MnO2 fiber as a sorbent for radionuclides in oceanographic investigations

Dovhyi, I. I.; Kremenchutskii, D. A.; Bezhin, N. A.; Shibetskaya, Yu. G.; Tovarchii, Ya. Yu.; Egorin, Andrei; Tokar, Eduard; Тананаев, И. Г.

doi:10.1007/s10967-019-06940-9

Cited by 10 publications

(7 citation statements)

References 24 publications

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“…During the preliminary preparation of PAN fiber, additional ion exchange groups (carboxyl, carbonyl, etc.) are formed, which is confirmed by the IR spectra given in [45,46]. This increases the amount of ferrocyanide mounted onto the support at the next stages of sorbent production.…”

Section: Methods Of Support Preparationsupporting

confidence: 58%

“…Preliminary preparation of the initial PAN fiber was carried out using two methods, by precipitating iron(III) hydroxide with ammonia on pre-hydrolyzed PAN (converting PAN to the form PAN-Fe(OH) 3 ) and by treating it with potassium permanganate (converting PAN to the form PAN-MnO 2 ). These techniques and the conditions for their implementation are described in detail in our previous works, presented in [45,46], respectively.…”

Section: Methods Of Support Preparationmentioning

confidence: 99%

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New Sorbents Based on Polyacrylonitrile Fiber and Transition Metal Ferrocyanides for 137Cs Recovery from Various Composition Solutions

Shibetskaia,

Razina,

Bezhin

et al. 2024

Applied Sciences

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For the first time, new sorbents based on polyacrylonitrile (PAN) fiber and transition metal ferrocyanides were obtained. The main difference between the obtained sorbents and the existing ones is the stage of preliminary preparation of the initial support by converting it into the forms PAN-Fe(OH)3 or PAN-MnO2, due to which additional ion exchange groups (carboxyl, carbonyl, etc.) are formed, which increases the amount of ferrocyanide fixed to the support. The best components and conditions for the synthesis of new sorbents were determined (concentration (0.1–0.2 mol/L), as well as pH (1 for sorbents based on PAN-Fe(OH)3, and 1–5—PAN-MnO2) of potassium ferrocyanide solution, concentration of transition metal salts (0.02 mol/L), temperature conditions). The influence of the studied solution composition (pH, concentration of Na+, K+, NH4+ ions) on the cesium distribution coefficients during its recovery by the obtained sorbents was assessed. The possibility of cesium recovery from solutions with pH 1–9 containing macro quantities of cations was demonstrated. The sorbents derived were characterized by modern structural methods such as infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy with EDS analysis. A study of the trace amount sorption of 137Cs was carried out in comparison with commercially available highly efficient sorbents (FNS-10 and Termoksid-35), and it was shown that the resulting sorbents are not inferior to industrial ferrocyanide sorbents and can be used for 137Cs selective sorption from technological solutions and natural waters.

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Section: Methods Of Support Preparationsupporting

confidence: 58%

Section: Methods Of Support Preparationmentioning

confidence: 99%

New Sorbents Based on Polyacrylonitrile Fiber and Transition Metal Ferrocyanides for 137Cs Recovery from Various Composition Solutions

Shibetskaia,

Razina,

Bezhin

et al. 2024

Applied Sciences

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“…Fresh 226 Ra and 228 Ra isotopes were extracted according to the procedure described in [19] using our own output fiber based on MnO 2 . When extracting from samples with a volume of 200 L, two columns with a fiber mass of 5 g were used; from samples with a volume of 1 m 3 , two columns with a fiber mass of 20 g were used.…”

Section: Methodsmentioning

confidence: 99%

“…When extracting from samples with a volume of 200 L, two columns with a fiber mass of 5 g were used; from samples with a volume of 1 m 3 , two columns with a fiber mass of 20 g were used. The degree of 226 Ra and 228 Ra extraction was calculated according to the following formula [19]:…”

Section: Methodsmentioning

confidence: 99%

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Studying Submarine Groundwater Discharge at the Cape Ayia: a Multi-Tracer Approach

Dovhyi¹,

Bezhin²,

Kremenchutskii³

et al. 2021

PhO

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Purpose. The study of submarine groundwater discharge is one of the most pressing issues of modern hydrogeology and oceanography. The purpose of the paper is to provide a comprehensive study of the submarine groundwater discharge at Cape Ayia using the hydrological, hydrochemical and radiochemical methods, and to determine the flux of submarine groundwater including the nutrients. Methods and Results. The research werecarried out during the coastal expeditions nearby Cape Ayia on March 24, 2019, and on April 22–24, 2019 during the 106th RV “Professor Vodyanitsky” cruise (April 18 – May 13, 2019). The isotopes 226Ra, 228Ra were extracted using the proprietary MnO2-based fibers. After concentration, the sorbent was squeezed to remove excess water, dried and ashed. Then the ash was placed in the Petri dishes and poured with epoxy resin. Activity of the radionuclides was measured on a low-background semiconductor γ-spectrometer with a detector of high-purity germanium (GC3020) 3 weeks after the resin casting. The activity of 226Ra was determined by the daughter radionuclide 214Pb with the energy 351.9 keV (qγ = 37.2 %), and that of 228Ra – by the daughter 228Ac (T1/2 = 6.1 h, qγ = 27.7 %) with the energy 911.6 keV. The basic elements of the main nutrient cycle were determined photocolorimetrically: mineral phosphorus – by molybdenum blue, silicon – by silicon-molybdenum complex. Nitrates (reduced to nitrites) and nitrites were determined by azo dye; ammonium – by indophenol blue also by the photocolorimetric method. Conclusions. Distribution of hydrophysical, hydrochemical and radiochemical parameters in the water area connected with the known submarine groundwater discharges was studied. The distribution of the 226Ra, 228Ra isotopes was studied for the first time. The data on salinity, specific activity of 226Ra, 228Ra and the nutrients concentration permitted to determine the flows of submarine groundwaters in the Cape Ayia area, which amounted to 8220 ± 1200 m3/day. The anthropogenic contribution to pollution of the groundwater forming the submarine sources is shown.

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