Sorbent Concentration Effect on Adsorption of Methyl Orange on Chitosan Beads in Aqueous Solutions

doi:10.1007/s40242-014-4042-x

Abstract

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,ƒ_H₂O^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_NaNO₃) on ƒ_H₂O^s were examined. The results show that ƒ_H₂O^s clearly decreased with increasing t(20-35℃) and pH(5-8), but no obvious change in ƒ_H₂O^s was observed as c_NaNO₃ varied in a range 0.001-0.010 mol/L. These results give a better understanding of the c_s-effect.

Key words: Chitosan, Methyl orange, Adsorption, Sorbent concentration effect, Adsorption site activity coefficient

GUO Yali, HOU Wanguo, LIANG Jiling, LIU Jianqiang. Sorbent Concentration Effect on Adsorption of Methyl Orange on Chitosan Beads in Aqueous Solutions[J]. Chemical Research in Chinese Universities, 2014, 30(5): 837-843.

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