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Competitive Adsorption Characteristics of Rapid Cooling Slag in Single- and Multi-Metal Solutions
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Competitive Adsorption Characteristics of Rapid Cooling Slag in Single- and Multi-Metal Solutions
Park, Jong-Hwan; Kim, Hong-Chul; Kim, Seong-Heon; Lee, Seong-Tae; Kang, Byung-Hwa; Kang, Se-Won; Seo, Dong-Cheol;
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BACKGROUND: Heavy metal adsorption not only depends on rapid cooling slag(RCS) characteristics but also on the nature of the metals involved and on their competitive behavior for RCS adsorption sites. The goal of this study was to investigate the competitive absorption characteristics of Cu, Cd and Zn in single- and multi-metal forms by RCS.METHODS AND RESULTS: Both single- and multi-metal adsorption experiments were conducted to determine the adsorption characteristics of RCS for the heavy metals. Adsorption behaviors of the heavy metals by RCS were evaluated using both the Freundlich and Langmuir adsorption isotherm equations. The maximum adsorption capacities of metals by RCS were in the order of Cu(16.6 mg/g) > Cd(8.1 mg/g) > Zn(6.2 mg/g) in the single-metal adsorption isotherm and Cu(14.5 mg/g) >> Zn(1.3 mg/g) > Cd(0.6 mg/g) in the multi-metal adsorption isotherm. Based on data obtained from Freundlich and Langmuir adsorption models and three-dimensional simulation, multi-metal adsorption behaviors differed from single- metal adsorption due to competition. Cadmium and Zn were easily exchanged and substituted by Cu during multi-metal adsorption.CONCLUSION: Results from adsorption experiments indicate that competitive adsorption among metals increases the mobility of these metals.
Competitive adsorption;Heavy metal;Langmuir isotherm;Rapid cooling slag;Three-dimension simulation;
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