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Sharygin, L. M.; Muromskii, A. Yu.

doi:10.1023/a:1011303609753

Cited by 14 publications

(4 citation statements)

References 2 publications

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“…Sharygin’s Group investigated the sorption properties of Termosksid-35 a zirconium hydroxide support coated with K 2 Ni[Fe(CN) 6 ] (ion-exchanger content reaches up to 32%–36%, w / w ) [59,158,159]: they reported the strong stability of the composite materials at storage in terms of sorption properties and structure.…”

Section: Techniques For Immobilization Of Metal Hexacyanoferratesmentioning

confidence: 99%

Immobilization of Metal Hexacyanoferrate Ion-Exchangers for the Synthesis of Metal Ion Sorbents—A Mini-Review

2015

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Metal hexacyanoferrates are very efficient sorbents for the recovery of alkali and base metal ions (including radionuclides such as Cs). Generally produced by the direct reaction of metal salts with potassium hexacyanoferrate (the precursors), they are characterized by ion-exchange and structural properties that make then particularly selective for Cs(I), Rb(I) and Tl(I) recovery (based on their hydrated ionic radius consistent with the size of the ion-exchanger cage), though they can bind also base metals. The major drawback of these materials is associated to their nanometer or micrometer size that makes them difficult to recover in large-size continuous systems. For this reason many techniques have been designed for immobilizing these ion-exchangers in suitable matrices that can be organic (mainly polymers and biopolymers) or inorganic (mineral supports), carbon-based matrices. This immobilization may proceed by in situ synthesis or by entrapment/encapsulation. This mini-review reports some examples of hybrid materials synthesized for the immobilization of metal hexacyanoferrate, the different conditionings of these composite materials and, briefly, the parameters to take into account for their optimal design and facilitated use.

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Section: Techniques For Immobilization Of Metal Hexacyanoferratesmentioning

confidence: 99%

Immobilization of Metal Hexacyanoferrate Ion-Exchangers for the Synthesis of Metal Ion Sorbents—A Mini-Review

2015

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“…The following commercially available sorption materials were used in this work for comparison: FS-2-ferrocyanide sorbent with a Cu-K ferrocyanide content of 45-50 wt.% (ALLIANCE GAMMA Ltd., Moscow, Russia, produced under Technical Conditions 6-09-40-573-84) [4]; Termoksid-35-spherically granulated sorbent based on nickel ferrocyanide with a content of 32-36 wt.% of zirconium hydroxide support (Termoksid Ltd., Moscow, Russia, produced under Technical Conditions 6200-305-12 342 266-98) [41].…”

Section: Methodsmentioning

confidence: 99%

Removal of Cs-137 Radionuclide by Resorcinol–Formaldehyde Ion-Exchange Resins from Solutions Simulating Real Liquid Radioactive Waste

Tokar¹,

Tutov²,

Bratskaya³

et al. 2022

Molecules

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The efficiency of the removal of Cs-137 radionuclides with porous and non-porous resorcinol–formaldehyde resins from alkaline solutions simulating the composition of real liquid radioactive waste (LRW) streams has been evaluated. Resins were synthesized through the polycondensation of resorcinol and formaldehyde in an alkaline medium at a molar ratio of 1.8/2.2 and a temperature of 210 °C. The Cs-137 distribution coefficients on RFRs in alkaline solutions simulating LRW were above 103 mL/g under static sorption conditions. In a model solution with pH 11, the full dynamic sorption capacity of non-porous RFR was 0.178 mmol/g. The values of the full dynamic sorption capacities of porous RFRs were 0.274 and 1.035 mmol/g for resins obtained with calcium carbonate and toluene as templates, respectively. When the sizes of RFR beads increased two-fold, the volume until 5% cesium breakthrough decreased by 20–40%. The most pronounced beneficial effect of the RFR’s porosity was observed at flow rates from 25 to 50 BV/h. It was shown that the negative effect of metal cations on Cs-137 uptake increases in the following order: Na+ < Mg2+ < Ca2+ < K+. The number of bed volumes of LRW-simulating solution decontaminated with RFRs until 5% cesium breakthrough was above 450; that is higher than the value of known commercially available analogs. The latter shows that the developed RFRs are promising for application in technological schemes of alkaline LRW processing.

