Simultaneous removal of the radiotoxic nuclides Cs-137 and I-129 from aqueous solution

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The simultaneous removal of cationic and anionic radiotoxic nuclides such as Cs-137 and I-129 from radioactive liquid wastes has been studied. As an adsorbent material, the mixture of activated carbon and chabazite zeolite was used. The mixing ratio of 7:3 of activated carbon to chabazite in weight fraction was found to be optimum under the most conservative condition for the Cs+ and I- concentration ratio. Experimental data and surface analysis indicated that Cs+ adsorbed onto the activated carbon surface caused a synergistic effect on the adsorption of I-. The effect of background electrolytes, namely Na+ and Cl-, on the Cs+ isotherm was minute over the whole range of equilibrium concentrations, whereas that on the I- isotherm was greater at lower equilibrium concentrations. A dynamic model was proposed, based on surface diffusion and competitive adsorption. The breakthrough behaviors of Cs+ and I- in the column, charged with the mixed adsorbent, were predicted satisfactorily by the proposed dynamic model. (C) 1997 Elsevier Science B.V.
Publisher
ELSEVIER SCIENCE BV
Issue Date
1997
Language
English
Article Type
Article
Keywords

ACTIVATED CARBON; ADSORPTION; ZEOLITE; URANIUM

Citation

SEPARATION AND PURIFICATION TECHNOLOGY, v.12, no.3, pp.215 - 227

ISSN
1383-5866
DOI
10.1016/S1383-5866(97)00045-2
URI
http://hdl.handle.net/10203/73187
Appears in Collection
NE-Journal Papers(저널논문)
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