Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 329, Issue 1, Pages 17-23Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2008.09.052
Keywords
Selenium(IV); Silicic acid; Sorption; Competition; Magnetite; Surface complexation model; Radioactive waste repository
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- Andra
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Sorption of selenium(IV) and silicic acid onto magnetite (Fe(3)O(4)) was investigated in binary systems, with concentrations of silicic acid under the solubility limit of amorphous silica. Using the double diffuse layer model (DDLM), surface complexation constants of selenium(IV) and H(4)SiO(4) onto magnetite were extracted using Fiteql 4.0. Then, prediction Curves of the sorption of selenium(IV) in the presence of silicic acid onto magnetite were obtained, using the calculated Surface complexation constants. Finally, laboratory experiments were performed and showed a competition between selenium(IV) and silicic acid for the Surface sites of magnetite. Experimental results matched the model predictions, confirming its ability to model qualitatively and quantitatively the ternary system. (C) 2008 Elsevier Inc. All rights reserved.
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