3 research outputs found
Lead removal from wastewater using fluted pumpkin seed shell activated carbon: Adsorption modeling and kinetics
Activated carbon produced from fluted pumpkin (Telfairia occidentalis)
seed shell was utilized for the removal of lead (II) ion from simulated
wastewater. Adsorption tests were carried out in series of batch
adsorption experiments. Several kinetic models
(Bhattacharya-Venkobacher, Elovich, pseudo first and second order,
intra-particle and film diffusion) were tasted for conformity to the
experimental data obtained. The Langmuir and Freundlich adsorption
models were also used to test the data. The amount of lead (II) ion
adsorbed at equilibrium from a 200 mg/L solute concentration was 14.286
mg/g. The experimental data conform very well to the pseudo-second
order equation where equilibrium adsorption capacities increased with
increasing initial lead (II) concentration. The rate of the adsorption
process was controlled by the film (boundary layer) diffusion as the
film diffusion co-efficient values obtained from data analysis were of
the order of 106cm2/s. From the plots, the linear regression
coefficient (R2) of the Langmuir model was higher than that of the
Freundlich: the adsorption isotherm obeyed the Langmuir model better
than the Freundlich model