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“…Their selectivity was studied in numerous works [2][3][4][5][6][7][8]. Milyutin [9] reported the separation factors of the Cs + -Н + , Cs + -Na + , Cs + -Cа 2+ , and Cs + -Мg 2+ pairs for a wide range of inorganic sorbents including several kinds of ferrocyanides.…”

Section: Abstract: Sorption Cesium Ferrocyanide Specificity Selecmentioning

confidence: 99%

“…Their selectivity was studied in numerous works [2][3][4][5][6][7][8]. Milyutin [9] Because of the revealed effect of NH 4 + on the Cs + recovery with the sorbent, the sorbent specificity to Cs + was additionally studied in a wider range of NH 4 + concentrations (up to 2 M) and at different Cs + concentrations (without isotopic carrier and at Cs + concentrations of 10 -3 and 100 mg L -1 ).…”

Section: Abstract: Sorption Cesium Ferrocyanide Specificity Selecmentioning

confidence: 99%

Influence of the concentrations of potassium, sodium, and ammonium ions on the cesium sorption with mixed nickel potassium ferrocyanide sorbent based on hydrated titanium dioxide

Воронина

Семенищев

2013

Radiochemistry

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Abstract-The effect of single-charged cations (Na + , K + , NH 4 + ) on the cesium sorption with mixed nickel potassium ferrocyanide sorbent based on hydrated TiO 2 was studied. The K + and Na + ions exert no effect at their concentrations of up to 0.5 M; the Cs + distribution coefficients from KCl and NaCl solutions are (1.1 ± 0.5) × 10 5 and (8 ± 3) × 10 4 mL g -1, respectively. The sorbent is highly specific to Cs + in the presence of ammonium ions. The sorption mechanisms were studied. The concentration ranges in which Cs + and NH 4 + are sorbed by independent mechanisms (Cs + , by the ferrocyanide phase; NH 4 + , by the phase of hydrated TiO 2 ) and in which the Cs + distribution coefficient decreases owing to competitive filling of the ferrocyanide phase with ammonium ions were determined. At cesium concentrations in solution exceeding 50 mg L -1 , Cs + and NH 4 + are absorbed jointly owing to coprecipitation in the mixed ferrocyanide phase in the pore space of the sorbent. Keywords: sorption, cesium, ferrocyanide, specificity, selectivity, mechanismOne of the objectives of modern chemical technology is preparation of selective sorbents capable to recover microcomponents from multicomponent salt solutions (natural or artificial) with the aim, on the one hand, to concentrate and subsequently use the valuable components of the solution and, on the other hand, e.g., to purify natural waters to the environmentally safe level without affecting their salt composition. This problem is also topical for radiochemical technology, namely, for treatment of highly saline liquid radioactive wastes and for recovery of useful individual radionuclides from multicomponent solutions. Therefore, study of the selectivity of the radionuclide sorption is of interest for the development of new sorbents.The best sorbents for cesium recovery are transition metal ferrocyanides [1]. Their selectivity was studied in numerous works [2][3][4][5][6][7][8]. Milyutin [9] reported the separation factors of the Cs + -Н + , Cs + -Na + , Cs + -Cа 2+ , and Cs + -Мg 2+ pairs for a wide range of inorganic sorbents including several kinds of ferrocyanides. It was shown that the Cs + sorption with transition metal ferrocyanides is not quite selective and that the selectivity of ferrocyanide sorbents depends on the procedure of their preparation (precipitation followed by granulation, impregnation, preparation of composite sorbents, chemical deposition onto a support). The majority of published papers dealt with the Cs + sorption from solutions containing Na + ions. Data on the selectivity of the Cs + sorption with ferrocyanides in the presence of K + and NH 4 + ions are virtually lacking, despite the fact that specifically these ions will exert the strongest effect on the Cs + sorption because of the closeness of their ionic radii to that of Cs + . The affinity series for ferrocyanides can be presented as Na + < K + < NH 4 + .This study deals with the influence of the K + , Na + , and NH 4 + concentrations on the sorption of Cs + with mixed nickel...

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Untitled

Cited by 14 publications

References 2 publications

Immobilization of Metal Hexacyanoferrate Ion-Exchangers for the Synthesis of Metal Ion Sorbents—A Mini-Review

Immobilization of Metal Hexacyanoferrate Ion-Exchangers for the Synthesis of Metal Ion Sorbents—A Mini-Review

Removal of Cs-137 Radionuclide by Resorcinol–Formaldehyde Ion-Exchange Resins from Solutions Simulating Real Liquid Radioactive Waste

Influence of the concentrations of potassium, sodium, and ammonium ions on the cesium sorption with mixed nickel potassium ferrocyanide sorbent based on hydrated titanium dioxide

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