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http://dx.doi.org/10.17137/Korrae.2014.22.2.17

Adsorption characteristics of synthetic heavy metals ($Zn^{2+}$, $Ni^{2+}$, $Cd^{2+}$, $Cu^{2+}$, and $Pb^{2+}$) by bentonite  

Shin, Woo-Seok (Institute of Marine Science and Technology Research, Hankyong National University)
Kim, Young-Kee (Department of Chemical Engineering, Hankyong National University)
Publication Information
Journal of the Korea Organic Resources Recycling Association / v.22, no.2, 2014 , pp. 17-26 More about this Journal
Abstract
In this study, the adsorption efficiency of mixed heavy metals from an aqueous solution was examined using bentonite. The physical and chemical properties of bentonite was analyzed via scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR), Further, heavy metal adsorption was characterized using Freundlich and Langmuir equations. Equilibrium adsorption data were fitted well to the Langmuir model for bentonite. The adsorption uptake of heavy metals was high and followed the order $Pb^{2+}$ > $Cu^{2+}$ > $Cd^{2+}$ > $$Zn^{2+}{\sim_=}Ni^{2+}$$. The results also showed that adsorption uptake slightly increased as increasing pH from 6 to 10. The bentonite surface was observed viay SEM and FT-IR; Si-O and Si-O-Al were found to be the main functional groups by FT-IR analysis. From these results, the adsorption mechanisms of heavy metal were not only surface adsorption and ion exchange, but also surface precipitation. Thus, bentonite could be a useful adsorbent for treating heavy metal in aqueous solution.
Keywords
Bentonite; Mixed Heavy Metal; Adsroption; Capping Material; Sediment;
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Times Cited By KSCI : 3  (Citation Analysis)
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