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http://dx.doi.org/10.14481/jkges.2011.12.7.5

Removal Characteristics of Cd and Pb by Adsorption on Red Mud  

Yim, Soobin (경성대학교 환경공학과)
Kim, Jaegon (한국지질자원연구원 지질재해연구실)
Song, Hocheol (세종대학교 환경에너지융합학과)
Publication Information
Journal of the Korean GEO-environmental Society / v.12, no.7, 2011 , pp. 39-47 More about this Journal
Abstract
The objective of this study is to investigate the removal characteristics of cadmium(Cd) and lead(Pb) by adsorption on red mud and to study the adsorption characteristics of Cd and Pb using red mud activated by acid treatment and calcination. The adsorption of Cd and Pb on red mud was significantly achieved within 1hour and equilibrated after 5 hours. The adsorption capacity of Cd and Pb on red mud increased with increasing pH. The neutralization of red mud by distilled water or acid and the activation of red mud by acid treatment or calcination decreased the adsorption capacity of Cd and Pb on red mud, suggesting that Cd and Pb could be effectively eliminated by adsorption on red mud without any pretreatment or modification. Both Langmuir and Freundlich models were successfully applied to describe the adsorption behavior of Cd and Pb on red mud. The $q_m$ of Langmuir adsorption model and $K_F$ of Freundlich adsorption model were 5.230mg/g and 1.118mg/g for Cd and 22.222mg/g and 7.241mg/g for Pb, respectively.
Keywords
Red mud; Cadmium; Lead; Adsorption; Activation;
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