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Title
Equilibrium studies of the removal of Acid Green 9 dye from aqueous solutions by chitosan adsorbent: Batch studies
Authors
DOINA ASANDEI VIORICA DULMAN TATIANA TODORCIUC and ELENA BOBU
Received
May 30, 2012
Published
Volume 47 Issue 9-10 October-December
Keywords
Acid Green 9, chitosan, adsorbent, isotherms, cationic polymer
Abstract
Chitosan is a natural, renewable, nontoxic and biodegradable polymer. This unique natural cationic polymer has been
evaluated as adsorbent for removing Acid Green 9 (AG9) dye from aqueous solutions. The experiments were
performed in a batch system, at room temperature (20 ± 0.5 °C) and the effects of various experimental parameters (pH,
contact time, initial dye concentration, adsorbent dosage, temperature, ionic strength) on adsorption capacity were
investigated. The results have shown the effectiveness of dye removal is mainly dependent on the ratio between initial
concentration of AG9 and chitosan dosage. At a given ratio of AG9: chitosan, an acid pH range of 4-6 was identified as
optimal for dye removal. The temperature raising and presence of sodium sulphate (Na2SO4) resulted in a decrease of
adsorption yield. The experimental data were analyzed for possible agreement with the Langmuir, Freundlich and
Temkin isotherm equations. The Langmuir model was demonstrated to provide the best correlation with the
experimental data.
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