Removal of cobalt from aqueous solution containing EDTA under UV-C irradiation by antimony oxide
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Leena Malinen
,
Risto Koivula
Abstract
Antimony oxide was synthesized by a simple method involving the mixing of 6 M HCl and antimony pentachloride, adjusting the synthesis pH with 25% ammonia. The obtained material was characterized using X-ray diffraction, field emission scanning electron microscopy, and surface area and pore size analysis. The material structure resembled that of Sb6O13. The cobalt sorption efficiency of the synthesized antimony oxide was tested in the dark and under UV-C irradiation. The 0.01 M NaNO3 test solution contained varying concentrations of Co2+ and EDTA and was traced with 57Co. The cobalt concentration in the solutions was determined by gamma spectroscopy. The synthesized material proved to have a high cobalt uptake. In the presence of 20 μM EDTA, 99.7% of cobalt was removed from the solution after 2 h of UV-C irradiation.
Supplementary material
the online version of this article (DOI: 10.1515/ract-2015-2501) provides supplementary material for authorized users.
Acknowledgement
The author is grateful to Fortum Foundation for financial support. Sanna Kantola, B.Sc., is thanked for assistance with the laboratory experiments. Eveliina Repo, PhD, is thanked for the surface area and pore size analysis.
©2016 Walter de Gruyter Berlin/Boston
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