"EVALUATION OF OPUNTIA FICUS INDICA AS AN ECONOMIC ADSORBENT FOR ANIONIC RED BEMACID DYE FROM AQUEOUS SOLUTION "

Author:

FEKAOUNI AIDA, ,HENINI GHANIA,LAIDANI YKHLEF, , ,

Abstract

Opuntia ficus indica cladodes (OFIC) were used as an adsorbent for the removal of anionic Bemacid Red (RB) dye from an aqueous solution. The study was performed in a batch reactor under different experimental conditions. The adsorption process was very fast during the first 60 min of phases’ contact at 25 °C, the adsorbent being characterized by an adsorption capacity of 16.721 mg/g at pH 2. The experimental data fitted very well with the pseudo-second-order kinetic model (R2 = 0.994), and the Langmuir, Freundlich, Temkin and Dubinin-Radushkevich adsorption models were applied to describe the adsorption equilibrium isotherms. The thermodynamic parameters: enthalpy (-20.739 kJ/mol), entropy (-0.226 kJ/K.mol) and the Gibbs free energy (-14 to -13.557 kJ/mol) were determined over the selected temperature range (25 to 45 °C). The adsorption using the studied system (OFI cladodes/RB) proved to be an exothermic and spontaneous process.

Publisher

Institutul de Chimie Macromoleculara Petru Poni

Subject

Materials Chemistry,Organic Chemistry

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