期刊
APPLIED RADIATION AND ISOTOPES
卷 64, 期 3, 页码 291-297出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.apradiso.2005.06.016
关键词
Co-60; adsorption; inorganic materials; hydrous oxides; calcined hydrotalcite
The adsorption of radioactive cobalt from aqueous solution on MgO, MnO2, TiO2, SnO, activated carbon and calcined hydrotalcite was studied under static conditions as a function of pH (1, 3, 5, 7, and 10) of the Co-60 solution. It was found that under the experimental conditions, Co-60 was significantly adsorbed on MnO2, TiO2 and activated carbon and in smaller quantities on MgO, SnO and calcined hydrotalcite. The adsorption of Co-60 species on MgO, MnO2, TiO2 and SnO can be attributed to the direct exchange of ions with a specific group on the adsorbing surface, in accordance with the concept of zero point charge (zpc). The radionuclide content was determined by gamma-spectrometry. The Co-60 chemical species present in aqueous solutions with different pH values were surveyed by using high-voltage electrophoresis. It was also found that Co-60 was present only as a cationic species at pH 1, 3, 5 and 7 and a neutral species at alkaline pH. (c) 2005 Elsevier Ltd. All rights reserved.
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