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http://dx.doi.org/10.5394/KINPR.2015.39.3.185

Characteristics of Stabilization and Adsorption of Heavy Metal (As3+, Cr6+) by Modified Activated Carbon  

Shin, Woo-Seok (Institute of Marine Science and Technology Research, Hankyong National University)
Na, Kyu-Ri (Institute of Marine Science and Technology Research, Hankyong National University)
Kim, Young-Kee (Department of Chemical Engineering, Hankyong Natinal University)
Abstract
In this study, the adsorption efficiency of mixed heavy metals in aqueous solution was investigated using modified activated carbon. Moreover, the heavy-metal stabilization treatment of contaminated marine sediment was achieved using modified activated carbon as stabilizing agents. From the experimental results, it was shown that the adsorption equilibrium was attained after 120 mins. Heavy metal adsorption was characterized using Freundlich and Langmuir equations. The equilibrium adsorption data were fitted well to the Langmuir model in modified activated carbon. The adsorption uptake of $As^{3+}$ (28.47 mg/g) was higher than $Cr^{6+}$ (13.28 mg/g). In case of the $Cr^{6+}$, the results showed that adsorption uptake decreased with increasing pH from 6 to 10. However, adsorption of $As^{3+}$ slightly increased in the increasing change of pH. The modified activated carbon was applied for a wet-curing duration of 120 days. From the sequential extraction results, the exchangeable, carbonate, and oxides fractions of Cr and As in sediment decreased by 5.8% and 7.6%, respectively.
Keywords
Modified activated carbon; Heavy metals; Adsorption; Stabilization; Marine contaminated sediment;
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