Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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The effect of UV-C irradiation and EDTA on the uptake of Co2+ by antimony oxide in the presence and absence of competing cations Ca2+ and Ni2+

  • Malinen, Leena (Department of Chemistry, Radiochemistry Unit, University of Helsinki) ;
  • Repo, Eveliina (Department of Separation Science, School of Engineering Science, LUT University) ;
  • Harjula, Risto (Department of Chemistry, Radiochemistry Unit, University of Helsinki) ;
  • Huittinen, Nina (Helmholtz-Zentrum Dresden - Rossendorf, Institute of Resource Ecology)
  • Received : 2021.06.19
  • Accepted : 2021.08.02
  • Published : 2022.02.25
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Abstract

In nuclear power plants and other nuclear facilities the removal of cobalt from radioactive liquid waste is needed to reduce the radioactivity concentration in effluents. In liquid wastes containing strong organic complexing agents such as EDTA cobalt removal can be problematic due to the high stability of the Co-EDTA complex. In this study, the removal of cobalt from NaNO3 solutions using antimony oxide (Sb2O3) synthesized from potassium hexahydroxoantimonate was investigated in the absence and presence of EDTA. The uptake studies on the ion exchange material were conducted both in the dark (absence of UV-light) and under UV-C irradiation. Ca2+ or Ni2+ were included in the experiments as competing cations to test the selectivity of the ion exchanger. Results show that UV-C irradiation noticeably enhances the cobalt sorption efficiency on the antimony oxide. It was shown that nickel decreased the sorption of cobalt to a higher extent than calcium. Finally, the sorption data collected for Co2+ on antimony oxide was modeled using six different isotherm models. The Sips model was found to be the most suitable model to describe the sorption process. The Dubinin-Radushkevich model was further used to calculate the adsorption energy, which was found to be 6.2 kJ mol-1.

Keywords

Acknowledgement

This work was supported by the Jenny and Antti Wihuri Foundation [2015] and the Fortum Foundation [201500073, 2016]. Anna-Elina Pasi, M. Sc. and Taneli Iso-Markku, M. Sc., are thanked for the assistance with the laboratory experiments. Liisa Puro, Ph.D., is thanked for the surface area and pore size analysis. Prof. Jukka Lehto is thanked for constructive discussions throughout the course of the project.

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