Extraction behavior of cerium by tetraoctyldiglycolamide from nitric acid solutions

Metwally, Essam; Saleh, Asri; Abdel-Wahaab, S. M.; El‐Naggar, H. A.

doi:10.1007/s10967-010-0641-2

Cited by 12 publications

(7 citation statements)

References 19 publications

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“…Extracted Ce(III) is represented by an increase in UV-V absorbance at a λmax of 346 nm which, while occurring at an initially steady rate at t = < 60 min, begins to plateau as the rate of Ce extraction slows significantly at t = > 60 min, Figure 3 (a). This marked change is not attributable to complete extraction as depletion of the aqueous Ce(III) solution is not observed, nor is it attributable to having reached the loading capacity of the extractant molecule as the quantity of TODGA in the RDC system should capably extract all available Ce(III) [7].…”

Section: Discussionmentioning

confidence: 97%

The Effects of Nitric Acid on Extraction Properties of TODGA During Fission Product Management

Bromley

Boxall

2016

MRS Advances

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In the context of management of the wastes arising from the reprocessing of spent nuclear fuel, studies have been conducted into the solvent extraction kinetics of lanthanide fission products by TODGA and the effects of solvent phase acidity on the effectiveness of this organic extractant molecule. In this study we observe an increase in organic phase viscosity increasing acidity and, potentially by consequence, that the rate of cerium extraction is summarily decreased.

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Section: Discussionmentioning

confidence: 97%

The Effects of Nitric Acid on Extraction Properties of TODGA During Fission Product Management

Bromley

Boxall

2016

MRS Advances

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“…9 The amide extractant, N,N,N' ,N'-tetraoctyldiglycolamide (TODGA) was also tested for extraction of Ce(III) from nitric acid solutions. 10 The dependence of cerium distribution ratio on TODGA, hydrogen ion, nitrate ion, cerous ion and nitric acid concentrations was investigated from the equilibrium studies and the results indicated the main extracted species to be Ce(TODGA) 2 (NO 3 ) 3 HNO 3 . A number of other extractants such as di-(2-ethylhexyl) 2-ethylhexyl phosphonate (DEHEHP), 11,12 tricaprylmethylammonium chloride (TCMA) 13 and N-n-octylaniline 14 have also been used for the extraction and separation of Ce(IV).…”

Section: F and Allanite (A 2 B 3 Si 3 O 12 [Oh])mentioning

confidence: 99%

“…In another study the recovery of cerium and the synergistic extraction were carried out using a mixture of Cyanex 923 and D2EHPA in n‐heptane . The amide extractant, N,N,N',N'‐tetraoctyldiglycolamide (TODGA) was also tested for extraction of Ce(III) from nitric acid solutions . The dependence of cerium distribution ratio on TODGA, hydrogen ion, nitrate ion, cerous ion and nitric acid concentrations was investigated from the equilibrium studies and the results indicated the main extracted species to be Ce(TODGA) 2 (NO 3 ) 3 HNO 3 .…”

Section: Introductionmentioning

confidence: 99%

Comparison of hollow fiber membrane and solvent extraction techniques for extraction of cerium and preparation of ceria by stripping precipitation

Rout

Sarangi

2014

J of Chemical Tech & Biotech

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BACKGROUND The extraction of cerium by hollow fiber supported liquid membrane using tri‐octyl methyl ammonium chloride (TOMAC) as mobile carrier was studied and the result was compared with solvent extraction data. The effect of different parameters such as pH, flow rates, extractant concentration, metal ion concentration and strip solution concentration on cerium extraction was investigated. RESULTS These parameters were optimized for maximum cerium flux and were found to be: pH 1.0, 0.1 mol L−1 TOMAC, 290 mL min−1 feed solution flow rate, 150 mL min−1 strip solution flow rate and 0.9 mol L−1 H2SO4 as strip solution. The parameters were also optimized for solvent extraction study. The number of stages and Aqueous:Organic (A:O) ratio for extraction and stripping were determined from McCabe–Thiele diagrams. The extracted species was determined to be (R3NCH3)2Ce(SO4)3. The selective separation of cerium in presence of various other metal ions such as iron, copper, zinc, cobalt, nickel and manganese using a hollow fiber supported liquid membrane (HFSLM) was carried out and the separation factor values were found to be in the order α Ce/Fe <αCe/Cu < αCe/Mn < αCe/Zn < αCe/Co < αCe/Ni. Finally highly pure (99.99%) CeO2 was prepared by stripping precipitation with oxalic acid and thermal decomposition at 900°C for 1 h. CONCLUSION The efficiency of hollow fiber supported liquid membrane was greater than that of solvent extraction for the extraction of cerium for the present system. © 2014 Society of Chemical Industry

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“…This problem is solved quite successfully by using chelating agents. Quite promising among them are diamides, and, in particular, N , N , N ′, N ′-tetraoctyl diglycolamide (TODGA), which can be used for extraction of a variety of rare earth elements and radioactive metals of the actinide family [ 1 , 2 , 3 ]. That is why one of the potential applications of TODGA is purification of waste water in the nuclear industry, removing radionuclides [ 2 , 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

“…That is why one of the potential applications of TODGA is purification of waste water in the nuclear industry, removing radionuclides [ 2 , 4 , 5 ]. TODGA is normally used as a solution in aliphatic hydrocarbons [ 3 , 4 , 5 ] but for many problems it is more convenient to use adsorbents impregnated by TODGA. Such materials can adsorb metals from acidic aqueous solutions, which allows them to be used in solid phase extraction and extraction of metals from complex mixtures.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of N,N,N′,N′-Tetraoctyl Diglycolamide on Hypercrosslinked Polysterene from a Supercritical Carbon Dioxide Medium

Kostenko

Паренаго

2021

Molecules

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The work considers for the first time the preparation of sorbents based on hypercrosslinked polysterene (HCP) and chelating agent N,N,N′,N′-tetraoctyldiglycolamide (TODGA) by impregnation in the supercritical (SC) CO2 medium. Such sorbents can be applied for further isolation and separation of lanthanides, actinides and other metals. They are usually prepared by impregnation in toxic organic solvents (e.g., methanol, dichloromethane). Our study shows that application of SC CO2 instead of organic solvents can significantly speed up the impregnation, perfom it in one stage and make the process more eco-friendly. At the same time, the obtained sorbents are close in their parameters to the classical ones. This article presents the results of measuring the TODGA adsorption isotherms on two HCP sorbents (MN202 and MN270) on a wide range of SC fluid parameters. Adsorption measurements were carried out using on-line supercritical fluid chromatography and gravimetry. Based on the sorption capacity parameter, MN202 sorbent was selected as the better carrier for TODGA. An impregnation temperature increase within the range 313–343 K in isochoric conditions (ρ = 0.780 g/mL) reduces the maximum of TODGA adsorption from ~0.68 mmol/g to ~0.49 mmol/g.

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Extraction behavior of cerium by tetraoctyldiglycolamide from nitric acid solutions

Cited by 12 publications

References 19 publications

The Effects of Nitric Acid on Extraction Properties of TODGA During Fission Product Management

The Effects of Nitric Acid on Extraction Properties of TODGA During Fission Product Management

Comparison of hollow fiber membrane and solvent extraction techniques for extraction of cerium and preparation of ceria by stripping precipitation

Adsorption of N,N,N′,N′-Tetraoctyl Diglycolamide on Hypercrosslinked Polysterene from a Supercritical Carbon Dioxide Medium

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