KINETICS, EQUILIBRIUM STUDIES ON REMOVAL OF IONIC DYES USING A NOVEL NONCONVENTIONAL ACTIVATED CARBON

Abstract

The feasibility of activated carbon prepared from Euphorbia Tirucalli wood using H3PO4 for the removal of Malachite Green (Cationic) and Direct
Blue (Anionic) dyes was investigated. The effects of initial dye concentration, contact time, pH and temperature onto ETAC were studied.
Equilibrium isotherms and kinetics were investigated and the experimental data fitted well with the Langmuir model. The maximum monolayer
adsorption capacities of ETAC were found to be 181.81 mg/g and 138.88 mg/g for MG and DB respectively. The kinetic data obtained were analyzed
using pseudo-first order, pseudo-second order and intra particle diffusion models. Thermodynamic parameters were evaluated and suggesting the
spontaneous and endothermic nature of physisorption. Activation energy for the adsorption of MG and DB were 12.1402 kJ/mole and 28.8484
kJ/mole