Behavior of Alkali Metal and Ammonium Salts in Nanofiltration of Their Aqueous Solutions

Kaptakov, V. O.; Milyutin, V. V.; Некрасова, Н. А.

doi:10.1134/s1066362219020127

Cited by 6 publications

(2 citation statements)

References 5 publications

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“…In the experiments, we used a nanofi ltration polymer membrane of NanoNF-1812 grade produced by the company "RM Nanotech" (Vladimir, Russia), with an eff ective fi ltration area of 0.3 m 2 . The characteristics of the membrane and a description of the laboratory setup are given in [9][10][11][12].…”

Section: Methodological Partmentioning

confidence: 99%

“…In our previous works [9][10][11][12], in experiments on model solutions, it was shown that the NF method is very eff ective for the retention of multiply charged ions of transition metals, uranium, thorium, radionuclides of strontium, cobalt, europium, plutonium, organic complexing agents and surfactants. The main feature of the NF membrane is its low retention capacity for singly charged alkali metal ions, which makes it possible to separate the main inactive salt component of liquid radioactive waste of low and medium activity levels-sodium nitrate-from multiply charged active and inactive components [9,10]. The results obtained on model solutions showed the high promise of the NF method for reprocessing of real low-and medium-level liquid radioactive waste.…”

Section: Introductionmentioning

confidence: 99%

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Nanofiltration Purification of Liquid Radioactive Waste

Kaptakov,

Milyutin

2023

Radiochemistry

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The paper presents the results of testing the purification of real liquid radioactive waste from radionuclides, bottom residues of the Kola and Beloyarsk nuclear power plants (NPP), as well as low-level wastewater from the radiochemical building of the Institute of Physical Chemistry and Electrochemistry RAS (IPCE RAS) using the method of nanofiltration (NF) using a polymer membrane manufactured by the Russian company “RM Nanotech.” It has been shown that in the case of single-stage NF purification of bottoms of the Kola NPP, the coefficient of purification from 60Co is 2.8, while no purification from 137Cs practically occurs. When cleaning the bottom residues of the Beloyarsk NPP from 60Co using a five-stage scheme, a coefficient of purification from 60Co equal to 388 was obtained. The combination of nanofiltration purification and selective sorption of cesium on the ferrocyanide sorbent Temoksid-35 makes it possible to obtain a dry salt residue that is not related to radioactive waste. When using the method of nanofiltration for the treatment of low-level wastewater of the Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences, the degree of purification was, %: 137Сs ~ 75; 90Sr ~ 91; 241Am ~ 99.5; 152Eu ~ 91; 239Pu ~ 99.5.

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Section: Methodological Partmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nanofiltration Purification of Liquid Radioactive Waste

Kaptakov,

Milyutin

2023

Radiochemistry

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Strategies for Improving Solubility of Redox‐Active Organic Species in Aqueous Redox Flow Batteries: A Review

Wang

Gautam

Jiang

2022

Batteries & Supercaps

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Redox flow batteries (RFB) have emerged as one of the most promising technologies for large-scale energy storage owing to their high safety, long operation life, and decoupled design of energy and power. However, the problems of high cost and low energy density restrict their further development. The cost merit and tunable structure of organic redox-active materials have prompted the development of organic RFBs. The solubility of the redoxmer is recognized as a parameter that contributes directly to the energy density. Herein, we focus on strategies for enhancing the solubility of organic redoxmers in aqueous RFBs. The effects of incorporating different hydrophilic functional groups on the solubility of the redoxmer and its effect on the performance of other batteries are systematically and exhaustively described. Other strategies, such as molecular symmetry tuning and employing more soluble counterions and cosolvents, are also summarized. The development trends and prospects for organic RFBs are also discussed.

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