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Adsorption Behavior of Pb2+ Ions on Alginate Beads and Capsules  

Shin, Eun Woo (School of Chemical Engineering and Bioengineering, University of Ulsan)
Thuong, Nguyen Thi Lien (School of Chemical Engineering and Bioengineering, University of Ulsan)
Yoo, Ik-Keun (School of Chemical Engineering and Bioengineering, University of Ulsan)
Publication Information
Korean Chemical Engineering Research / v.45, no.2, 2007 , pp. 166-171 More about this Journal
Abstract
The adsorption behavior of $Pb^{2+}$ was compared between calcium alginate beads and capsules, which have different structures of alginate-gel core beads and liquid core alginate-membrane capsules, respectively. In terms of adsorption kinetics and isotherms, adsorption characteristics depending on pH and hardening time were compared for both adsorbents and also released calcium ion during the adsorption process was monitored. The adsorption of $Pb^{2+}$ on both adsorbents was caused by surface complexation and ion exchange mechanisms, both of which have similar effects on adsorption process regardless of the amount of adsorbed $Pb^{2+}$. The dependence of $Pb^{2+}$ adsorption upon pH was also similar for both adsorbents indicating the existence of similar functional groups on the surface of adsorbents. However, a different $Pb^{2+}$ adsorption behavior was observed considering the adsorption kinetics. The adsorption kinetic of $Pb^{2+}$ on alginate beads was slower than on alginate capsules and the maximum adsorption loading ($Q_{max}$) onto alginate beads was also less than onto alginate capsules by 49%. This drawback of alginate beads compared to capsules were ascribed to a diffusion limitation due to solid gel-core structure of alginate beads.
Keywords
Adsorbent; Alginate beads; Alginate Capsules; $Pb^{2+}$ Adsorption;
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