Abstract
The adsorption of methyl orange(MO) on chitosan(CS) beads in aqueous solutions was investigated by a batch equilibration technique. Special emphasis was focused on the effect of sorbent concentration(c s) on the adsorption equilibration of MO on CS beads. An obvious c s-effect was observed in the adsorption equilibration, i.e., the adsorption amount(Γ) was declined with c s increase. The classical Langmuir model adequately described the adsorption isotherm for each given c s. However, it could not be used to predict the c s-effect observed. The applicability of the Langmuir-SCA isotherm, a surface component activity(SCA) model equation, to fit the c s-effect data was examined. In the SCA model, the activity coefficient of sorbent surface sites, \(f_{H_2 O}^s \), was assumed to be a function of c s due to the deviation of a real adsorption system from an ideal one, arisen from sorbent particle-particle interactions in real systems. The results show that the Langmuir-SCA isotherm could accurately describe the c s-effect observed under the studied conditions. Furthermore, the effects of temperature(t), pH, and electrolyte(NaNO3) concentration(\(c_{NaNO_3 } \)) on \(f_{H_2 O}^s \) were examined. The results show that \(f_{H_2 O}^s \) clearly decreased with increasing t(20–35 °C) and pH(5–8), but no obvious change in \(f_{H_2 O}^s \) was observed as \(c_{NaNO_3 } \) varied in a range 0.001–0.010 mol/L. These results give a better understanding of the c s-effect.
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Supported by the National Natural Science Foundation of China(Nos.21173135, 51372141) and the Specialized Research Fund for the Doctoral Program of Higher Education of China(No.20110131130008).
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Guo, Y., Hou, W., Liang, J. et al. Sorbent concentration effect on adsorption of methyl orange on chitosan beads in aqueous solutions. Chem. Res. Chin. Univ. 30, 837–843 (2014). https://doi.org/10.1007/s40242-014-4042-x
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DOI: https://doi.org/10.1007/s40242-014-4042-x