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Synthesis of Na-A Type Zeolite and Its Ability to Adsorb Heavy Metals  

Chae, Soo-Chun (Korea Institute of Geoscience and Mineral Resources)
Jang, Young-Nam (Korea Institute of Geoscience and Mineral Resources)
Bae, In-Kook (Korea Institute of Geoscience and Mineral Resources)
Lee, Sung-Ki (Korea Institute of Geoscience and Mineral Resources)
Ryou, Kyung-Won (Korea Institute of Geoscience and Mineral Resources)
Publication Information
Journal of the Mineralogical Society of Korea / v.21, no.1, 2008 , pp. 37-44 More about this Journal
Abstract
This study was performed to synthesize Na-A type zeolite with melting slag from the Mapo incineration site and recycle the zeolite as an environmental remediation agent. The melting slag used had a favorable composition containing 26.6% $SiO_2$, 10.9% $Al_2O_3$ and 2.7% $Na_2O$ for zeolite synthesis although there were high contents of iron oxides, including 19.6% $Fe_2O_3$ and 18.9% FeO, which had been used as a flux for the melting. It was confirmed that the Na-A type zeolite could be successfully synthesized at $80^{\circ}C$ and $SiO_2/Al_2O_3\;=\;0.80{\sim}1.96$. The cation exchange capacities (CEC) of the zeolites was determined to be about 220 cmol/kg leveled off at the synthetic time more than 10hrs. The adsorption capacities of zeolite to heavy metals (Cd, Cu, Mn and Pb) were high except for As arid Cr. It was also confirmed through the Eh and pH analysis that As and Cr existed in the forms of $HAsO_4^{2-}$ and $CrO_4^{2-}$. The low absorption rates of zeolite for As and Cr are attributed to the fact that the pore size ($4\;{\AA}$) of Na-A type is smaller than those of $HAsO_4^{2-}$ and $CrO_4^{2-}$ ions ($4\;{\AA}$ ionic radii and $8\;{\AA}$ diameter).
Keywords
Na-A zeolite; adsorption; cation exchange capacity; melting slag; Eh-pH;
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Times Cited By KSCI : 1  (Citation Analysis)
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