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http://dx.doi.org/10.11614/KSL.2016.49.4.289

Effect of Particle Size of Sediment on Adsorption of Fluoride  

Kim, Chae-Lim (Department of Applied Environmental Science, KyungHee University)
Oh, Jong-Min (Environmental Science and Engineering, KyungHee University)
Publication Information
Korean Journal of Ecology and Environment / v.49, no.4, 2016 , pp. 289-295 More about this Journal
Abstract
The purpose of this study is to find out the effect of particle size of sediment on adsorption of fluoride. Particle size is classified as sand, silt and clay. Adsorption equilibrium time, adsorption isotherms and the effect of pH were investigated through batch tests. The $pH_{pzc}$ of sand, silt, clay was respectively 6, 8, 4.5 and AEC (anion exchange capacity) was highest in silt, respectively 0.0095, 0.0224, $0.014meq\;g^{-1}$. Adsorption of fluoride on the sediment was in equilibrium within 300 minutes from all particle size. The experimental data of isotherms at various pH were well explained by Freundlich equation. As the experimental results of the effect of pH, the adsorption efficiency of sand and silt were reduced after the $pH_{pzc}$. However, the adsorption efficiency of clay was maintained after the $pH_{pzc}$, and decreased rapidly higher than pH 12.
Keywords
fluoride; adsorption; sediment; pH; AEC;
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