Extraction of uranium(VI) with diamides of dipicolinic acid from nitric acid solutions

Lapka, Joseph L.; Paulenová, Alena; Alyapyshev, M. Yu.; Бабаин, В. А.; Herbst, Ronald; Law, Jack D.

doi:10.1524/ract.2009.1588

Cited by 74 publications

(50 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[4][5][6][7][8][9][10] The amide ligands consist of only C, H, O and N atoms so that they are completely incinerable. As a result, the amount of solid radioactive wastes generated in the amide-based processes could be significantly reduced.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics, Optical Properties, and Coordination Modes of Np(V) with Dipicolinic Acid

2009

View full text Add to dashboard Cite

Complexation of NpO 2+ with dipicolinic acid (DPA) has been investigated in 1 M NaClO 4 at 25ºC. Two complexes, NpO 2 (DPA) -and NpO 2 (DPA) 2 3-, were identified and the stability constants (logβ 1 and logβ 2 ) were determined to be 8.68 and 12.31 by spectrophotometry. The enthalpies of the complexation (ΔH 1 and ΔH 2 ) were measured to be -25.2 and -45.9 kJ/mol by microcalorimetry. The entropies (ΔS 1 and ΔS 2 ) were calculated to be 81.6 and 81.8 J/(K⋅mol) accordingly. The strong complexation of NpO 2 + with DPA is driven by both positive entropies and highly exothermic enthalpies.The crystal structure of Na 3 NpO 2 (DPA) 2 (H 2 O) 6 (s) shows that, in the NpO 2 (DPA) 2 3-complex, the Np atom sits at a center of inversion and the two DPA ligands symmetrically coordinate to Np in a tridentate mode. Due to the centrosymmetric structure of the NpO 2 (DPA) 2 3-complex, the f→f transitions of Np(V) are forbidden, and the sharp bands originating from the f→f transitions either 1 disappear or become very weak in the optical absorption or diffuse reflectance spectra of the NpO 2 (DPA) 2 3-complex.

show abstract

Section: Introductionmentioning

confidence: 99%

Thermodynamics, Optical Properties, and Coordination Modes of Np(V) with Dipicolinic Acid

2009

View full text Add to dashboard Cite

show abstract

“…14,15 Three structural isomers of di-amides were synthesized and investigated on extractability toward uranium(VI). 16 Back extraction studies revealed that among all common strippants used, 0.5 mol L -1 solution of (NH 4 ) 2 CO 3 was the most suitable.…”

Section: Introductionmentioning

confidence: 99%

Solvent extraction studies on uranium using amine based extractants and recovery from low grade ore leach liquors

Kim¹,

Kumar²,

Kim³

et al. 2012

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

Neste estudo, extratores à base de amina (Alamine 336, Alamine 308, Alamine 304 e Aliquat 336) diluídos em querosene foram usados para extração de urânio e separação de outros elementos associados. Alamine 336 foi o melhor extrator para o processo de extração de urânio de soluções de sulfato quando comparado com outros reagentes à base de amina, Alamine 308, 304 Alamine 336 e Aliquat 336. O comportamento da extração sinérgica foi estudado com aminas como extratantes assim como reagentes sinergistas e organofosforados usados em misturas sinergistas com aminas. Os estudos de extração sinérgica com aminas não foram adequados entre si para melhor eficiência da extração. No entanto, aminas misturadas com extratores organofosforados forneceram comportamento sinérgico positivo, com um coeficiente de 0,567, calculado a partir de resultados obtidos. A metodologia desenvolvida foi aplicada ao processamento de minério de baixo grau de urânio, e 99,83% de urânio foi recuperado sem interferências de outros metais.In this study, amine based extractants (Alamine 336, Alamine 308, Alamine 304 and Aliquat 336) diluted in kerosene were used as promising extractants for uranium extraction and separation from other associated elements. Alamine 336 was the best extractant for uranium extraction process from sulfate solutions when compared with other amine based extractants, Alamine 308, Alamine 304 and Aliquat 336. Synergistic extraction behavior was studied with amines as extractants as well as synergists and organophosphorus reagents used as synergist mixed with amines. Synergistic extraction studies with amines were not suitable with each other for better extraction efficiency. However, amines mixed with organophosphorus extractants gave positive synergetic behavior with the highest synergistic coefficient 0.567 calculated from results obtained. The developed methodology was applied to uranium low grade ore processing and 99.83% of uranium was recovered without the interferences of other metals.

show abstract

“…In the past decades, many methods have been developed for uranium(VI) removal from aqueous solutions [3][4][5][6][7][8][9][10][11] ,such as ionic exchange, chemical precipitation [12,13], membrane dialysis [14], flotation [15,16], bio-concentration [17], liquid-liquid extractions [18,19], solid-liquid separation [5,20,21]. At present, solid-liquid separation is recognized as the widest application prospect because it can work more efficiently and it is environment-friendly.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of polyamidoxime-functionalized nanoparticles for uranium(VI) removal from neutral aqueous solutions

Huang

Zhang²,

Hua

2015

J Radioanal Nucl Chem

View full text Add to dashboard Cite

It is important to separate uranium(VI) from water environment due to its high toxicity and radioactivity. A new kind of polystyrene nanoparticles with polyamidoxime is reported here for removal of uranium(VI) from aqueous solutions. The obtained PSt nanoparticles have a tunable sorption capacity. The sorption process follows pseudo-second-order kinetics, and the equilibrium can be reached within 6 h. Furthermore, the optimal pH value of sorption process is 6.5, and the adsorbents can be recycled well for uranium(VI) sorption from aqueous solution. This work indicates that the polyamidoxime-functionalized PSt nanoparticles may be used as a good adsorbent for the removal of uranium(VI) from neutral aqueous solution.

show abstract

Extraction of uranium(VI) with diamides of dipicolinic acid from nitric acid solutions

Cited by 74 publications

References 19 publications

Thermodynamics, Optical Properties, and Coordination Modes of Np(V) with Dipicolinic Acid

Thermodynamics, Optical Properties, and Coordination Modes of Np(V) with Dipicolinic Acid

Solvent extraction studies on uranium using amine based extractants and recovery from low grade ore leach liquors

Synthesis of polyamidoxime-functionalized nanoparticles for uranium(VI) removal from neutral aqueous solutions

Contact Info

Product

Resources

About