Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Radionuclide Removal from Aqueous Solutions by Oxidized Carbon Fabrics

Ioannis Ioannidis
* ORCID logo ,
Ioannis Pashalidis
,
Batuhan Mulla
,
Gkerman Kotanidis
,
Kyriacos Ioannou
,
Georgios Constantinides
ORCID logo ,
Nikolaos Kostoglou
ORCID logo ,
Claus Rebholz
*
Version 1 : Received: 10 November 2023 / Approved: 12 November 2023 / Online: 13 November 2023 (11:06:50 CET)

A peer-reviewed article of this Preprint also exists.

Ioannidis, I.; Pashalidis, I.; Mulla, B.; Kotanidis, G.; Ioannou, K.; Constantinides, G.; Kostoglou, N.; Rebholz, C. Radionuclide Removal from Aqueous Solutions Using Oxidized Carbon Fabrics. Materials 2023, 16, 7479. Ioannidis, I.; Pashalidis, I.; Mulla, B.; Kotanidis, G.; Ioannou, K.; Constantinides, G.; Kostoglou, N.; Rebholz, C. Radionuclide Removal from Aqueous Solutions Using Oxidized Carbon Fabrics. Materials 2023, 16, 7479.

Abstract

The adsorption of actinide ions (Am(III) and U(VI)) from aqueous solutions by pristine and oxidized carbon fabrics has been investigated by means of batch experiments at different pH values (4, 7 and 9) and temperatures (25, 35 and 45 °C) under ambient atmospheric conditions. The experimental results indicate that both pH and fabric texture affect the adsorption rate and the relative removal efficiency, which results at 70% and 100% for Am(III) and U(VI), respectively. The Kd (L/kg) values for U(VI) have been generally found to be higher (2 < log10(Kd)< 3) than the corresponding values for the Am(III) adsorption (1.5 < log10(Kd) < 2). The data obtained from the experiments regarding the temperature effect imply that the relative adsorption for both actinides increases with temperature and that the adsorption is an endothermic and entropy-driven reaction. Application of the fabrics to remove the two actinides from contaminated seawater samples shows that both the relative removal efficiency and the Kd values decrease significantly due to the presence of competitive cations (e.g., Ca2+ and Fe3+) and complexing anions (CO32-) in the respective waters. Nevertheless, the removal efficiency is still remarkable (50% and 90% for Am(III) and U(VI), respectively), demonstrating that these materials could be attractive candidates for the treatment of radionuclide/actinide contaminated waters.

Keywords

U-232; Am-241; radioactivity; radionuclide removal; oxidized carbon fabrics; water treatment

Subject

Chemistry and Materials Science, Other

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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