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http://dx.doi.org/10.11001/jksww.2019.33.3.205

Applicability of adsorption kinetic model for cation/anion for chitosan hydrogel bead  

An, Byungryul (Department of Civil Engineering, Sangmyung University)
Publication Information
Journal of Korean Society of Water and Wastewater / v.33, no.3, 2019 , pp. 205-213 More about this Journal
Abstract
Batch adsorption tests were performed to evaluate the applicability of adsorption kinetic model by using hydrogel chitosan bead crosslinked with glutaraldehyde (HCB-G) for Cu(II) as cation and/or phosphate as anion. Pseudo first and second order model were applied to determine the sorption kinetic property and intraparticle and Boyd equation were used to predict the diffusion of Cu(II) and phosphate at pore and boundary-layer, respectively. According to the value of theoretical and experimental uptake of Cu(II) and phosphate, pseudo second order is more suitable. On comparison with the value of adsorption rate constant (k), phosphate kinetic was 2-4 times faster than that of Cu(II) at any experimental condition indicating the electrostatic interaction between ${NH_3}^+$ and phosphate is dominated at the presence of single component. However, when Cu(II) and phosphate simultaneously exist, the value of k for phosphate was sharply decreased and then the difference was not significant. Both diffusion models confirmed that the sorption rate was controlled by film mass transfer at the beginning time (t < 3 hr) and pore diffusion at next time section (t > 6 hr).
Keywords
Adsorption; Kinetic; Diffusion; Chitosan bead;
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