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Title
Agricultural waste corn cob as a sorbent for removing reactive dye Orange 16: Equilibrium and kinetic study
Authors
Daniela Suteu Teodor Malutan and Doina Bilba
Received
March 5, 2010
Published
Volume 45 Issue 5-6 May-June
Keywords
corn cob, reactive dye Orange 16, sorption, equilibrium, kinetics, thermodynamic, aqueous
Abstract
The potential of corn cob, a natural low-cost lignocellulosic material, was investigated for the removal of reactive dye Orange 16 from an aqueous solution. Sorption isotherms were determined at 3 temperatures (5, 18 and 45 °C), in solutions with initial dye concentrations in the 37.05-370.5 mg L-1 range. The equilibrium data were analyzed using Langmuir, Freundlich, Dubinin-Radushkevich and Tempkin isotherm models. The sorption equilibrium process was described well by the Langmuir isotherm model. According to the Langmuir isotherm, the maximum sorption capacity was estimated as 25.25 mg g-1 (18 °C). The values of the mean free energy determined with the Dubinin-Radushkevich equation (9.713 kJ mol-1 at 18 °C, as well as the thermodynamic parameters suggest that the mechanism of reactive dye sorption onto corn cob is a combination of electrostatic interactions and physical sorption. The kinetic data were studied in terms of pseudo-first and pseudo-second order kinetic models.
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