Adsorption Kinetic Study for Removal of Heavy Metal from Aqueous Solution by Natural Adsorbent
This paper mainly aims at removing the presence of toxic heavy metals (chromium (VI) and manganese (II)) from wastewater by means of activated carbon, that are acquired from palm kernel under suitable conditions depending on contact time, adsorbent amount, temperature, initial concentration and pH. Equilibrium adsorption models are applied to estimate the thermodynamic and kinetic parameters whereas the isotherm Langmuir and Freundlich models confirms the experimental data. Adsorption rate constant was determined from Lagergren equation and pseudo-second order equations. The sorption ions of chromium (VI) and manganese (II) onto palm kernel was strongly adsorbed dependent on contact time, initial chromium (VI) and manganese (II) concentration, adsorbent dosage, temperature and pH value. thermodynamic parameters can be stated as, negative ΔG° and positive ΔS° shows that the adsorption of Cr (VI) and Mn (II) ions onto palm kernel is a spontaneous process and positive ΔH° indicates that the adsorption is endothermic in nature. Finally, it can be seen that the pseudo-second order equation provided the best correlation coefficient (R2) for the adsorption data.
Adsorption, Palm kernel, Carbon, Langmuir model and heavy metals, Thermodynamic