Adsorption thermodynamic treatment of textile effluent using activated carbon made from palm kennel husk

Abstract

Activated carbon prepared from Palm kennel husk treated with Zinc chloride and steam was used to treat textile effluent. Metal reduction from textile effluent was found to be decrease with increase in temperature with maximal removal of Zn (98.9%), Cu (97.6%), Cr (93.3%) Cd (95.2%) and Pb (97.6%). The adsorption mechanism is modelled by Langmuir and Freundlich isotherms. The
adsorption capacity of Langmuir and Freundlich decreased with temperature. The intensity of adsorption (1/n) defined by Freundlich isotherm is greater than 1 in all the cases, which predicted favourability of the processes. Various thermodynamic parameters, such as ∆GO, ∆HO, ∆SO and Ea have been calculated. The data showed that the adsorption process is spontaneous and exothermic in
nature and that lower solution temperatures favour ion removal by the activated carbon.