Sorption of technetium on inorganic sorbents and natural minerals

El-Wear, S.; German, K. É.; Peretrukhin, V.F.

doi:10.1007/bf02039772

Cited by 31 publications

(40 citation statements)

References 13 publications

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“…Considerable Tc accumulation by some sulfide minerals and rocks have been observed [11][12][13], the most effective sorbents being the sulfides with higher solubility or those possessing reducing metal ions. The mechanism for Tc removal is differed for various minerals [13].…”

Section: Introductionmentioning

confidence: 99%

“…The Tc 2 S 7 solubility was investigated based on the measurements of Tc concentration in the aqueous solutions equilibrated with the previously precipitated and washed technetium sulfide [13]. No permanent thermodynamic solubility value were established because of technetium sulfide peptisation followed by dissolution and slow oxidation in course of its dissolution in distilled water [3,4,13] and references therein.…”

Section: Introductionmentioning

confidence: 99%

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Technetium sulfide – formation kinetics, structure and particle speciation

German¹,

Shiryaev

Safonov³

et al. 2015

Radiochimica Acta

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Technetium sulfide formation kinetics was studied in the pH range 8−12 in presence of Na 2 S and phosphate buffer solution. The conditions for separation of Tc sulfide micro and nanoparticles were found with ultramicrocentifugation and the values of Tc sulfide solubility were demonstrated to be dependent on the Na 2 S concentration as (Tc 3 S 10+x ) = −9 × 10 −5 ln [Na 2 S]−2 × 10 −5 M. The composition of Tc sulfide precipitate was elucidated with EXAFS, RBS and chemical analyses as Tc 3 S 10+x or [Tc 3 ( 3 -S)(S 2 ) 3 (S 2 ) 3/3 ] n in agreement with recent Lukens data.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Technetium sulfide – formation kinetics, structure and particle speciation

German¹,

Shiryaev

Safonov³

et al. 2015

Radiochimica Acta

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“…TOPO was shown to be the best extractant among the tested ones, with Rs equal to 10.5 mg/L from the simulated alkaline radioactive waste solution. For this type of solution much better results have been obtained with anion exchanger VPT-A (macro-pore structure, it contains two types of ion-exchanger groups: pyridinium and sulphohydrylic) [2]. The R s value of TOPO is not high enough for working out a separation technique of Tc from an alkaline solution.…”

Section: Resultsmentioning

confidence: 93%

Extraction chromatography of technetium-99 by TOPO supported on Chromosorb from aqueous solution

Elwaer

2003

Czech J Phys

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The batch experiment has been carried out to determine the possibility of using extractants supported by several inert carders for sorption of technetium(VII) from different aqueous solutions. Several extractants with considerably low solubility in aqueous solution have been investigated. Solubility of TBP in water is 0.4 g/L, the solubility of TOPO is lower, 1.5 mg/L, and it has a negative temperature coefficient [1]. The extractants were dissolved in cyclohexanone and known amount was dried together with the supporting inert grains chosen as the bed material, proved to be poor sorbents for technetium (Polisorb-1, Chromosorb W, etc., of 45 -60 mesh). The prepared sorbent was contacted with the technetium solution of different composition (Vsu p = 1 mL, Vextr = 0.05 mL, Czc = 10 mg/L). The alkaline solution was chosen to simulate the typical radioactive wastes CNaNO 3 = 200 g/L, [NaOH] = 16 g/L, [Na2CO3] = 6 g/L, [All = 3 g/L.

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“…As in the case of Re, the contact of the resin with pH nonbuffered Tc(VII) solutions of different initial pH (3)(4)(5)(6)(7)(8)(9)(10)(11) also leads to a shift in pH again highlighting the buffering capacity of the resin. The pH equil of these non-buffered Fig.…”

Section: Sorption Of Tc(vii)mentioning

confidence: 94%

“…A number of raw and modified natural [9][10][11][12][13][14][15][16] as well as synthetic materials [17][18][19][20][21][22][23][24][25][26][27][28][29] have already been investigated as technetium and rhenium sorbents and extractants from aqueous solutions. Biomaterials and modified biomaterials were also studied for the removal of Re(VII) from waters [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Rhenium(VII) and technetium(VII) separation from aqueous solutions using a polyethylenimine–epichlorohydrin resin

Sarri

Μisaelides

Zamboulis

et al. 2015

J Radioanal Nucl Chem

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The ReO 4 -and 99 TcO 4 -removal from aqueous solutions using a polyethylenimine-epichlorohydrin resin was investigated in absence and presence of background electrolyte (0.01 and 0.50 M NaCl). Re(VII) and Tc(VII) sorption isotherms were obtained for solutions with 2.3 B pH B 8.9 and concentration 0.21-26.9 mmol Re/L and 5 9 10 -3 -5 9 10 -2 mmol 99 Tc/L. The highest uptake for both elements (R d & 10 4 mL/g) was observed for solutions with pH B 4 and C NaCl B 0.01 M, hinting towards the existence of protonated groups contributing to the sorption of anions under acidic conditions and to the competition of Cl -. The sorption data were modeled using the Langmuir and Freundlich equations.

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Sorption of technetium on inorganic sorbents and natural minerals

Cited by 31 publications

References 13 publications

Technetium sulfide – formation kinetics, structure and particle speciation

Technetium sulfide – formation kinetics, structure and particle speciation

Extraction chromatography of technetium-99 by TOPO supported on Chromosorb from aqueous solution

Rhenium(VII) and technetium(VII) separation from aqueous solutions using a polyethylenimine–epichlorohydrin resin

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