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http://dx.doi.org/10.7745/KJSSF.2013.46.1.008

Adsorption Characteristics of Heavy Metals using Sesame Waste Biochar  

Choi, Ik-Won (Department of Bio-Environmental Sciences, Sunchon National University)
Seo, Dong-Cheol (Department of Bio-Environmental Sciences, Sunchon National University)
Kang, Se-Won (Department of Bio-Environmental Sciences, Sunchon National University)
Lee, Sang-Gyu (Department of Bio-Environmental Sciences, Sunchon National University)
Seo, Young-Jin (Department of Bio-Environmental Sciences, Sunchon National University)
Lim, Byung-Jin (Yeongsan River Environmental Research Center)
Heo, Jong-Soo (Division of Applied Life Science (BK21 program) & Institute of Agriculture and Life Science, Gyeongsang National University)
Cho, Ju-Sik (Department of Bio-Environmental Sciences, Sunchon National University)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.46, no.1, 2013 , pp. 8-15 More about this Journal
Abstract
Little research has been conducted to explore the heavy metal removal potential of biochar. The adsorption characteristics of heavy metals by sesame waste biochar (pyrolysis at $600^{\circ}C$ for 1 hour) as heavy metal absorbent were investigated. The sesame waste biochar was characterized by SEM-EDS and FT-IR, and heavy metal removal was studied using Freundlich and Langmuir equations. The removal rates of heavy metals were higher in the order of Pb>Cu>Cd>Zn, showing that the adsorption efficiency of Pb was higher than those of any other heavy metals. Freundlich and Langmuir adsorption isotherms were used to model the equilibrium adsorption data obtained for adsorption of heavy metals on biochar produced from sesame waste. Pb, Cu, Cd and Zn equilibrium adsorption data were fitted well to the two models, but Pb gave a better fit to Langmuir model. Heavy metals were observed on the biochar surface after adsorption by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). Main functional groups were aromatic C=O ring (at $1160cm^{-1}$, $1384cm^{-1}$ and $1621cm^{-1}$) by FT-IR analysis. Thus, biochar produced from sesame waste could be useful adsorbent for treating heavy metal wastewaters.
Keywords
Biochar; Sesame waste; Heavy metals; Adsorption;
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