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http://dx.doi.org/10.4491/KSEE.2011.33.11.804

Applicability of Theoretical Adsorption Models for Studies on Adsorption Properties of Adsorbents(II)  

Na, Choon-Ki (Department of Environmental Engineering, Mokpo National University)
Park, Hyun-Ju (Department of Civil and Environmental Engineering, Seoul National University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.33, no.11, 2011 , pp. 804-811 More about this Journal
Abstract
The aim of this study is to evaluate the applicability of adsorption models for understanding adsorption properties of adsorbents. For this study, the adsorption charateristics of $NO_3^-$ by commercial anion exchange resin, PA-308, were investigated in bach process. The adsorption kinetic data for $NO_3^-$ by anion exchange resin showed two stage process comprising a fast initial adsorption process and a slower second adsorption process. Both the pseudo-first-order kinetic model and the pseudo-second-order kinetic model could not be used to predict the adsorption kinetics of $NO_3^-$ onto anion exchange resin for the entire sorption period. Only the fast initial portion ($t{\leq}20min$) of adsorption kinetics was found to follow pseudo-first-order kinetic model and controlled mainly by external diffusion that is very fast and high, whereas, the slower second portion (t > 20 min) of adsorption kinetics seems to be controlled by a second-order chemical reaction and by intraparticle diffusion.
Keywords
Sorption Equilibrium; Kinetics; Diffusion Model; Anion Exchange; Nitrate Nitrogen;
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Times Cited By KSCI : 2  (Citation Analysis)
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