Coprecipitation of microamounts of cesium with precipitates of transition metal ferrocyanides in alkaline solutions

Milyutin, V. V.; Mikheev, S. V.; Gelis, V. M.; Kononenko, O. A.

doi:10.1134/s106636220903014x

Cited by 17 publications

(9 citation statements)

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“…Considering that reported K d values for PB and PB analogue adsorbents in batch mode are in the range of 10 3 to 10 6 mL/g, depending on the hetero metal M in [M x Fe 1−x (CN) 6 ] y− and on the support bead material (silica, alumina, polymers etc.) 13 , 19 , 20 , 25 – 28 , 31 , 38 , 43 – 45 , the K d value of the present co-precipitation method is remarkably high, which is due to precipitation and aggregation effect of DND in co-precipitation mode. Co-precipitation effect gives often better removal efficiency than batch mode.…”

Section: Resultsmentioning

confidence: 81%

“…4 , these DND peaks are not observed, maybe because only the thin surface layer of Cu-PB in Cu-PB@DND contributes to the X-ray diffracrion pattern. Similarly, only PB X-ray diffraction peaks are observed in other PB modified CNT, graphene and graphene oxide, for Cs + adsorption 28 , 38 , 44 . Existence of DND in Cu-PB@DND has been proved in the IR spectrum in Fig.…”

Section: Resultsmentioning

confidence: 94%

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A Highly Efficient Adsorbent Cu-Perusian Blue@Nanodiamond for Cesium in Diluted Artificial Seawater and Soil-Treated Wastewater

Matsumoto

Yamato²,

Kakimoto

et al. 2018

Sci Rep

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A new adsorbent Cu-Perussian blue@Nanodiamond (Cu-PB@DND) for Cs+ removal was prepared and characterized with IR, SEM, X-ray diffraction, particle size analysis, and zeta-potential. The adsorbent consists of a core of aggregated detonation nanodiamond (DND) particles with the surface treated with Cu-PB. Cesium adsorption was studied in two modes; a co-precipitation mode and a batch mode. In the co-precipitation mode, DND, CuCl2, and K4[Fe(CN)6] were added sequentially to a Cs+ solution in diluted artificial seawater. In the batch mode, adsorbent Cu-PB@DND was dispersed into a Cs+ solution with stirring. The distribution coefficient (Kd) of the co-precipitation mode was 8.8 × 107 (mL/g) at Cs+ 6.6 ppm in 0.07% seawater. The Kd value of the batch mode was 1.3 × 106 (mL/g). Precipitation of Cs+-incorporated particles was complete, and post filtration was not necessary. Excess copper and iron ions were completely removed and were not detected in the supernatant. The adsorption data for Cu-PB@DND were analyzed by assuming Langmuir isotherm and a good fit was obtained with a maximum adsorption capacity Qmax of 759 mg/g. The co-precipitation method was also applied to soil-treated wastewater.

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Section: Resultsmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 94%

A Highly Efficient Adsorbent Cu-Perusian Blue@Nanodiamond for Cesium in Diluted Artificial Seawater and Soil-Treated Wastewater

Matsumoto

Yamato²,

Kakimoto

et al. 2018

Sci Rep

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“…In opposite, the nickel excess promotes the formation of the nickel-potassium ferrocyanide phase stable to dissolution and characterized with high Ni 2+ /Fe(CN) 6 4− ratio [23]. Besides, addition of an excess of nickel into alkaline solution of potassium ferrocyanide promotes the formation of a mixed phase of nickel ferrocyanide with nickel hydroxide with high sorption-selective parameters [20].…”

Section: Resultsmentioning

confidence: 98%

“…The Cs-137 content was determined by direct radiometry method using an Aspekt-1S gamma-spectrometer with Termoxid-35 is known to be stable in the pH range 7.0-11.6, whereas its decomposition in highly alkaline media is caused by dissolution of nickel ferrocyanide [19] accompanied with formation of free Fe(CN) 6 4− ions and the phase of nickel hydroxide [20]. One can assume that decomposition of CFS(2) is also related exclusively to dissolution of the sorption-active component.…”

Section: Methodsmentioning

confidence: 99%

Chitosan-ferrocyanide sorbent for Cs-137 removal from mineralized alkaline media

2016

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An organomineral sorbent based on mixed nickel-potassium ferrocyanide and chitosan to be used in removal of Cs-137 radionuclide from highly mineralized media with high pH has been fabricated. The synthesized sorbent was applied to remove Cs-137 from model solutions under static and dynamic conditions. The effects of contact time, pH, and presence of sodium ions and complexing agents in the process of Cs-137 removal have been investigated. The sorbent is distinguished by increased stability to the impact of alkaline media containing complexing agents, whereas the sorbent capacity in solutions with pH 11 exceeds 1000 bed volumes with the Cs-137 removal efficiency higher than 95%.

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“…For selective removal of Cs-137, two main groups of materials are widely used: Granulated and composite transition metal (Ni, Co, Cu) ferrocyanides [7][8][9] and resorcinol-formaldehyde resins (RF-resins) [10,11] related to the phenol-formaldehyde thermoreactive group of resol-type polymers. The main disadvantage of transition metal ferrocyanide sorbents is a low chemical stability in alkaline media [12,13], which results in fast degradation of the materials. Resorcinol-formaldehyde resins are characterized with greater chemical stability to alkaline solutions and can selectively remove Rb and Cs at high background concentrations of Na + [14].…”

Section: Introductionmentioning

confidence: 99%

Porous Resorcinol-Formaldehyde Resins

Egorin

Tokar

Tutov

et al. 2018

Colloids and Interfaces

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Porous ion-exchanging resorcinol-formaldehyde resins were prepared by removing an inorganic template (CaCO3) and by polymerization of a highly concentrated emulsion with toluene as a dispersing phase. As compared to original resorcinol-formaldehyde resins, the porous one is characterized with higher values of internal diffusion, providing exceptional purification coefficients. However, the amounts of the introduced CaCO3 and toluene have to be below 10 wt.% and 25 wt.%, respectively, to avoid fast degradation of the ion-exchanger. Under dynamic conditions, average purification coefficients in the model solution of Cs-137 are twice higher than those of the non-porous sample. The prepared porous ion-exchange resin can be used in cases when high Cs-137 uptake from liquid media should be realized at increased rates of solution percolation.

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Coprecipitation of microamounts of cesium with precipitates of transition metal ferrocyanides in alkaline solutions

Cited by 17 publications

References 0 publications

A Highly Efficient Adsorbent Cu-Perusian Blue@Nanodiamond for Cesium in Diluted Artificial Seawater and Soil-Treated Wastewater

A Highly Efficient Adsorbent Cu-Perusian Blue@Nanodiamond for Cesium in Diluted Artificial Seawater and Soil-Treated Wastewater

Chitosan-ferrocyanide sorbent for Cs-137 removal from mineralized alkaline media

Porous Resorcinol-Formaldehyde Resins

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