Extraction chromatographic studies of metal ions using N,N,N′,N′-tetraoctyl diglycolamide as the stationary phase

Ansari, Seraj A.; Pathak, P. N.; Husain, M.; Prasad, Ashok K.; Parmar, V. S.; Manchanda, V. Κ.

doi:10.1016/j.talanta.2005.07.042

Cited by 85 publications

(47 citation statements)

References 21 publications

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“…It is intriguing to observe that TODGA extracts trivalent actinides better than tetravalent= hexavalent actinides which are its unique characteristics (13). We have carried out extensive studies on the solvent extraction, extraction chromatographic, and membranebased separations of actinides using TODGA as the extractant (12,(14)(15)(16). Out of all these separation methods, the supported liquid membrane based separation methods were found to be the most promising.…”

Section: Transport Of Thorium(iv) Across a Supported Liquidmentioning

confidence: 99%

Transport of Thorium(IV) Across a Supported Liquid Membrane Containing N,N,N′,N′-Tetraoctyl-3-oxapentanediamide (TODGA) as the Extractant

Panja

Mohapatra

Tripathi

et al. 2010

Separation Science and Technology

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The transport behavior of Th 4þ was investigated from a feed containing 3.0 M HNO 3 into a receiver phase containing 0.1 M oxalic acid across a PTFE flat sheet supported liquid membrane (SLM) which contained TODGA (N,N,N 0 ,N 0 -Tetraoctyl-3-oxapentanediamide) in n-dodecane as the extractant. Effects of the nature of the strippant, extractant concentration, Th concentration in the feed, and feed acidity on the transport rates were investigated. The transport behavior apparently depended on the rate of extraction of the metal ion at the feed-membrane interface and was not diffusion controlled. Influence of Th concentration on flux was also investigated. Transport mechanism was elucidated and the diffusion coefficient was calculated to be 2.13 Â 10 À7 cm 2 / s. Solvent extraction studies at varying feed acidity and TODGA concentration were also carried out.

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Section: Transport Of Thorium(iv) Across a Supported Liquidmentioning

confidence: 99%

Transport of Thorium(IV) Across a Supported Liquid Membrane Containing N,N,N′,N′-Tetraoctyl-3-oxapentanediamide (TODGA) as the Extractant

Panja

Mohapatra

Tripathi

et al. 2010

Separation Science and Technology

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“…N,N,N´,N´-Tetraoctyl diglycolamide (TODGA) has been extensively studied by various groups for the co-extraction of lanthanides and actinides. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] It is reported that TODGA also extracts some of the fission products from highly acidic HLW. [15,16] It is also reported that the branching of the alkyl chain attached to the acyl N atoms of the diglycolamides suppresses the co-extraction of fission products.…”

Section: Introductionmentioning

confidence: 99%

Studies on the Use ofN,N,N´,N´-Tetra(2-ethylhexyl) Diglycolamide (TEHDGA) for Actinide Partitioning. I: Investigation on Third-Phase Formation and Extraction Behavior

Deepika

Sabharwal

Srinivasan

et al. 2010

Solvent Extraction and Ion Exchange

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Diglycolamides have emerged as an interesting class of extractants for actinide partitioning from high-level waste (HLW). N,N,N´,N´-tetraoctyl diglycolamide (TODGA) has been extensively studied for lanthanide-actinide co-extraction behavior. The present work deals with a branched isomer of TODGA, that is, N,N,N´, N´-tetra(2-ethylhexyl) diglycolamide (TEHDGA). TEHDGA was studied for the extraction of 241 Am and third-phase formation. The effect of using different phase modifiers on the prevention of the formation of a third phase during nitric acid extraction by TEHDGA along with the acid uptake behavior by TEHDGA in the presence of the modifiers was studied. The modifiers used for this purpose were di (n-hexyl)octanamide (DHOA), isodecanol, and n-decanol. The effect of the modifiers on the uptake of 241 Am as a function of acid concentration and as a function of modifier concentration was also examined. DHOA was found to be a suitable modifier, in spite of its high acid uptake. The uptake of lanthanides Ce, La, Eu, Gd, and Nd and elements such as Fe, Ni, Mn, Mo, Ru, Sr, and Cs with DHOA-modified TEHDGA-n-dodecane solvent systems were investigated. The results obtained indicated that, while DHOA-modified TEHDGA/n-dodecane extracted lanthanides and actinides, it did not show any significant uptake of other elements. Thus, the TEHDGA-DHOA/n-dodecane solvent system can be used effectively for the partitioning of lanthanides and actinides from HLW.

