Development and practical evaluation of the scheme for 137Cs concentrating from seawater using chitosan and mixed ferrocyanides of Zn-K and Ni-K

Tokar, Eduard; Zemskova, L. A.; Tutov, M. V.; Тананаев, И. Г.; Dovhyi, I. I.; Egorin, Andrei

doi:10.1007/s10967-020-07248-9

Cited by 8 publications

(11 citation statements)

References 29 publications

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“…Cesium ion sorption on ferrocyanides is usually irreversible [ 12 ], although efficient cesium elution was reported in exceptional cases for mixed ferrocyanides [ 25 ]. Figure S5 (Supplementary Materials) that only about 25% of cesium was eluted with NaOH solution from the PEI/ZnFC cryogel fabricated via Method I at volumetric ratio eluent/column bed of 18.…”

Section: Resultsmentioning

confidence: 99%

Composite Zn(II) Ferrocyanide/Polyethylenimine Cryogels for Point-of-Use Selective Removal of Cs-137 Radionuclides

et al. 2021

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The feasibility of several approaches to the fabrication of monolith composite cryogels containing transition-metal ferrocyanides for Cs+ ion uptake has been evaluated. Although in the series of investigated metal ion precursors (Cu(II), Zn(II), Ni(II), and Co(II)), in situ formation of the sorption active phase in polyethyleneimine (PEI) cryogel was feasible only in the case of Zn(II) ferrocyanide, this approach has shown significant advantages over the immobilization of ex situ synthesized ferrocyanide nanoparticles. Nanoparticles of the mixed ferrocyanide Zn1.85K0.33[Fe(CN)6] formed in situ had an average size of 516 ± 146 nm and were homogeneously distributed in the monolith located at the polymer surface rather than embedded in the matrix. The Young modulus of the PEI cryogel increased after modification from 25 to 57 kPa, but composites maintained high permeability to the flow. Sorption of Cs+ ions has been investigated at superficial velocity up to 8 m/h. Steep breakthrough profiles and uptake efficiency of >99.5% until breakthrough point confirmed that a supermacroporous structure of the monolith composite assured good mass transfer, so that intraparticle diffusion was not the limiting stage of sorption kinetics. Application of the rate-constant distribution model (RCD model) to analyze the breakthrough curves of Cs+ sorption allowed the identification of two types of sorption sites with a difference in sorption rate constants of ~1 log unit. Most likely, sorption on “fast” sorption sites was governed by ion exchange between Cs+ ions in solution and K+ ions in the ferrocyanide lattice. Cs-137 radionuclide removal was investigated using the monolith composite columns of various geometries at superficial velocity up to the 6.6 m/h; specific gamma activity was reduced from 265 kBq/L to the background level, showing high potential of these materials for POU application.

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Section: Resultsmentioning

confidence: 99%

Composite Zn(II) Ferrocyanide/Polyethylenimine Cryogels for Point-of-Use Selective Removal of Cs-137 Radionuclides

et al. 2021

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“…В 2014 г. объёмная активность 137 Cs в прибрежной и центральной частях Японского моря составляла 4,2 и 5,0 Бк•м −3 соответственно [1]. По данным исследований 2018 г., значения объёмной активности 137 Cs в северо-западной части Японского моря находились в пределах от (2,1 ± 0,4) до (7,8 ± 1,1) Бк•м −3 [22]. Кроме того, зафиксировано относительно высокое содержание 137 Cs в прибрежной акватории, прилегающей к бухте Чажма [(46,0 ± 3,4) Бк•м −3 ], что объясняется последствиями взрыва на атомной подводной лодке К-431 в 1985 г.…”

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“…Кроме того, зафиксировано относительно высокое содержание 137 Cs в прибрежной акватории, прилегающей к бухте Чажма [(46,0 ± 3,4) Бк•м −3 ], что объясняется последствиями взрыва на атомной подводной лодке К-431 в 1985 г. [22]. Таким образом, после аварии на АЭС «Фукусима-1» объёмная активность 137 Cs к 2014 г. увеличилась в два раза и к 2018 г. практически не изменилась.…”

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“…Наши исследования подтверждают данный вывод. Стоит отметить, что, по результатам определения объёмной активности 137 Cs, полученным в 2018 г. другой группой исследователей, в южной части Охотского моря зарегистрированы концентрации от (1,2 ± 0,5) до (38,3 ± 3,5) Бк•м −3 [22]. Авторы объясняют наличие относительно высоких значений содержания 137 Cs в поверхностных водах данного региона последствиями аварии на АЭС «Фукусима-1», однако очевидно, что этот факт требует дальнейших, более детальных исследований.…”

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“…Результаты исследований 2018 г. [22] показали, что значения объёмной активности 137 Cs в поверхностных водах около п-ва Камчатка находились в диапазоне от (3,2 ± 0,8) до (12,2 ± 2,4) Бк•м −3 . В Беринговом море средняя концентрация 137 Cs в прибрежных водах составила (1,85 ± 0,1) Бк•м −3 (ст.…”

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Оценка содержания 137Cs в поверхностных водах дальневосточных морей по результатам экспедиционных исследований 2018 года

Мирошниченко

Параскив

2020

mbj

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Based on the results of expeditionary research carried out during the 82nd cruise of the RV “Akademik M. A. Lavrentyev” (01.06.2018–20.07.2020), the assessment of current levels of concentration activity of technogenic radionuclide 137Cs in surface waters of Far Eastern seas is given. The studies were carried out in the northwestern part of the Sea of Japan, the southern part of the Sea of Okhotsk, the coastal waters of the Pacific Ocean near the Kamchatka Peninsula, and the western part of the Bering Sea. Activity of 137Cs in seawater samples was determined by sorption method using two series-connected adsorbers with subsequent measurement of 137Cs content via its gamma-emitting daughter radionuclide 137mBa. Sorption efficiency was assessed by the difference in activity on the first and second adsorbers. A comparative analysis of contamination levels of water areas studied was made. It was revealed that 137Cs volumetric activity in surface water of the Sea of Japan varied from (2.9 ± 0.1) to (5.1 ± 0.3) Bq·m−3, in the Sea of Okhotsk – from (1.8 ± 0.1) to (2.3 ± 0.1) Bq·m−3, and in the Bering Sea – from (1.7 ± 0.1) to (3.1 ± 0.1) Bq·m−3. The maximum 137Cs concentrations were registered in the Sea of Japan, which might be due to its isolation from other water areas and presence of secondary sources of radionuclide intake. In general, contamination of adjacent water areas is insignificant, and fluctuations in concentrations occur within technogenic isotopes global background in the marginal seas of the Pacific Ocean.

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Study of sorbents for analysis of radiocesium in seawater samples by one-column method

Bezhin

Dovhyi

Milyutin

et al. 2021

J Radioanal Nucl Chem

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Development and practical evaluation of the scheme for 137Cs concentrating from seawater using chitosan and mixed ferrocyanides of Zn-K and Ni-K

Cited by 8 publications

References 29 publications

Composite Zn(II) Ferrocyanide/Polyethylenimine Cryogels for Point-of-Use Selective Removal of Cs-137 Radionuclides

Composite Zn(II) Ferrocyanide/Polyethylenimine Cryogels for Point-of-Use Selective Removal of Cs-137 Radionuclides

Оценка содержания 137Cs в поверхностных водах дальневосточных морей по результатам экспедиционных исследований 2018 года

Study of sorbents for analysis of radiocesium in seawater samples by one-column method

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