where k2 (g/mg h) is the PSO rate constant. The batch kinetic
data were fitted to these two models by nonlinear methods
and the fitting of the kinetic data at 30 ◦C is shown in Fig. 8.
Based on the highest adjusted correlation coefficient (R2
adj) values
which approached unity, the PSO model was the most suitable in
describing the adsorption kinetics of 2,4-D on CCAC at all initial
concentrations of 2,4-D and temperatures studied. The applicability
of the PSO model to describe the adsorption process was further
validated by the root-mean squared error (RMSE) obtained which