Research Article
Comparative Study on the Adsorption Kinetics and Thermodynamics of Metal Ions onto Acid Activated Low Cost Pandanus Carbon
R. SUDHA, K. KALPANA, T. RAJACHANDRASEKAR and S. ARIVOLI
ABSTRACT
Batch experiments were
carried out for the sorption of Copper and Ferrous ions onto acid activated
carbon prepared. The operating variables studied were initial metal ion
concentration, pH, and temperature and contact time. The equilibrium data were
fitted to the Langmuir and Freundlich isotherm equations. From this adsorption
efficiency, adsorption energy, adsorption capacity, intensity of adsorption and
dimensionless separation factor were calculated. From the kinetic studies the rate constant
values for the adsorption process was calculated. From the effect of
temperature thermodynamic parameters like ∆G°, ∆H°, and ∆S° were calculated.
The mechanism of adsorption for metal ions onto carbon was investigated by
using the experimental results and confirmed by FT- IR, XRD and SEM images.
Received 4 January 2007; Revised 13 February 2007; Accepted 22 February 2007