The Lagergren's pseudo-first-order model (Eq. (3)) and pseudosecond-order
model (Eq. (4)) [27] have been widely used to predict
sorption kinetics. The pseudo-second-order equation predicts the
behavior over the whole range of adsorption whereas the pseudo-
first-order equation is generally applicable to the initial stage of the
adsorption processes. Both these models were used to fit the experimental
data of this study.