Authors:
Chong-Hun Jung Decontamination and Decommissioning Technology Development Division, Korea Atomic Energy Research Institute, 1054 Daedeokdaero, Yuseong Gu, DaeJeon, 305-353 Korea

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Hye-Young Lee Department of Chemical & Biomolecular Engineering, Yon Sei University, 262 Seongsanno, Seodaemun-Gu, 120-749 Seoul, Korea

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Jei-Kwon Moon Decontamination and Decommissioning Technology Development Division, Korea Atomic Energy Research Institute, 1054 Daedeokdaero, Yuseong Gu, DaeJeon, 305-353 Korea

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Hui-Jun Won Decontamination and Decommissioning Technology Development Division, Korea Atomic Energy Research Institute, 1054 Daedeokdaero, Yuseong Gu, DaeJeon, 305-353 Korea

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Yong-Gun Shul Department of Chemical & Biomolecular Engineering, Yon Sei University, 262 Seongsanno, Seodaemun-Gu, 120-749 Seoul, Korea

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Abstract  

A study on the electrosorption of uranium (U(VI)) ions onto a porous activated carbon fiber was performed to treat lagoon sludge containing 100 mg/L uranium and high concentration of chemical salts composed 3.8% NaNO3, 19.8% NH4NO3, 1.9% Ca(NO3)2. The applied negative potential increased the adsorption kinetics and capacity in comparison to the open-circuit potential adsorption for uranium ions. When applying potential at −0.9 V (vs. Ag/AgCl) and pH 4, above 99% of the uranium is selectively removed from the 100 mg/L influent by electrosorption, and the cumulative amount of uranium for 50 h is about 600 mguranium/gACF. The high selectivity of elctrosorption process for uranium was probably caused by the difference of charge density of cations. More than 99% of adsorbed uranium ions was desorbed at a potential of +1.2 V and pH 3. The electrosorption of uranium onto the porous activated carbon fiber electrode is due to an ion exchange type reaction between the uranium ions and surface acid groups on carbon surface. Cyclic electrosorption test consisting of adsorption and desorption step shows that the activated carbon fiber electrode is easily regenerated in situ, indicating it is a reversible process.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)