (TEE-BisDGA) was synthesized and used as a masking agent for selective extraction of Am(III) over Eu(III) from HNO3 solution by Nhexaoctylnitrilotriacetamide (NTAamide(C8)) in kerosene. Influences of acidity, concentration of water-soluble ligands and extractant on the distribution ratios (D) and separation factors (SF) of Am(III) and Eu(III) were investigated. In the range of examined acidity from 0.001 to 0.2 mol/L, DAm and DEu decreased with the increase of HNO3 concentration. Using 0.1 mol/L NTAamide(C8) as an extractant, the maximum SFAm/Eu of 26 can be obtained in the presence of 0.01 mol/L TEE-BisDGA in aqueous phase with pH of 3.0, which was significantly higher than that case with no TEE-BisDGA. Job's method and mole ratio method were employed for extraction mechanism research. It has been shown that Am(III) and Eu(III) formed di-solvated species with TEE-BisDGA and mono-solvated species with NTAamide(C8), © 2017. This manuscript version is made available under the Elsevier user license http://www.elsevier.com/open-access/userlicense/1.0/ respectively. Moreover, the stability constants logβ values were obtained from UV-vis adsorption spectroscopic titration for Nd(III) complexes with TEE-BisDGA and N,N,N',N'-tetraethyldiglycolamide (TEDGA), which indicated that TEDGA had a stronger complex ability than TEE-BisDGA.

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Section: Both Dam Andmentioning

confidence: 99%

Selective extraction of americium(III) over europium(III) ions in nitric acid solution by NTAamide(C8) using a novel water-soluble bisdiglycolamide as a masking agent

Wang

Ding

et al. 2017

Separation and Purification Technology

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“…Many techniques have been used for Th separation, including precipitation [ 24 – 26 ], solvent extraction [ 27 , 28 ], and adsorption [ 9 , 21 , 29 – 35 ]. Among these processes, adsorption is arguably the simplest, most adaptable, useful, and well–established technique for Th separation [ 36 ].…”

Section: Introductionmentioning

confidence: 99%

Selective biosorption of thorium (IV) from aqueous solutions by ginkgo leaf

Huang

Chen

et al. 2018

PLoS ONE

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Low–cost biosorbents (ginkgo leaf, osmanthus leaf, banyan leaf, magnolia leaf, holly leaf, walnut shell, and grapefruit peel) were evaluated in the simultaneous removal of La3+, Ce3+, Pr3+, Nd3+, Sm3+, Eu3+, Gd3+, Yb3+, Lu3+, UO22+, Th4+, Y3+, Co2+, Zn2+, Ni2+, and Sr2+ from aqueous solutions. In single metal systems, all adsorbents exhibited good to excellent adsorption capacities toward lanthanides and actinides. In a simulated multicomponent mixed solution study, higher selectivity and efficiency were observed for Th4+ over other metal cations, with ginkgo leaves providing the highest adsorptivity (81.2%) among the seven biosorbents. Through optimization studies, the selectivity of Th4+ biosorption on ginkgo leaf was found to be highly pH–dependent, with optimum Th4+ removal observed at pH 4. Th4+ adsorption was found to proceed rapidly with an equilibrium time of 120 min and conform to pseudo–second–order kinetics. The Langmuir isotherm model best described Th4+ biosorption, with a maximum monolayer adsorption capacity of 103.8 mg g–1. Thermodynamic calculations indicated that Th4+ biosorption was spontaneous and endothermic. Furthermore, the physical and chemical properties of the adsorbent were determined by scanning electron microscopy, Brunauer–Emmett–Teller, X-ray powder diffraction, and Fourier transform infrared analysis. The biosorption of Th from a real sample (monazite mineral) was studied and an efficiency of 90.4% was achieved from nitric acid at pH 4 using ginkgo leaves.

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“…[ 25‐26 ] In this work, we directly irradiated a Th‐Pu mixed HNO 3 solution with UV light and then performed extraction by an amide extractant N,N,N',N',N”,N” ‐hexaoctylnitrilotriacetamide (NTAamide( n ‐Oct)), which has been found to exhibit high selectivity to Th(IV) over U(VI). [ 27‐28 ] As shown in Figure 3a, through one single stage extraction, Th(IV) was preferably extracted into the organic phase ( D Th = 12.6) while most of the oxidized Pu in the form of PuO 2 2+ remained in the aqueous phase ( D Pu = 0.127), achieving a high Th/Pu separation factor ( SF Th/Pu ) of 100 as compared to only 5 if without light irradiation.…”

Section: Resultsmentioning

confidence: 99%

Light‐Driven Oxidation of Pu(IV) to Pu(VI) Enables Green and Efficient Pu Recovery

et al. 2021

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Main observation and conclusion Plutonium (Pu) is a key actinide in nuclear industry and is the only element in the periodic table known to date that could exist in four different oxidation states simultaneously in aqueous solution. Efficient recovery of Pu in nuclear wastes relies greatly on the precise control of its oxidation states. Herein, we introduce a light‐driven oxidation approach that could effectively oxidize Pu(IV) to Pu(VI) in acidic solutions without the addition of extra chemical oxidants. The oxidation proceeds via the reaction of Pu(IV) with the oxidative species induced by UV light irradiation. This approach can help with the separation of Pu from other metals and can be further extended to a biphasic extraction system to achieve green and efficient stripping of Pu from an organic solvent.

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High selective extraction for thorium(IV) with NTAamide in nitric acid solution: Synthesis, solvent extraction and structure studies

Cited by 52 publications

References 36 publications

Selective extraction of americium(III) over europium(III) ions in nitric acid solution by NTAamide(C8) using a novel water-soluble bisdiglycolamide as a masking agent

Selective extraction of americium(III) over europium(III) ions in nitric acid solution by NTAamide(C8) using a novel water-soluble bisdiglycolamide as a masking agent

Selective biosorption of thorium (IV) from aqueous solutions by ginkgo leaf

Light‐Driven Oxidation of Pu(IV) to Pu(VI) Enables Green and Efficient Pu Recovery

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