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The Influence of Aqueous Ionic, Condition on the Adsorption Features of Fluoride Ion on Waste Oyster Shell  

Lee, Jin-Sook (Department of Environmental Science and Engineering, Ewha Womans University)
Kim, Dong-Su (Department of Environmental Science and Engineering, Ewha Womans University)
Publication Information
Journal of Korean Society on Water Environment / v.23, no.3, 2007 , pp. 314-318 More about this Journal
Abstract
The feasibility of the employment of waste oyster shell as an adsorbent for fluoride ion has been tested by considering the effect ionic condition on the adsorption of fluoride ion on oyster shell. The adsorption capacity of oyster shell for fluoride ion was found not to be significantly influenced by the ionic strength of aqueous environment. The existence of complexing agent such as nitrilotriacetic acid in wastewater decreased the adsorbed amount of fluoride ion by forming a stable complex of $CaT^-$ and the adsorption reaction of fluoride ion on oyster shell was examined to be endothermic. The coexisting heavy metal ionic adsorbate in wastewater hindered the adsorption of fluoride ion, however, its adsorbed amount was increased as the particulate size of adsorbent was decreased. Finally, a serial adsorption column test has been conducted for a practical application of adsorption process and the breakthrough of the column adsorption was observed in 22 hours under the experimental condition.
Keywords
Adsorbent; Column test; Fluoride Ion; Ionic condition; Waste oyster shell;
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