EQUILIBRIUM AND KINETIC STUDIES ON ADSORPTION OF ANILINE BLUE FROM AQUEOUS SOLUTION ONTO RICE HUSK CARBON

Abstract

Equilibrium and kinetic studies on the adsorption of Aniline Blue dye from aqueous solution onto activated rice husk carbon have been reported.
The rice husk carbon has been characterized for its specific surface area, XRD and TEM analysis. The effects of dye initial concentration, adsorbent‐
adsorbate contact time and temperature on the percent adsorption of the dye on the adsorbent have been investigated. Kinetics of adsorption of
Aniline blue onto the adsorbent in aqueous solution was monitored, spectro‐photometrically. At the given dye initial concentration, % adsorption
of dye increases with increase in temperature as well as the contact period. However, at the given temperature, % adsorption of the dye decreases
with the increase in dye initial concentration. The observed data was analyzed in the light of Langmuir and Freundlich adsorption isotherms. Dye
adsorption rate constant (kad) follows the first order kinetics. Activation energy (Ea) of adsorption, intra‐particle diffusion rate constant and
thermodynamic parameters of adsorption of the dye on the rice‐husk carbon have been evaluated and interpreted.