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Title
Reactive Red 3 and Direct Brown 95 dyes adsorption onto chitosan
Authors
MAURUSA-ELENA IGNAT VIORICA DULMAN TINCA ONOFREI
Received
March 6, 2012
Published
Volume 46 Issue 5-6 June-July
Keywords
adsorption isotherm, adsorption kinetics, chitosan, direct dye, reactive dye
Abstract
The chitosan availability in adsorption of C.I. Reactive Red 3-18159 (RR-3) and C.I. Direct Brown 95-30145 (DB-95)
dyes from aqueous solutions was investigated by using the batch method. Experiments were carried out as a function of
contact time, dye concentrations and temperature. The influence of pH and sodium chloride concentration were also
investigated. The adsorption parameters were determined based on Langmuir and Freundlich isotherms obtained from
the equilibrium adsorption data for the reactive dye and for the direct dye, while the kinetic and thermodynamic
parameters were used to establish the adsorption mechanism. As an adsorbent, chitosan was found to prefer the RR-3
dye, retaining up to 151.52 mg textile dye per gram at 20 °C, whereas a retention of only 41.84 mg textile dye per gram
at 50 °C has been achieved for DB-95 dye.
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