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“…In recent years, scandium extraction by extraction resins containing organophosphorus extractants has been studied in detail by a number of researchers. 17,18 Unfortunately, the impregnation strategies employed in extraction resins demonstrate pronounced leaching of the aqueous phase and a lack of reusability, 19 thus hampering their applicability. To overcome such issues, enhancing the interaction between the extractant and the support has been proposed.…”

Section: Introductionmentioning

confidence: 99%

High‐performance polymer‐supported extractants with phosphonate ligands for scandium(III) separation

Cui

Chen

et al. 2016

AIChE Journal

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in Wiley Online Library (wileyonlinelibrary.com) As the market demand for scandium has grown, a great deal of interest has been generated in its recovery. To substantially simplify the process and provide a green alternative for scandium separation, novel polymer-supported extractants containing di(2-ethylhexyl) phosphonate and bis(2,4,4-trimethylpentyl) phosphonate, [D201][DEHP] and [D201] [C272] are proposed because they demonstrate improved adsorption capacity and selectivity toward scandium(III). Scandium(III) adsorption is significantly affected by the solution pH, with the maximum adsorption occurring at a pH of approximately 0.78. The batch adsorption data fit well with the Langmuir isotherm and pseudo-second-order kinetic models. A combination of the Fourier transform infrared and XPS spectra suggest that the complexation of oxygen atoms in phosphate groups with scandium(III) is the predominant adsorption mechanism. Additionally, the two resins were used to recover scandium from leaching liquor of nickel laterite ore. [D201][DEHP] exhibits unusual selectivity for scandium and low competitive behavior with other metals, thus increasing its market potential. V C 2016 American Institute of Chemical Engineers AIChE J, 62: 2479-2489, 2016 Keywords: polymer-supported extractants, scandium(III), adsorption mechanism, nickel laterite ore IntroductionThe recovery of scandium has received considerable academic interest, owing to its potential importance in many applications-for instance, aluminum-scandium alloys, advanced ceramics, metal halide lamps, solid oxide fuel cells, nuclear materials and lasers.1 All of these applications have led to an increase in the industrial demand for scandium; unfortunately, the commercial application of scandium continues to be thwarted by its low availability; it remains difficult to obtain because it is distributed sparsely and occurs only in trace amounts in many complicated minerals.2 As a result, scandium is usually recovered as a byproduct of uranium and tungsten production 3,4 or the processing of nickel laterite ores 5 and bauxite. 6 For example, in Australia, the nickel laterite ores contain a relatively high content of scandium and are considered to be important scandium resources. Scandium can be recovered as a byproduct during nickel and cobalt extraction operations. A typical nickel laterite ore mainly consists of Ni (1-2%), Co (0.05-0.10%), Fe (15-50%), Al (2-5%), and trace amounts of Sc (0.005-0.006%).7 Considering their increasing demand and scarcity, the recovery of valuable minor elements-particularly scandium, which is associated with nickel laterite ore-is highlighted in research.After sulfuric acid leaching under atmospheric pressure, 8 scandium is normally separated and recovered by solvent extraction and ion exchange techniques in the processing of nickel laterite ore. 9-11 However, these processes that attempt to recover scandium still face the problem that the concentration of scandium is low (below 20 ppm), but the concentrations of iron and aluminum i...

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Extraction chromatographic studies of metal ions using N,N,N′,N′-tetraoctyl diglycolamide as the stationary phase

Cited by 85 publications

References 21 publications

Transport of Thorium(IV) Across a Supported Liquid Membrane Containing N,N,N′,N′-Tetraoctyl-3-oxapentanediamide (TODGA) as the Extractant

Transport of Thorium(IV) Across a Supported Liquid Membrane Containing N,N,N′,N′-Tetraoctyl-3-oxapentanediamide (TODGA) as the Extractant

Studies on the Use ofN,N,N´,N´-Tetra(2-ethylhexyl) Diglycolamide (TEHDGA) for Actinide Partitioning. I: Investigation on Third-Phase Formation and Extraction Behavior

High‐performance polymer‐supported extractants with phosphonate ligands for scandium(III) separation

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