Adsorption of Reactive Red 2 Dye onto Activated Carbon Prepared from Hazelnut Shells

Abstract

The prepared activated carbon from hazelnut shells (HS) was used to remove the
reactive red 2 dye (RR 2) from aqueous solutions, the adsorption behavior of dye onto the
porous carbon was studied by varying parameters such as different doses, pH, contact
time and temperature. The amounts of reactive red 2 dye adsorbed increased with an
increased temperature. Adsorption isotherms of reactive red 2 dyes on activated carbon
were determined and correlated with common isotherms equations. It was found that the
Langmuir and Freundlich model appears to fit the isotherm data. The maximum
adsorption capacity of dye was 8.67 mg/g at 45 oC and pH 3. The thermodynamic
parameters (ΔGo, ΔHo, ΔSo) were also determined from the temperature dependence, the
results showed that the process of adsorption reactive red 2 dye was spontaneous and
endothermic process and an increase in temperature favored the adsorption.