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Adsorption Characterization of Cd by Activated Carbon containing Hydroxyapatite using Response Surface Methodology (RSM)  

An, Sang-Woo (Department of Civil and Environmental Engineering, Hanyang University)
Yoo, Ji-Young (Department of Civil and Environmental Engineering, Hanyang University)
Choi, Jae-Young (Korea Institute of Science and Technology, Gangneung Branch)
Park, Jae-Woo (Department of Civil and Environmental Engineering, Hanyang University)
Publication Information
Journal of Korean Society on Water Environment / v.25, no.6, 2009 , pp. 943-950 More about this Journal
Abstract
Cadmium (Cd) adsorption onto the activated carbon containing hydroxyapatite (HAP) was investigated in batch experiments and response surface methodology (RSM) using the Box-Behnken methods were applied to the experimental results. Cd adsorption with different HAP mass ratio of from 10% to 30%. With more HAP, Cd was more adsorbed. These results suggest that the higher HAP mass causes an increase of the ion exchange potential of the HAP sorbent. Equilibrium experimental results from Cd adsorption was fitted to Langmuir and Freundlich isotherm models. Cd adsorption on HAP sorbent were found to follow the Freundlich isotherm model well in the initial adsorbate concentration range. Also, Cd adsorption was a function of the HAP mass ratio ($x_1$), initial Cd concentration ($x_2$), and initial pH ($x_3$) from the application of the RSM. Statistical results showed the order of significance of the independent variables to be initial Cd concentration > HAP mass ratio > initial pH.
Keywords
Activated carbon; Adsoption; Cadimium; Hydroxyapatite; Response surface methodology;
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Times Cited By KSCI : 8  (Citation Analysis)
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