Sorption of Pb(II) and Cd(II) ions onto chemically unmodified and modified oil palm, fruit fibre adsorbent: Analysis of pseudo second order kinetic models

This study examines the sorption kinetics of Pb (II) and Cd (II) ions from aqueous solutions using unmodified and chemically modified oil palm fruit fibre. Four different models of the pseudo-second order equation were used to characterize the metal ion sorption kinetics. The results indicate that different kinetic parameters were obtained from the four forms of the pseudo-second order equations. The chemical modification of the adsorbent increased the equilibrium sorption capacity with maximum values of 5.579 mg/g for Pb(II) and 7.980 mg/g for Cd(II) for the 1.0 MOPF adsorbents. The coefficient of determination (r²) was used to analyse the different pseudo second order equations with the best fit for each of the different metal ions.