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Adsorption of Acid Blue 260 from Aqueous Solutions onto Multi-Wall Carbon Nanotube: Determination of Equilibrium, Thermodynamics Parameters by Linear and Non-linear Regression

M. Shabani* and F. Azizinezhad

Department of Chemistry, Islamic Azad University, Varamin-Pishva Branch, Varamin, Iran

*Corresponding author: Fax: +98 213 6725002; Tel: +98 213 6725011; E-mail: mshabani45@yahoo.com
Abstract

This study examined the feasibility of removing acid blue 260, an acidic dye, from aqueous solutions using multi-wall carbon nanotube (MWCNTs). The dye adsorption experiments were carried out by using batch procedure. The effects of contact time, pH, dye concentration, adsorbent dose and temperature on adsorption of acid blue 260 by MWCNTs was also evaluated. This study used four two-parameter isotherms and six three-parameter isotherms. The equilibrium data were then analyzed using linear regression and one non-linear error analysis method. Experimental results have shown that the acidic pH (6.4), favoured the adsorption. The dye adsorption equilibrium was attained after 75 min of contact time. The capacity of MWCNTs to adsorb acid blue 260 was 233.34 mg/g in 298 K. The adsorption amount of acid blue 260, qe (mg/g), increased as dye concentration and temperature increased. The equilibrium adsorption of acid blue 260 is best fitted in the linear regression Dubinin-Radushkevich isotherm at 298 K and non-linear regression Koble-Corigan model is best fitted at 308 and 318 K. For acid blue 260, enthalpy (ΔH°) and entropy (ΔS°) were 31.361 kJ/mol and 131.74 J/mol K, respectively.
Keywords

Adsorption, Acid blue 260, Multi-wall carbon nanotube, Isotherms, Thermodynamics.
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